Rockwell Automation 1203 Serial Communications Module Series B - Manual (Page 21)

2–7 Installation
1203–5.5 September 1995
Note: If you are using the DH–485 communications mode, setting
switches SW2–4, SW2–5, SW2–6. SW2–7, and SW2–8 have no
effect because this information is selected within the software.
Use SW2–5 and SW2–4 to set the parity:
SW2 Function
O
–
8 7 6 5 4 3 2 1
Parity disabled
O
–
8 7 6 5 4 3 2 1
Even parity
O
–
8 7 6 5 4 3 2 1
Odd parity
Use SW2–6 to choose between 1 stop bit and 2 stop bits:
SW2 Function
O
–
8 7 6 5 4 3 2 1
1 stop bit
O
–
8 7 6 5 4 3 2 1
2 stop bits
Use SW2–7 to choose between point–to–point and multi–drop:
SW2 Function
O
–
8 7 6 5 4 3 2 1
Point–to–point
O
–
8 7 6 5 4 3 2 1
Multi–drop
Use SW2–8 to choose between BCC checksum mode and CRC
checksum mode:
SW2 Function
O
–
8 7 6 5 4 3 2 1
BCC Checksum
O
–
8 7 6 5 4 3 2 1
CRC Checksum
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