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25 pin D-SUB male connector layout
25 pin D-SUB male connector
Pin Name Dir Description
1 SHIELD --- Shield Ground
2 TXD --> Transmit Data
3 RXD <-- Receive Data
4 n/c - Not connected
5 n/c - Not connected
6 DSR <-- Data Set Ready
7 GND --- System Ground
8 DCD <-- Data Carrier Detect
9 n/c - Not connected
10 n/c - Not connected
11 ? --> Reverse Channel
12 n/c - Not connected
13 n/c - Not connected
14 n/c - Not connected
15 n/c - Not connected
16 n/c - Not connected
17 TTY-TXD --> TTY Transmit Data
18 n/c - Not connected
19 n/c - Not connected
20 DTR --> Data Terminal Ready
21 n/c - Not connected
22 n/c - Not connected
23 ? --> TTY Receive Data Return
24 ? <-- TTY Transmit Data Return
25 TTY-RXD <-- TTY Receive Data
На распиновку Serial (Printer) есть 3 отзыв(а): 2 положительных и 1 отрицательных.

Эта распиновка
Источник(и) этой и дополнительной информации: Hardware Book, Petr Krc, http://www.pretich.narod.ru/Comp-soft/razyem/com.html
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