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10
Direct Communication Module
Starting I/O Group Number (SW1-7 and SW1-8)
The starting I/O group number must be an even number from 0 to 6 (e.g. 0, 2, 4, or
6) and is dependent upon whether the 1747-DCM has been configured as a full, ¾,
½, or ¼ chassis. The first word transferred is always the status word for the
1747-DCM.
The table below shows the switch settings for the starting I/O group numbers.
Starting I/O Group Number
0
2
4
6
DIP Switch 2 Settings
The default settings are shown below.
Data Rate (SW2-1 and SW2-2)
Data Rate
SW2-1
57.6K baud
ON
115.2K baud
ON
230.4K baud
OFF
OFF
Publication 1747-IN005B-EN-P - March 2003
SW1-7
ON
ON
OFF
OFF
Reserved
Rack Size
Last Rack
Clear On Fault
Data Rate
SW2-2
Cable Length (Belden 9463)
ON
3048 meters (10,000 feet)
OFF
1542 meters (5,000 feet)
ON
762 meters (2,500 feet)
OFF
SW1-8
Valid Chassis Configuration
ON
All
OFF
¾, ½, ¼
ON
½, ¼
OFF
¼
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