Installation manual

Publication 1747-RM001G-EN-P - November 2008
13-66 SLC Communication Channels
Table 13.20 Define these parameters when configuring a SLC 5/03, 5/04, or 5/05 processor as a master station using
message-based polling mode to communicate with slave stations.
Tab Parameter Default Selections
General Diagnostic File 0 SLC 5/03 (OS 302, Series C or higher), SLC 5/04 (OS 401, Series C or higher) and SLC 5/05
only. Select an unused file (9-255) to store channel status information. You must define a
diagnostic file in order to be able to view channel 0 status. See Table 13.21 on page 13-68
for a file description.
Channel 0
System
Baud Rate 1200 Select a communication rate that all devices in your system support. Configure all devices in
the system for the same communication rate.
Parity None Parity provides additional message packet error detection. To implement even parity
checking, choose Even. To implement no parity checking, choose None.
Stop Bits 1 Match the number of stop bits to the devices with which you are communicating.
Node Address 0 A node address identifies the processor on the DF1 half-duplex link. Each station on a link
must have a unique address. Choose an address between 0
10
and 254
10.
Node address255
10
is the broadcast address, and cannot be selected as a station’s individual address
Control Line No
Handshaking
This parameter defines the mode in which the driver operates. Choose a method appropriate
for your system’s configuration.
• If you are not using a modem, choose NO HANDSHAKING.
• If the master modem is full duplex, choose FULL-DUPLEX.
• If all the modems in the system are half-duplex, choose HALF-DUPLEX WITHOUT
CONTINUOUS CARRIER.
See page 13-86 for descriptions of control line operation settings.
Error
Detection
CRC With this selection, you choose the how the processor checks the accuracy of each DF1
packet transmission.
BCC: This algorithm provides a medium level of data security. It cannot detect:
• transposition of bytes during transmission of a packet.
• the insertion or deletion of data values of zero within a packet.
CRC: This algorithm provides a higher level of data security.
Select an error detection method that all devices in your configuration can use.
When possible, choose CRC.