26
System Implementation
The four data channels can be configured individually to use any of the supported formats,
by using the appropriate Format Select pin (21, 23, 24, 26) as identified in the table.
Format Select pin:
Floating for RS-422 or TTL
Tied to any GND pin for RS-232
Tied to +12 VDC bias (pin #10) for RS-485
At the breakout panel, each data channel is presented on a separate DB9 connector, with
the following pinout
Data 3
RS232/422/485
5
Data 3: RS422 OUT (+) / RS232 OUT
14
Data 3: RS422 OUT (-)
4
Data 3: RS422 IN (-)/ RS485 I/O (-)
13
Data 3: RS422 IN (+) / RS485 I/O (+) / RS232 IN
23
Data 3 Format Select
Data 4
RS232/422/485
3
Data 4: RS422 OUT (+) / RS232 OUT
12
Data 4: RS422 OUT (-)
2
Data 4: RS422 IN (-)/ RS485 I/O (-)
11
Data 4: RS422 IN (+) / RS485 I/O (+) / RS232 IN
21
Data 4 Format Select
Ground
22
GND (data 3/4)
Format bias
10
Format bias +12 VDC
Function
Pin #
Signal
Data
RS232/422/485
9
Data : RS422 OUT (+) / RS232 OUT
5
Data : RS422 OUT (-)
1
Data : RS422 IN (-)/ RS485 I/O (-)
6
Data : RS422 IN (+) / RS485 I/O (+) / RS232 IN
2
Data Format Select
Function
Pin #
Signal
