Serial Port Pin Assignment - Mita DP-2800 Service Manual

5A2

Serial port pin assignment

The pins of the parallel interface connector carry the signals listed below. The RS-422A
specific signals are noted in the Definition .
No. Signal
1 FG
2 TxD
3 RxD/RDA
4 RTS
5 CTS
6 DSR
7 SG
9 SDA
10 SDB
11 +5 V DC
18 RDB
20 DTR
Others Not connected
A-6
Flow
— Frame ground
Printer → host
Transmit data: RS-232C
Host → Printer
Receive data/receive data (Reversed)
Printer → host
Transmit request
Host → printer
Transmit permitted
Host → printer
Data-set-ready
Signal ground
Printer → host
Transmit data (Reversed): RS-422A
Printer → host
Transmit data: RS-422A
— Peri-logic power
Host → printer
Receive data: RS-422A
Printer → host
Data-terminal-ready
— Undefined
Definition