2 PCM-261X Startup Manual
Terminal Resistor Settings
COM Port
Switch
Pin
Setting
RS-422 Des
cription
RS-485 Des
cription
COM 1
SW2
1
ON
120 Ohm between Tx+/Tx-
120 Ohm between Data+/Data-
OFF
Open (Default)
2
ON
120 Ohm between Rx+/Rx-
Invalid
OFF
Open (Default)
COM 2
3
ON
120 Ohm between Tx+/Tx-
120 Ohm between Data+/Data-
OFF
Open (Default)
4
ON
120 Ohm between Rx+/Rx-
Invalid
OFF
Open (Default)
COM 3
SW3
1
ON
120 Ohm between Tx+/Tx-
120 Ohm between Data+/Data-
OFF
Open (Default)
2
ON
120 Ohm between Rx+/Rx-
Invalid
OFF
Open (Default)
COM 4
3
ON
120 Ohm between Tx+/Tx-
120 Ohm between Data+/Data-
OFF
Open (Default)
4
ON
120 Ohm between Rx+/Rx-
Invalid
OFF
Open (Default)
Board ID Setting
The comm. cards feature a built-in DIP switch for defining the card’s board ID. When multiple cards are installed, the board ID
switch is useful for identifying the device number of each card.
Board ID Setting
SW Position 3 Position 2 Position 1 Position 0
BoardID
BID3
BID2
BID1
BID0
0
ON
ON
ON
ON
1
ON
ON
ON
OFF
2
ON
ON
OFF
ON
3
ON
ON
OFF
OFF
4
ON
OFF
ON
ON
5
ON
OFF
ON
OFF
6
ON
OFF
OFF
ON
Jumper Settings (Cont.)
