POINT I/O ASCII Modules 1734-232ASC, 1734-485ASC User Manual
Important User Information Because of the variety of uses for the products described in this publication, those responsible for the application and use of these products must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.
Rockwell Automation Support Before you contact Rockwell Automation for technical assistance, we suggest you please review the troubleshooting information contained in this publication first. If the problem persists, call your local Rockwell Automation representative or contact Rockwell Automation in one of the following ways: Phone Internet United States/Canada 1.440.646.5800 Outside United States/Canada You can access the phone number for your country via the Internet: 1.Go to http://www.ab.com 2.
Preface Purpose of This Manual This manual describes how to install, configure, and troubleshoot your POINT I/O 1734-232ASC module (for the RS-232 network) or 1734-485ASC module (for the RS-485 or RS-422 network). For Information on Who Should Use This Manual See Chapter/ Appendix Installing the ASCII Module 1 Configuring Your ASCII Module 2 Diagnostics 3 Specifications A You must be able to use RSNetWorx for DeviceNet software or similar configuration software to set this module.
Preface 2 Related Products and Documentation The following table lists related POINT I/O products and documentation. Catalog Number Description Communication Adapter DeviceNet Adapter (Cat. No. 1734-ADN) Installation Instructions 1734-IN007 Communication Interface DeviceNet Interface (Cat. No. 1734-PDN) Installation Instructions 1734-IN057 1734D Series 1734D Series 24V dc 8 In/8 Out Combo Module (Cat. No. 1734D-IB8XOB8E, -IB8XOB8ES) Installation Instructions 1734-5.
Preface Catalog Number Description Counter Modules 24V Encoder/Counter Module (Cat. No. 1734-IK) Installation Instructions User Manual 1734-IN006 1734-UM006 5V Encoder/Counter Module (Cat. No. 1734-IJ) Installation Instructions User Manual 1734-IN005P 1734-UM006 24V dc Very High Speed Counter Module (Cat. No. 1734-VHSC24) Installation Instructions User Manual 1734-IN003 1734-UM003 5V dc Very High Speed Counter Module (Cat. No.
Preface 4 Notes: Publication 1734-UM009B-EN-P - July 2003
Table of Contents Chapter 1 Installing the ASCII Module General Information on the ASCII Modules . . . . . . . . . . . . 1-1 Installing the Mounting Base/ Wiring Base Assembly . . . . . 1-1 Installing an I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Installing the Removable Terminal Block . . . . . . . . . . . . . . 1-4 Removing a Mounting Base . . . . . . . . . . . . . . . . . . . . . . . . 1-5 Wiring the 1734-232ASC Module . . . . . . . . . . . . . . . . . . . .
Table of Contents ii Transmit Handshake vs. Transmit Immediate Mode . . . Transmitting Serial Data . . . . . . . . . . . . . . . . . . . . . . . Setting Up the Scanner I/O Transmit Size . . . . . . . . . . Produce Immediate vs. Master/Slave Handshake Mode Explicit Messages to Transmit Serial Data String . . . . . . . . . . 2-24 2-26 2-26 2-27 2-28 Chapter 3 Diagnostics Using the Indicators for Troubleshooting . . . . . . . . . . . . . .
Chapter 1 Installing the ASCII Module General Information on the ASCII Modules The ASCII modules provide a flexible DeviceNet interface to a wide variety of RS-232, RS-485, and RS-422 ASCII devices. The modules provide the communication connections to the ASCII device. The 1734-232ASC module connects to the RS-232 network while the 1734-485ASC module connects to the RS-485 or RS-422 network.
1-2 Installing the ASCII Module 1. Position the mounting base/wiring base assembly vertically above the installed units (adapter, power supply or existing module). Slide-in Writable Label R X TX N N S et t w O at u o D s rk E: M St od at u us le 2. Slide the mounting base down allowing the interlocking side pieces to engage the adjacent module or adapter.
Installing the ASCII Module The module can be installed before, or after base installation. Make sure that the mounting base is correctly keyed before installing the module into the mounting base. In addition, make sure the mounting base locking screw is positioned horizontal referenced to the base. WARNING ! When you insert or remove the module while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations.
1-4 Installing the ASCII Module Installing the Removable Terminal Block A removable terminal block is supplied with your mounting base assembly. To remove, pull up on the RTB handle. This allows the base to be removed and replaced as necessary without removing any of the wiring. To reinsert the removable terminal block, proceed as follows. 1. Insert the RTB end opposite the handle into the base unit. This end has a curved section that engages with the mounting base.
Installing the ASCII Module Removing a Mounting Base 1-5 To remove a mounting base, you must remove any installed module, and remove the removable terminal block (if wired). 1. Unlatch the RTB handle on the I/O module. 2. Pull on the RTB handle to remove the removable terminal block. WARNING ! When you connect or disconnect the Removable Terminal Block (RTB) with field side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.
1-6 Installing the ASCII Module Wiring the 1734-232ASC Module RS-232 Module Status Network Status Shielded Cable: The 1734-232ASC module requires shielded cable to help reduce the effects of electrical noise coupling. Ground each shield at one end only. A shield grounded at both ends forms a ground loop, which can cause module communications to fault. Never connect a shield to the common side of a logic circuit (this would introduce noise into the logic circuit).
Installing the ASCII Module Terminal 0 1 2 3 4 5 6 7 Module Terminations RS-232 RS-485 1 S+1 Tx 2 Rx NC NC S-2 NC NC NC NC NC NC NC CG SG SG 1-7 RS-422 Tx+1 Rx+1 Tx-2 Rx-2 NC NC CG SC 1 S+ and Tx+ are transmit from the module 2 S- and Rx- are receive into the module RS-232 1 0 Tx 2 S+ 3 4 2 NC NC 7 6 2 NC CG 43124 Tx, S+ = Transmit NC = No Connection CG = Chassis Ground 3 4 NC 7 Rx+ Tx- 5 NC SG Tx+ 3 4 NC 1 0 NC S- 5 NC RS-422 1 0 Rx NC 6 RS-485 Rx5 NC NC 6
1-8 Installing the ASCII Module Cable Pinouts for Standard DB Connectors How to Install a Serial Network Table 1.1 ASCII Functions Pin Number Function DB-25 DB-9 Transmit Data (TXD) 2 3 Receive Data (RXD) 3 2 Signal Ground (SG) 7 5 The communication between your serial device(s) and the: · 1734-232ASC is an RS-232 3-wire network. · 1734-485ASC is an RS-485 2-wire network or RS-422 4-wire network 1. Connect an appropriate cable to your device. 2.
Installing the ASCII Module 1-9 5. The ASCII module produces and consumes the number of ASCII characters selected plus four. These produce and consume sizes are presented for your information in parameters 13 and 23, respectively. TIP How to Read Serial Device Input Data from the ASCII Module Make sure that you set up your scanner to the correct sizes using this data. 1. Connect to the ASCII module from your configuration tool. 2.
1-10 Installing the ASCII Module How to Write Serial Output Data to the ASCII Module 1. Connect to the ASCII module from your configuration tool. 2. Connect the serial side of the ASCII module to your computer’s serial port or another serial device. 3. Go to the device configuration screen in the configuration tool. 4. Make sure that the ASCII module is in the default factory configuration. 5.
Installing the ASCII Module Setting Up DeviceNet Communications 1-11 The ASCII module supports 4 modes of data transfer of the serial buffer: · · · · Polled I/O Change of State I/O Cyclic I/O Explicit Message Polled I/O The ASCII module monitors the transaction ID for a change in the transaction ID. If the transaction ID changes, then the ASCII module transmits the data buffer on its serial link. If the transaction ID does not change, then the device does not transmit the data buffer.
1-12 Installing the ASCII Module Cyclic and Change of State I/O The Cyclic and Change of State (COS) connections initiate a DeviceNet message (production) every time the connection timer (EPR) expires. They report the most current data in the ASCII module’s serial port receive buffer. In addition, the COS sends a data string each time a new serial input is received from the external serial device. This initiates the data transfer upon receipt of the delimiter or an overflow at its serial port.
Installing the ASCII Module 1-13 The transmit and receive sizes of the I/O connection are automatically computed for you by the ASCII module. You must set the maximum RX and TX sizes first and then choose apply. Upload the data to the ASCII module by clicking Upload. The scanner’s I/O connection TX field should be set to the value of "Consume Assembly Size" parameter 23. The RX size of the scanner should be set to the value of "Produce Assembly Size" parameter 13.
1-14 Installing the ASCII Module Operating Mode Selections The ASCII module has several different operating modes, some of which are available only in certain combinations. Major options are summarized below, with additional details provided in chapter 2. Transmit Handshake vs. Transmit Immediate Option This option defines when the ASCII module transmits data out of its serial port.
Installing the ASCII Module 1-15 Produce Immediate vs. Master/Slave Handshake Option This option defines when the ASCII module sends new data to the DeviceNet Master (produces new data on DeviceNet). In Produce Immediate mode (default), the ASCII module sends its most current serial port data to the DeviceNet Master in response to each Poll command or explicit message, or in response to a COS or Cyclic event.
1-16 Installing the ASCII Module Notes: Publication 1734-UM009B-EN-P - July 2003
Chapter 2 Configuring Your ASCII Module About Communications The ASCII modules have DeviceNet-to-serial link communication that provides a flexible DeviceNet interface to a wide variety of ASCII devices. Used with the POINT I/O system, these modules allow you to easily and conveniently connect and integrate peripheral products with RS-232, RS-485, or RS-422 serial ports into a DeviceNet system. Data can be exchanged with the master through a polled, cyclic, or change-of-state connection.
2-2 Configuring Your ASCII Module Configuration Overview You must use the RSNetworx for DeviceNet software to configure your module. You can configure the module while it is: · online or · offline This chapter shows configuration in the online mode. Configuration screens appear similar in both modes. The primary difference is that if you make changes offline, you must go online before the configuration changes take effect. You can also configure the module using Autostart Mode.
Configuring Your ASCII Module 2-3 What Does Auto Start Mode Do? When using Auto Start Mode, the adapter: 1. Sets all modules on the backplane to Auto Baud. 2. Reads module IDs on the backplane. 3. Sets modules addresses sequentially. 4. Generates a scanlist for the backplane. 5. Maps I/O data, based on byte, word and double-word boundaries. When this sequence of events is completed, the POINT I/O modules connected to the adapter are ready to accept connections from a scanner.
2-4 Configuring Your ASCII Module Adding the ASCII Modules to Your Network Follow these steps: 1. Start the RSNetworx for DeviceNet software. 2. Add the communication device as shown below. (In this case, the chosen device was a 1734-ADN DeviceNet adapter.) 1. Click here to expand the list of communication adapters. 2. Double-click on the 1734-ADN DeviceNet adapter. You can also click and drag the adapter name onto the network. The module appears on the network.
Configuring Your ASCII Module 2-5 Adding I/O Modules to Your Network After you add the communication device, you must add the POINT I/O modules connected to the scanner on the PointBus. 1. Add modules as shown below. 1. Click here to expand the list of Specialty modules. 2. Double-click on the catalog number to choose the module. You can also click and drag the module name The out-of-the-box node setting for 1734 modules is 63. You can change the setting by using the node commissioning tool.
2-6 Configuring Your ASCII Module Setting the ASCII Module’s Parameters After adding the module to the network, you must configure the module for use. The 1734-232ASC and -485ASC modules are configured identically. IMPORTANT This chapter shows configuration in the online mode. Changes set in this mode take effect when you download to the individual module. 1. Configure the modules by right-clicking on the module and choosing properties, or double-clicking on the module.
Configuring Your ASCII Module 2-7 Refer to the screens below for an explanation of its features. The module’s name appears here. Click on the Device parameters tab to get to the screen for setting the parameters. Type a description here. The module’s address appears here. You can change the node address if necessary. This screen also shows the module’s device identity. These fields are read-only. At any point, you can click here to finish changing configuration parameters.
2-8 Configuring Your ASCII Module Checking I/O Status and Viewing the EDS File You can view the I/O data setup, and the EDS file by clicking on the appropriate tab. Click on the I/O Defaults tab to display the default characteristics for this module. This screen shows the input/output defaults for the four modes. These are: Strobe Polled Change of state and Cyclic Click on the EDS File tab to display the statistics of the EDS file used to configure this module.
Configuring Your ASCII Module Configuration Assembly 2-9 The ASCII modules support a configuration assembly, that is accessed through the Assembly Object (Class 4), Instance 103. The configuration assembly is 18 bytes. Table 2.2 Configuration Assembly Byte Parameter Parameter Instance (See Table 2.
2-10 Configuring Your ASCII Module Parameter List Use this table for information on configuring your ASCII module’s parameters. Table 2.
Configuring Your ASCII Module 2-11 Table 2.
2-12 Configuring Your ASCII Module Table 2.
Configuring Your ASCII Module 2-13 Table 2.
2-14 Configuring Your ASCII Module Table 2.3 Parameter List Parameter Parameter Access Instance Description Parameter Choices Default Setting Default Value Data Type Sequential AutoAddress 29 Get Sequential AutoAddress will reassign the node address of every module to the right. Each module will change it’s node address to one greater than it’s neighbor. Make sure the node address of this module is the desired value before issuing this command.
Configuring Your ASCII Module POINT I/O Parameters 2-15 Receiving Serial Data from the ASCII Device The ASCII modules receive a number of characters and transmits these to the DeviceNet master via: · I/O - poll, COS, or cyclic messages · explicit message The received character string is captured when: · the specific number of bytes defined (Receive Character Buffer Length) is received, or · the defined End-of-String Terminator character is detected.
2-16 Configuring Your ASCII Module Setting Up and Using Pad Mode Pad Mode operation adds extra characters to the end of its received data string (after the delimiter character). These characters are added from the external I/O device before sending the string to the DeviceNet scanner (master) as an I/O response.
Configuring Your ASCII Module 2-17 Setting Up and Using the Swap Bytes Mode This option may be helpful if the ASCII module is connected to a DeviceNet scanner that organizes the data string characters into data type elements that are larger than 1 byte each (i.e. SLC500). In such cases, the bytes of the data in the master’s memory organization can be reversed from the order in which they are sent or received on the DeviceNet and the serial link to the ASCII device. This may cause errors in some cases.
2-18 Configuring Your ASCII Module Setting Up and Using Delimiter Operation When receiving data strings from your serial device, the ASCII module can take advantage of both Start and Stop (End) delimiters. The Start Delimiter is the start-of-string indicator and the End Delimiter is the end-of-string indicator. When you select Start Delimiter operation, you define a character that prompts the ASCII module to start storing the incoming data string.
Configuring Your ASCII Module 2-19 Table 2.4 Receive Data Format - Array Data Type Byte 1 Byte 2 Byte 3 Byte 4 Byte 5-X Byte X+1 (Max = 132) RX Transaction ID Byte Status Byte Reserved Reserved ASCII Data (max 128 bytes) (Terminator) Table 2.5 Receive Data Format - Short_String Data Type Byte 1 Byte 2 Byte 3 Byte 4 Byte 5-X Byte X+1 (Max = 132) RX Transaction ID Byte Status Byte Reserved Length ASCII Data (max 128 bytes) (Terminator) Table 2.
2-20 Configuring Your ASCII Module Explicit Messages to Receive the Serial Data String Parameters 14, 15, and 16 contain the status of the most recent incoming serial data string. You can use the data to read your device’s ASCII data via the explicit messaging technique. Parameter 14 holds the most recent received data. Parameter 15 defines the size (in bytes) of the DeviceNet message to be sent by the ASCII module to the master.
Configuring Your ASCII Module 2-21 RX Parity Error (Bit 2) This bit is set if a parity error is detected on the received data. Handshake Error (Bit 6) This error will occur only in Master-Slave Handshake Mode. It indicates that the master has requested a new data record from the ASCII module, but the ASCII module has not indicated new data is available to be sent. New Data (Bit 7) This bit is used only when the Master-Slave Handshake option is active.
2-22 Configuring Your ASCII Module Setting Up the Transmit Character Buffer Length The Transmit Character Buffer Length is the number of characters that the ASCII module can receive in its transmit buffer from the DeviceNet network. This size contributes to the I/O’s consume size. This size can be found in the Parameter object.
Configuring Your ASCII Module 2-23 Transmit String Data Assemblies Transmit String Data Assemblies are the formats of the data you will send from the ASCII module – array, short_string or string – to the DeviceNet master. Which one you choose depends on your application, and will modify the format of the data field. Table 2.
2-24 Configuring Your ASCII Module Transmit Handshake vs. Transmit Immediate Mode This option defines when the ASCII module transmits data out is serial port. Transmit Handshake mode is used primarily in Polled I/O to prevent the ASCII module from repeatedly sending its data buffer to the serial device each time an I/O command is received.
Configuring Your ASCII Module 2-25 A transmission of the serial data from the ASCII module to your ASCII device can be initiated in two ways. If an I/O connection is used, serial data in the mapped I/O location will be sent to the ASCII module on every I/O command (repeatedly at the same interval of the DeviceNet scanner). · In Transmit Handshake Mode, changing the transaction ID will always initiate a transmission on the network.
2-26 Configuring Your ASCII Module Transmitting Serial Data The length of the string sent determines the use of a delimiter in transmitting data to a serial device from the ASCII module. · If the string length is zero (as dynamically defined by the third and fourth bytes in the message header), or if the data type is Array: The ASCII module receives data sent from the DeviceNet master and uses the delimiter to determine how much data is sent to the serial device.
Configuring Your ASCII Module 2-27 Produce Immediate vs. Master/Slave Handshake Mode Selecting the mode option defines when the ASCII module sends new data to the DeviceNet Master (produces new data on DeviceNet). In Produce Immediate mode (default), there is no gating by the ASCII module of data sent from the ASCII module to the DeviceNet Master. The module sends its most current serial port data to the Master in response to each Poll command or explicit message, or in response to a COS or Cyclic event.
2-28 Configuring Your ASCII Module The master monitors the new data flag and when the master is ready to receive new serial data, it sets a new number in the new RX ID byte of the I/O message. Note that this applies only to data being sent from the ASCII module to the master. The operation proceeds as follows: · The ASCII module receives a new data string. · The ASCII module sets the New Data Flag in the Status byte of its next produce message.
Chapter 3 Diagnostics Using the Indicators for Troubleshooting Use these indicators to help you troubleshoot any problems with your ASCII modules. RS-232 RS-485 Module Status Module Status Module Status Network Status Network Status Network Status NODE: NODE: RS485 / 422 ASCII TxD 1734 232ASC TxD RxD 1734 232ASC RxD 1734 485ASC 43125 43490 Table 3.1 Module Status Indicators Indication Probable Cause Module Status Off No power applied to device. Green Device operating normally.
3-2 Diagnostics Table 3.2 Network Status Indicators Indication Probable Cause Network Status Off Device is not on-line. - Device has not completed dup_MAC_id test. - Device not powered - check module status indicator. Flashing Green Device is on-line but is not allocated to a master. Green Device on-line and has connections in the established state. Flashing Red One or more I/O connections in timed-out state. Red Critical link failure - failed communication device.
Appendix A Specifications Specifications for the ASCII Modules 1 Specifications - 1734-232ASC, -485ASC Modules Number of Inputs 1 full duplex Input Voltage Signal with respect to Signal Ground (SG) "0", Asserted, ON, Space, Active +3 to +25V dc "1", Disasserted, OFF, Mark, Inactive -3 to -25V dc Indicators 1 green/red module status indicator, logic side 1 green/red network status indicator, logic side 2 greed TXD, RXD status indicators, logic side Keyswitch Position 2 (specialty) Module Location 1734-T
A-2 Specifications Specifications - 1734-232ASC, -485ASC Modules (Continued) Receive Transaction ID 0-255 Serial Port Transmit to ASCII Device Max Number of Transmit Chars 1-128 Transmit End Delimiter Mode No, exclude, include end delimiter Transmit End Delimiter Character ASCII character Consume on DeviceNet from Master Consume String Data Type Array, short_string, string Transmit Swap Mode Disabled, 16-bit, 24-bit, 32-bit swap DeviceNet Record Header Mode Transmit header/immediate Consume Assembly Size
Specifications A-3 Specifications - 1734-232ASC, -485ASC Modules (Continued) EFT/B Immunity IEC 61000-4-4: +4kV at 2.
A-4 Specifications Notes: Publication 1734-UM009B-EN-P - July 2003
Appendix B Using the ASCII Modules with the ControlLogix System Application Examples About These Examples For these application examples, the 1734-PDN POINT I/O interface was used to interface with the DeviceNet network. The ASCII modules act as a normal slave to the master scanner. The data that is sent to/from the scanner contains the ASCII data and some specialty bytes.
B-2 Using the ASCII Modules with the ControlLogix System Application Examples EDS Configuration You can configure the ASCII modules through the EDS file using RSNetWorx for DeviceNet. For this example, the following configuration was used: Table B.
Using the ASCII Modules with the ControlLogix System Application Examples B-3 DeviceNet Data Details With this example’s EDS configuration, the ASCII modules take the maximum transmit and receive sizes from the EDS file and add an overhead of 4 bytes to each length. The data lengths in this example are 20 bytes, so the transmit and receive sizes for the scanner would be 24 bytes. The following table illustrates the format of the transmit and receive data with the header bytes. Table B.
B-4 Using the ASCII Modules with the ControlLogix System Application Examples Reading Data from the ASCII Modules into ControlLogix For this example, the advanced mapping feature in RSNetWorx for DeviceNet was used to separate the header bytes into their own data locations. The diagram below illustrates that the transaction ID is in Local:1:I.Data[0], the status byte is in Local:1:I.Data[1], and the length is in Local:1:I.Data[3]. The ASCII data starts in Local:1:I.Data[4].
Using the ASCII Modules with the ControlLogix System Application Examples B-5 The following ControlLogix ladder logic checks to see if the transaction ID in Local:1:I.Data[0] has changed from a previously stored value. If it has changed, the data starting in Local:1:I.Data[4] is copied to a file and the current ID is stored into a data location.
B-6 Using the ASCII Modules with the ControlLogix System Application Examples Transmitting Data from ControlLogix Through the ASCII Modules For this example, the advanced mapping feature in RSNetWorx for DeviceNet was used to separate the header bytes into their own data locations. The diagram below illustrates that the transaction ID is in Local:1:O.Data[1] and the length is in Local:1:O.Data[3]. The ASCII data starts in Local:1:O.Data[4].
Using the ASCII Modules with the ControlLogix System Application Examples B-7 The ladder logic below increments a counter every 8 seconds and then copies the accumulator value of the counter into the transaction ID location Local:1:O.Data[1]. When the counter reaches 255, it is automatically wrapped around to 0. In the output table below, the data being transmitted is already inside the data table starting at Local:1:O.Data[4] and a constant length of 9 is in Local:1:O.Data[3].
B-8 Using the ASCII Modules with the ControlLogix System Application Examples Notes: Publication 1734-UM009B-EN-P - July 2003
1 A Adding ASCII module to network 2-4 I/O module to network 2-5 ASCII module adding to network 2-4 communications 2-1 ControlLogix examples B-1 diagnostics 3-1 general information 1-1 setting parameters 2-6 specifications A-1 wiring 1-6 Auto Start mode 2-2 requirements 2-3 B Base assembly mounting 1-1 Buffer RX overflow 2-20 TX overflow 2-20 C Cable pinouts 1-8 Change of State I/O 1-12 Checking I/O status 2-8 I/O defaults 2-8 Commissioning a node 2-5 Communications general information 2-1 Configuration
2 K Keyswitch position 1-3 M Mode auto start 2-2 data only 2-24 handshake 1-15, 2-27 immediate 1-15, 2-27 no pad 1-15 pad 1-15 setting up 2-16 record header 2-24 Module installation 1-3 Mounting base assembly 1-1 Mounting base installing 1-1 removing 1-5 N New data 2-21 No pad mode 1-15 Node commissioning tool 2-5 Node setting (out of box) 2-5 O Operating mode selections 1-14 Output data writing serial output 1-10 Overflow RX buffer 2-20 TX buffer 2-20 Publication 1734-UM009B-EN-P - July 2003 P Pad mo
3 S Scanner I/O receive size setting up 2-19 Scanner I/O transmit size setting up 2-26 Selecting operating mode 1-14 Serial data receiving 2-15 transmitting 2-21, 2-26 Serial data string transmit explicit messages 2-28 Serial device reading input data 1-9 Serial network installing 1-8 Serial output data writing 1-10 Setting up ASCII module parameters 2-6 connection timer (EPR) 1-13 delimiter operation 2-18 DeviceNet communications 1-11 DeviceNet I/O connections 1-12 pad mode 2-16 receive character buffer l
4 Publication 1734-UM009B-EN-P - July 2003
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