![Appendix B: INTERFACE SPECIFICATIONS](/images/new-backgrounds/141963/141963105x1.webp)
Appendix B: INTERFACE SPECIFICATIONS
Introduction
This appendix presents the interface specifications of I/O ports for the printer. These specifications include pin assignments, protocols and detailed information about how to properly interface your printer with your host or terminal.
Serial
Pin Configuration
The
Pin | Direction | Definition |
|
|
|
1 | Tied to in 6 | Not used |
2 | In | Receive Data (RxData) |
|
|
|
3 | Out | Transmit Data (TxData) |
|
|
|
4 | - | No connection |
5 | - | Logic Ground |
|
|
|
6 | Tied to pin 1 | Not used |
|
|
|
7 | Out | Request to Send (RTS) |
8 | In | Clear to Send (CTS) |
|
|
|
9 | Out | +5V |
|
|
|
Note: Pin 9 is reserved for Keyboard Device Unit (KDU) only, do not connect this pin if you are using a general host like a PC.
Connection with host: |
|
Host 25S | Printer 9P |
(PC or compatible) |
|
DTR 20 | 1 |
DSR 6 | 6 |
TX 2 | 2 RX |
RX 3 | 3 TX |
CTS 5 | 7 RTS |
RTS 4 | 8 CTR |
GND 7 | 5 GND |
Host 9S | Printer 9P |
(PC or compatible) |
|
DTR 4 | 1 |
DSR 6 | 6 |
TX 3 | 2 RX |
RX 2 | 3 TX |
CTS 8 | 7 RTS |
RTS 7 | 8 CTS |
GND 5 | 5 GND |
User's Guide 52