Rockwell Automation 440R MSR300 Modular Safety Control System - Manual (Page 69)

MSR300 Safety System Manual
Rockwell Automation
MSR300 Manual.doc Pg 69 of 85
9
Serial Data Communication: Details
The MSR310 is equipped with two RS232 serial data interfaces: one can be used in bi-
directional, the other in uni-directional mode.
9.1 Serial Data Interface Connections
The serial interface connections are illustrated below.
TxD1
RxD1
GND
RS-232
Bi-
directional
TxD2
GND
RS-232
Uni-
directional
9.2 RS232
Bi-directional
Bi-directional RS232 features automatic baud rate detection, and can handle baud rates
of 2400, 4800, 9600, or 19200 baud.
9.2.1 Protocol:
Supported exception codes:
Code Name
Meaning
0x01 Illegal function The function code is not supported by the
MSR310
0x02 Illegal data address The data address in the query is not allowed
for the MSR310
0x03 Illegal Data Value The data value in the query is not valid
Supported functions:
Code Name
Meaning
0x03 Read Multiple
Registers
Reads the contents of a sequence of registers
0x06 Write Single
Register
Writes a value to a single register.