PNI Legacy Comm Board - Manual (Page 5)

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Page 5 of 42
Serial Pin Descriptions
Figure 1: Jumpers and Connectors
Table 4: Serial Pin Descriptions (J1)
Pin Name Function
1 TxD RS-232 transmitter output (transmitted data)
2 Reserved RS-232 transmitter output (reserved)
3 n/c not connected
4 RxD RS-232 receiver input (received data)
5 D– RS-485 transceiver signal (inverting RS-485 signal)
6 D+ RS-485 transceiver signal (non-inverting RS-485 signal)
7 n/c not connected
8 GND Ground
9 VCC Supply voltage (5 to 12 VDC)
10 GND Ground
RS-232 and RS-485 Jumper Settings
Table 5: Jumper Configuration
Configuration Mode
JMP1 installed a RS-232
JMP1 removed a RS-485
JMP2 installed b RS-485; 120 Ω line termination
JMP2 removed b RS-485; no line termination
a. The processor only checks the status of JMP1 at power up. IF the position of the jumper
needs to be changed, either cycle the power or press the RESET switch after the change
has been made.
b. JMP2 must only be installed on the last unit of the network. All other units need to have
JMP2 removed for proper RS-485 operation.
CommBoard
Specifications