Standard printers support three host interfaces:
A printer is standard data terminal equipment (DTE), designed specifically for a direct connection to a standard data communication equipment (DCE) host. The standard signal definitions for DTE to DCE equipment are outlined in the table that follows.
Table
Pin | Signal | Function | |
Name | |||
|
| ||
|
|
| |
1 | FG | Frame or chassis ground | |
|
|
| |
2 | TD | Transmitted data | |
|
|
| |
3 | RD | Received data | |
|
|
| |
4 | RST | Request to send | |
|
|
| |
5 | CTS | Clear to send | |
|
|
| |
6 | DSR | Data set ready | |
|
|
| |
7 | SG | Signal ground | |
|
|
| |
8 | DCD | Data carrier detect | |
|
|
| |
9 |
| Positive DC test voltage | |
|
|
| |
10 |
| Negative DC test voltage (unassigned) | |
|
|
| |
11 | (S)DCD | Secondary data carrier detect | |
|
|
| |
12 | (S)CTS | Secondary clear to send | |
|
|
| |
13 | (S)CTS | Secondary clear to send | |
|
|
| |
14 | (S)TD | Secondary transmitted data | |
|
|
| |
15 | TC | Transmitter clock | |
|
|
| |
16 | (S)RD | Secondary received data | |
|
|
| |
17 | RC | Receiver clock | |
|
|
| |
18 | RDC | Receiver debit clock | |
|
|
| |
19 | (S)RTS | Secondary receive to send | |
|
|
| |
20 | DTR | Data terminal ready | |
|
|
| |
21 | SQ | Signal quality detect | |
|
|
| |
22 | RI | Ring indicator | |
|
|
| |
23 | DRS | Data rate select | |
|
|
| |
24 | (TC) | External transmitter clock | |
|
|
| |
25 | BSY | Busy | |
|
|
|
Wiring Diagrams and Electrical Data |