3.4.5. RS-422/485 Connection
Illustration
Pin no.
Signal
Direction
Description
RS-422 (4-
wire)
RS-485 (2-
wire)
Pin 8
Pin 1
1
T+
T+/R+
Out/In
RS-422: Transmit
RS-485: Transmit/
Receive
2
T-
T-/R-
Out/In
RS-422: Transmit
RS-485: Transmit/
Receive
3
R-
-
In
RS-422: Receive
4
-
-
-
Not used
5
-
-
-
Not used
6
R+
-
In
RS-422: Receive
7
-
-
-
Not used
8
-
-
-
Not used
Table 10. RS-422/485 connection
Lynx is equipped with with an internal termination that is configurable through software in
RS-422/485 mode. The following termination schemes are supported:
No termination
Rx
Terminate Rx
Terminate Tx
Tx
Rx
Tx
Rx
Tx
Rx
Tx
Terminate Tx and Rx
Figure 6. RS-422 termination scheme
No termination
Termination
Figure 7. RS-485 termination scheme
16
Lynx L108/208-F2G-S2
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