Serial (Printer) connector

#Computer#Serial Interfaces
25 pin D-SUB MALE connector pin-out & layout

25 pin D-SUB MALE connector  at the printer

PinNameDirDescription
1SHIELD---Shield Ground
2TXD-->Transmit Data
3RXD<--Receive Data
4n/c-Not connected
5n/c-Not connected
6DSR<--Data Set Ready
7GND---System Ground
8DCD<--Data Carrier Detect
9n/c-Not connected
10n/c-Not connected
11?-->Reverse Channel
12n/c-Not connected
13n/c-Not connected
14n/c-Not connected
15n/c-Not connected
16n/c-Not connected
17TTY-TXD-->TTY Receive Data
18n/c-Not connected
19n/c-Not connected
20DTR-->Data Terminal Ready
21n/c-Not connected
22n/c-Not connected
23?-->TTY Receive Data Return
24?<--TTY Transmit Data Return
25TTY-RXD<--TTY Receive Data

Serial (MSX) connector

Serial (SGI MiniDIN) connector