WindO/I-NV4 User’s Manual 35-17
2 HG5G/4G/3G/2G-V
35
MICRO/I Specifications
2.4
External Interfaces
● Serial Interface (COM1)
CAUTION
• Make sure to turn off the power to the HG5G/4G/3G/2G-V before wiring each interface or
switching the terminating resistor selector switch.
• The serial interface (COM 1) is used only for the interface of RS232C or RS422 / 485. Wiring both
interfaces will result in failure of the HG5G/4G/3G/2G-V. Wire only the interface used.
• Note that the serial interface (COM2) can be used as the RS232C and RS422/485 interfaces at
same time.
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 RDA IN Receive Data (+) RS422/485
2 RD IN Receive Data RS232C
3 SD OUT Send Data RS232C
4 SDA OUT Send Data (+) RS422/485
5 SG - Signal Ground -
6 RDB IN Receive Data (-) RS422/485
7 RS OUT Request to Send RS232C
8 CS IN Clear to Send RS232C
9 SDB OUT Send Data (-) RS422/485
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General