RS-422串行口定义

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		Send Data
5	ST		Send Timing
6	RD		Receive Data
7	RTS		Request To Send
8	RR		Receiver Ready
9	CTS		Clear To Send
10	LL		Local Loopback
11	DM		Data Modem
12	TR		Terminal Ready
13	RR		Receiver Ready
14	RL		Remote Loopback
15	IC		Incoming Call
16	SF/SR		Select Frequency/Select Rate
17	TT		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		Send Timing TPR
24	GND		Receive Timing TPR
25	/RS		Request To Send TPR
26	/RT		Receive Timing TPR
27	/CS		Clear To Send TPR
28	IS		Terminal In Service
29	/DM		Data Mode TPR
30	/TR		Terminal Ready TPR
31	/RR		Receiver TPR
32	SS		Select Standby
33	SQ		Signal Quality
34	NS		New Signal
35	/TT		Terminal Timing TPR
36	SB		Standby Indicator
37	SC		Send Twister Pair Common

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