Port Expander Model 232PE Document No. 232PE3095 This product Designed and Manufactured In Ottawa, Illinois USA of domestic and imported parts by B&B Electronics Mfg. Co. Inc. 707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 Internet: http://www.bb-elec.com sales@bb-elec.com techsupt@bb.elec.
TABLE OF CONTENTS Chapter 1: HARDWARE....................................................1 Introduction .........................................................................1 Checklist .............................................................................2 Port Expansion Bus.............................................................2 Setting The Address............................................................2 Connecting To The Bus.......................................................
ii Table of Contents 232PE3095 Manual B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094
Chapter 1: HARDWARE Introduction The Port Expander (232PE) adds four asynchronous serial data ports to the Expandable Smart Switch (232XSS). Up to fifteen Port Expanders can be connected to a single 232XSS via the Port Expansion Bus. Refer to Figure 1. This expands the eight ports on the 232XSS to a maximum of sixty-eight ports. RS-232 ports are standard on the 232PE, RS-422/485 ports are optional. RS-232 ports are configured as DTE ports and support signals TD, RD, RTS, CTS, DTR, and DSR or CD.
Checklist The following equipment should be in the shipping carton: 1. Port Expander 2. Instruction Manual If any of the items above are damaged or missing contact the shipper immediately. Port Expansion Bus The number of serial ports on the Expandable Smart Switch can easily be expanded to a maximum of sixty-eight ports by daisy chaining Port Expander units on the 232XSS's expansion bus. A maximum of fifteen Port Expander units can be added to a 232XSS.
Figure 2. Printed Circuit Board Outline * PC board for optional RS-422/485 port.
Table 1. Address Switch DIP Switch 1 1 2 3 4 Address 0 0 0 0 Invalid 1 0 0 0 1 0 1 0 0 2 1 1 0 0 3 0 0 1 0 4 1 0 1 0 5 0 1 1 0 6 1 1 1 0 7 0 0 0 1 8 1 0 0 1 9 0 1 0 1 10 1 1 0 1 11 0 0 1 1 12 1 0 1 1 13 0 1 1 1 14 1 1 1 1 15* 1 = OFF 0 = ON * = FACTORY DEFAULT Connecting To The Bus Connecting the Port Expander to the Expandable Smart Switch bus is a simple task. On the rear panel of the Port Expander is an expansion bus cable, refer to Figure 3.
Port Configuration The 232PE has four selectable ports labeled "A" through "D". Refer to Figure 8. Any of the ports can be manufactured to meet either RS-232 or RS-422/485 electrical characteristics. RS-232 Configuration RS-232 ports will be wired as DTE ports. Refer to Table 2 for pin out, signal name, and signal direction information. Also, refer to Figure 4 for a simplified schematic showing the relationship between the master port of the 232XSS and any RS-232 port of the 232PE.
Figure 4. Simplified RS-232 Schematic RS-422/485 Option The RS-232 transmit and receive data signals on the master port of the 232XSS will be converted to balanced full-duplex RS422 or half-duplex RS-485 signals with this option. Table 3.
Figure 5. Simplified RS-422/485 Schematic When a port has this option, an additional printed circuit board will be mounted to the main board. Use Figure 2 to locate its position. Refer to Table 3 for pin out, signal name, and signal direction information. Also, refer to Figure 5 for a simplified schematic showing the relationship between the master port and a port configured with the RS-422/485 option. NOTE: This option only supports transmit and receive data signals (TD & RD) from the master port.
The EIA RS-422 Specification labels data lines with "A" and "B" designators. Some RS-422 equipment uses a "+" and "-" designator. In almost all cases, the "A" line is the equivalent of the "-" line and the "B" line is the equivalent of the "+" line. Figure 6. P.C. Board for Optional RS-422/485 Port RS-485 Mode There are two methods that can be used to control the RS422/485 driver: handshake control (RTS) and send data (SD) control. These methods are jumper selectable (JP1 "SD" & "RTS").
been sent. To change to a baud rate lower than 9600 baud, or to configure the send data control to match a specific baud rate, change R1 and C1 to the value specified in Table 4. Use Figure 2 to locate R1 and C1. Note that these timing components are not used when the handshake control method is selected. Table 4. Component Values For Send Data Timing Baud Rate 300 600 1200 2400 4800 9600 19.2K 38.4K 57.6K 115.2K Time (ms) 33.3 16.6 8.33 4.16 2.08 1.04 0.520 0.260 0.176 0.
Specifications Model: 232PE Size: 8"w x 6.3"d x 2.7"h Power: 120Vac 60hz 16w Figure 7. Front View Figure 8.
Appendix A: Cable Charts 232PE3095 Manual Appendix A B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 434-7094 A-1
These charts indicate some common cable wiring based on the DCE/DTE configuration of the 232XSS Master Port. Refer to the Port Configuration section of the 232XSS manual for information on Master Port configurations. Chart 1. IBM PC DB25 Connector to Master Port Master Port configured as a DCE port.
Chart 3. Modem DB25 Connector to Master Port Master port configured as a DTE port. Async Modem 232XSS Serial Port Signal Master Port (DTE) DB25 Connector Direction DB25 Connector 2 <----------2 3 -----------> 3 4 <----------4 5 -----------> 5 7 <---------> 7 8 -----------> 8* 20 <----------20 * Pins 6 & 8 are tied together inside the 232XSS and share the same input. NOTE: When using chart 3 above and connecting a DTE device to ports A - H of the smart switch, refer to Charts 7 and 8. Chart 4.
Chart 5. IBM PC DB25 Connector to Ports A - D (DTE) Master port of 232XSS configured as a DCE port. IBM PC 232PE Serial Port Signal Ports A - D (DTE) DB25 Connector Direction DB25 Connector 2 -----------> 3 3 <----------2 4 -----------> 5 5 <---------4 6 <---------6* 7 <---------> 7 8 <----------8* 20 -----------> 20 * Pins are tied together inside the 232PE and share the same input. Chart 6. IBM PC DB9 Connector to Ports A - D (DTE) Master port of 232XSS configured as a DCE port.
Chart 7. IBM PC DB25 Connector to Ports A - D (DTE) Master port of 232XSS configured as a DTE port with a modem connected (see Chart 3). IBM PC 232PE Serial Port Signal Ports A - D (DTE) DB25 Connector Direction DB25 Connector 2 -----------> 3 3 <----------2 4 -----------> 5 5 <----------4 6 <---- ----> 6* 7 <---------> 7 8 <----------20 20 -----------> 6* * Pins 6 & 8 are tied together inside the 232PE and share the same input. Chart 8.
Chart 9. RS-422/485 4-Wire Device to Port (A - D) Configured as an RS-422 /485 Port. Master port of 232XSS configured as an RS-232 DCE port. RS-422/485 232PE 4-Wire Signal Ports A - D Device Direction DB25 Connector TD (A)* -----------> 3 - RD (A) TD (B)* -----------> 16 - RD (B) Signal Ground <----------> 7 - SG RD (A)* <----------2 - TD (A) RD (B)* <----------14 - TD (B) * If the device being connected uses "+" and "-" in place of "B" and "A", the "+" replaces the "B" and the "-" replaces the "A".
FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFACE STATEMENT Class A Equipment This equipment has been tested and found to comply with the limits for Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
