Advantech HMI-640S User Manual
Page 90
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HMI-640S User's Manual
HMI-640S is shipped together with a serial cable (NULL modem cable)
for customers to make a direct connection between it and the host PC.
Note that off-the-shelf NULL modem cables may not be wired correct-
ly. The following list is the wiring table for this cable:
9-pin NULL Modem Cable:
Remoet host
serial port
connector
Calling system
serial port
connector
Signal
3
2
Transmit Data
2
3
Receive Data
7
8
Request to Send
8
7
Clear to Send
6,1
4
Data Set Ready
and Carrier Detect
5
5
Signal Ground
4
6,1
Data Terminal
Ready
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