Safety Relay Instruction Manual

Communication Module MSR240 4
RS485 Interface Description
Data relating to the MSR200 System is transmitted via the RS485 channel only in
response to a command characters string received by the MSR240:
Character 1 Start byte = 2
Character 2 Address1 = 48..51 (0..3) [Address x 10]
Character 3 Address0 = 48..57 (0..9) [Address x 1]
Character 4 Function = 49 (1) [1 = Function: send character]
Character (5) XOR-linkage of Address1, Address0 and Function (optional)
Character 5 (6) End byte = 3
Addresses in the range 0 to 31 can be set via five DIP switches. Addresses below 10
must start with a zero.
Function setting is fixed at 49 (1) and is the code to send data.
Baud rate can be selected via two DIP switches from the following values:
• 2400 baud Bit 0 = OFF Bit 1 = OFF
• 4800 baud Bit 0 = OFF Bit 1 = ON
• 9600 baud Bit 0 = ON Bit 1 = OFF
• 19200 baud Bit 0 = ON Bit 1 = ON
ONON
Address bit 4
Address bit 3
Address bit 2
Address bit 1
Address bit 0
Baud rate bit 1
RS485 Interface: DIP Switch Settings
ON = XOR check enabled