WindO/I-NV4 User’s Manual 35-25
2 HG4G/3G, HG2G-5F
35
MICRO/I Specifications
2.4
External Interfaces
● Serial Interface (COM1)
CAUTION
• Make sure to turn off the power to the HG4G/3G, HG2G-5F before wiring each interface or
switching the terminating resistor selector switch.
• Note that only one of the RS232C or RS422/485 interfaces can be used at one time. Wiring both
interfaces will result in failure of the HG4G/3G, HG2G-5F. Wire only the interface used.
Interface Specification RS232C, RS422/485
Connector D-sub 9-pin (Plug)
Screw lock bracket Inch Screw Thread #4-40 UNC
No. Name I/O Function
Communication type
1 4W-RDA/2W-A IN/INOUT Receive Data (+) [4W]/ Send and Receive Data (+) [2W] RS422/485
2 RD IN Receive Data RS232C
3 SD OUT Send Data RS232C
4 4W-SDA OUT Send Data (+) [4W] RS422/485
5 SG - Signal Ground -
6 4W-RDB/2W-B IN/INOUT Receive Data (-) [4W]/ Send and Receive Data (-) [2W] RS422/485
7 RS OUT Request to Send RS232C
8 CS IN Clear to Send RS232C
9 4W-SDB OUT Send Data (-) [4W] RS422/485
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