Serial Interface Specifications - AMT Datasouth Accel-7350 Service Manual

Printer Output Signal Levels
All the signals used in the printer are in the TTL levels.
"HIGH" level: +2.4 to 5.0 [V], "LOW" level: 0 to 0.4[V]
Measured at input terminals of the printer.

Serial Interface Specifications

Cable Side Connector
Printer Side Connector
PIN
1 CHASSIS GND
2 TXD
3 RXD
4 RTS
5 CTS
6 NC
7 SIGNAL GND
8 NC
9 NC
10 NC
11 NC
12 NC
13 NC
Notes: (1) NC stands for no connection.
(2) CHASSIS GND and GND are connected in the printer.
25-pin (male type)
25-pin (D-sub connector (female type)
SIGNAL IN/OUT
OUT
IN
OUT
IN
PIN SIGNAL
14 NC
15 NC
16 NC
17 NC
18 NC
19 NC
20 DTR
21 NC
22 NC
23 NC
24 NC
25 NC
IN / OUT
OUT
13