IDEC MICRO/I HG2J-7U Hardware Manual page 31

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Serial Interface (COM2)
Use applicable cables for wiring and recommended ferrules (made by Phoenix Contact or Weidmüller) as follows.
Interface Specification
Connector
Applicable cable
Recommended ferrule
Tightening Torque
No.1
No.
Name
1
SD
2
RD
3
RS
4
CS
5
SG
6
SDA
7
SDB
8
RDA
9
RDB
Only one ferrule can be inserted into a terminal hole.
Please set another terminal block in the vicinity of the main unit and connect SG when using RS232C and
RS422/485 requiring crossover wiring at the same time. And separate the communication cables so that
they do not affect each communication waveform when using RS232C and RS422/485 at the same time.
Using RS422/485 interface
When using RS422/485 interface, set the Terminating Resistor Selector Switch to the ON side. This will connect the
internal terminating resistor (120Ω) between RDA and RDB.
OFF 
Terminating Resistor Selector Switch (for RS422/485 interface)
Expansion Module Interface (EXT)
IDEC MICROSmart expansion modules can be connected to the HG5G/4G/3G/2G-V.
Refer to Chapter 2 "1.2 Applicable Expansion Modules" on page 2-2 for the number, the types and the combination of
the expansion modules that can be installed.
RS232C, RS422/485
Detachable Terminal Block 9-pin
AWG20 to 22
AI 0,34-8 TQ
AI 0,5-8 WH
AI-TWIN 2 x 0,5-8 WH
(Phoenix Contact)
0.22 to 0.25 N·m
No.9
I/O
OUT
Send Data
IN
Receive Data
OUT
Request to Send
IN
Clear to Send
Signal Ground
OUT
Send Data (+)
OUT
Send Data (-)
IN
Receive Data (+)
IN
Receive Data (-)
ON 
MICRO/I Hardware Manual
H0,34/12 TK
H0,5/14 OR
H0,5/14 ZH OR
(Weidmüller)
Function
2 HG5G/4G/3G/2G-V
Communication type
RS232C
RS422/485
1-21
1

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