RTCU NX-900 Technical Manual V1.02
Advanced M2M/IIoT Gateway
Logic IO ApS.
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Page 25 of 45
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RS485 port 1
RS485 signals are available on the angled back terminals.
If TER1 jumper is inserted, a 120
Ω endpoint resistor is enabled. For the location of TER1 refer to
Appendix A
RS485 port 1 terminals
Terminal Name
Description
RS485 non-inverting signal (A)
RS485_1-
RS485 inverting signal (B)
SGND
Signal ground
This RS485 port must be addressed as
port 2
when using the VPL API such as the serOpen
function.
RS485 port 2
The RS485 port is available on the angled front terminals.
If TER2 jumper is inserted, a 120
Ω endpoint resistor is enabled. For the location of TER2 refer to
Appendix A
RS485 port 2 terminals
Terminal Name
Description
RS485 non-inverting signal (A)
RS485_2-
RS485 inverting signal (B)
SGND
Signal ground
This RS485 port must be addressed as
port 3
when using the VPL API such as the serOpen
function.