qq音乐歌单怎么都没了:RS422针脚定义！！！高手来。有加分。在线急等

应该是三菱的工控机吧?422的D25定义

DB25母头引脚定义如下：
RS-232模式：采用标准的25针串口标准，2脚（收），3脚（发），7脚（地）；
RS-485模式：采用DB25母头的14（485-），15（485+）脚；
RS-422模式：采用DB25母头的14（T-），15（T+），16（R-），17（R+）脚；

Pin Name 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

Macintosh RS-422

It's possible to connect RS-232 peripheral to the RS-422 port available on Macintosh computers. Use RXD- as RXD, TXD- as TXD, Ground RXD+, Leave TXD+ unconnected, GPi as CD.
(At the computer)
8 PIN MINI-DIN FEMALE at the computer.

Pin Name Dir Description
1 HSKo Output Handshake
2 HSKi/CLK Input Handshake or External Clock
3 TXD- Transmit Data (-)
4 GND Ground
5 RXD- Receive Data (-)
6 TXD+ Transmit Data (+)
7 GPi General Purpose Input
8 RXD+ Receive Data (+)

Information from The Hardware Book

RS422没有在DB25的标准定义，各产品制造商一般是自己决定针脚定义。

1.以下网站有三菱RS422针脚定义
http://www.fatek.cn/bbs/ccb/topic_view.cgi?forum=10&article_id=0010050322131806&publishtime_id=0010050322131806&t=0&page=30
2.一种RS422与RS232防静电转换器
http://img.b2b.hc360.com/handbook/9-9-53699.pdf