
SMG-5420 User Manual Ver. 1.1
- 10 -
⚫
RS485 Signal Lines
Label
Name
Description
Level
I/O
Wiring
TR+
TRX +
Data +
RS485
In/Out
Required
TR-
TRX -
Data -
RS485
In/Out
Required
G
GND
Ground
Ground
-
Required
Table 2-3 RS485 Signal Lines
⚫
RS422 Signal Lines
Label
Name
Description
Level
I/O
Wiring
TR+
TX +
Transmit Data +
RS422
Out
Required
TR-
TX -
Transmit Data -
RS422
Out
Required
R+
RX +
Receive Data +
RS422
In
Required
R-
RX -
Receive Data -
RS422
In
Required
G
GND
Ground
Ground
-
Required
Table 2-4 RS422 Signal Lines
Each signal line for RS422/RS485 has a 3.9K
Ω
built-in biasing resistor.