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Section 4 : Electrical Interface
2015_2000007248-V1 - Draft
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40
June 2015
RS-485 port wiring
The following figure shows how to cable the wires of the RS-485 OUT port of the
terminal (RS-485 protocol). This is used, for instance, to connect the MorphoAccess®
SIGMA Lite terminal to an Access Control Panel (ACP).
terminal (RS-485 protocol). This is used, for instance, to connect the MorphoAccess®
SIGMA Lite terminal to an Access Control Panel (ACP).
Figure 18: RS-485 port wiring – RS485
5
Blue
RS485_A
In/Out RS485 Rx/Tx non inverting signal
7
Blue / Red
RS485_B
In/Out RS485 Rx/Tx inverting signal
6
Black / Red
RS485_GND
Ground
RS485 implementation is limited to half-duplex communication. So only Tx+, Tx- and
ground reference signals are necessary.
ground reference signals are necessary.
Depending on the RS485 network, an impedance adaptation may be required.
For farthest terminal, a 120-Ohms resistor termination may be added outside the
terminal between Tx+ and Tx-.
terminal between Tx+ and Tx-.