Installation manual

Publication 1747-RM001G-EN-P - November 2008
13-58 SLC Communication Channels
Table 13.17 Define these parameters when configuring a SLC 5/03, 5/04, or 5/05 processor as a master station using standard
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 to 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 device 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
MODEM.
• If all the modems in the system are half-duplex, choose
HALF-DUPLEX WITHOUT CONTINUOUS CARRIER.
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.