Figure A.8:Com 3&4 Port Terminator Resistors; Table A.5:Rs-422 Terminal Resistors (Com3&4); Table A.6:Rs-485 Terminal Resistors (Com3&4) - Advantech GX2-400 User Manual

Terminator Resistor Setup for RS-422/485
The terminal resistors for impedance matching on the UNO-2059E are
not installed in the factory. Users can install the resistors with the appro-
priate resistances according to the UNO-2059E application. Each termi-
nal resistor responds to different channels for RS-422/485 signal lines.
Usually, these resistors are needed for both ends of the communication
wires and the value of the resistors should match the characteristic imped-
ance of the wires used (approximately 120 W or 300 W).
The TR3, TR4, TR5 and TR6 shown on Figure A-8 are prepared for
COM3 and COM4 termination resistors respectively.
Figure A.8: COM 3&4 Port Terminator Resistors
Table A.5: RS-422 Terminal Resistors (COM3&4)
Serial Port
COM3
COM3
COM4
COM4
Table A.6: RS-485 Terminal Resistors (COM3&4)
Serial Port
UNO-2059E User Manual
COM3
COM4
Terminal Resistor
TR3 (Tx+, Tx-)
TR5 (Rx+, Rx-)
TR4 (Tx+, Tx-)
TR6 (Rx+, Rx-)
Terminal Resistor
TR3 (Data+, Data-)
TR4 (Data+, Data-)
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