计算机侧 RS-422 串行接口的插口是 25 针公插：
设备侧 RS-422 串行接口插头是 25 针母插：
引脚定义
PIN
Name
Dir
Description
1
GND
ShiELD Ground
2
SRI
Signal Rate InDICator
3
n/c
-
Spare
4
SD
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Send Data
5
ST
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Send Timing
6
RD
Receive Data
7
RTS
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Request To Send
8
RR
Receiver Ready
9
CTS
Clear To Send
10
LL
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LOCal Loopback
11
DM
Data Modem
12
TR
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Terminal Ready
13
RR
Receiver Ready
14
RL
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Remote Loopback
15
IC
Incoming Call
16
SF/SR
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Select Frequency/Select Rate
17
TT
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Terminal Timing
18
TM
Test Mode
19
GND
Ground
20
RC
Receive Twister-Pair Common
21
GND
Spare Twister-Pair Return
22
/SD
Send Data TPR
23
GND
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