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en | Connection Instructions
AMC MUX and AMC MUX-EXT
F.01U.012.855 | V.3 | 2006.08
Installation manual
Bosch Security Systems
6.3.2
RS-485 4-Wire/RS-422 Interface
shows the circuit diagram of an RS-485 4-wire inter-
face.
Fig. 6.6
RS-485 4-wire connection scheme
The pin assignment are identical between RS-422 and RS-485 4-
wire. RS-422 only supports point-to-point connections, while
RS-485 4-wire also supports bus systems.
Signal
Identifier/PIN
Receive data (+)
RT+
Receive data (-)
RT-
Transmission data (+)
T+
Tansmission data (-)
T-
Balance circuit
PAG
Ground
Tab. 6.5
RS-485 4-Wire Interface Pin Assignments
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