Mitsubishi QJ71C24N User Manual page 111

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
Correct insertion
Incorrect insertion
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(c) When connecting the terminal resistor of the QJ71C24N-R4 to the plug-in
terminal block of the RS-422/485, insert the terminal resistor as shown below.
POINT
1) When an RS-232 to RS-422 converter is used at a terminal station on the line, a
terminal resistor must be connected and set at the converter.
2) When connecting the external device(s) and serial communication module(s)
with RS-232 to RS-422 converter(s), the converters must support the system
configurations (1:1, 1:n, and m:n).
3) To the RS-422/485 interface of the serial communication module, an RS-422 or
RS-485 device must be connected, including the cases of 1:n, n:1 and m:n
connections.
Inserted vertically.
Inserted horizontally.
MELSEC-Q
4 - 8