Table G-1
Serial interface pirf functions
Pio No. | ~i::;l | Direction | Function |
| |||
1 | GND | – | Printer’s chassis ground. |
2 | TXD | OUT | This pin carries data from the printer. |
3 | RXD | IN | This pin carries data to the printer. |
4 | RTS | OUT | This is ON when the printer is ready to |
|
|
| receive data. |
5 | CTS | IN | This pin is ON when the computer is |
|
|
| ready to send data. |
6 | DSR | IN | This pin is ON when the computer is |
|
|
| ready to send data. This printer does not |
|
|
| check this pin. |
7 | GND | – | Signal ground. |
8 | DCD | IN | This pin is ON when the computer is |
|
|
| ready to send data. This printer does not |
|
|
| check this pin. |
9 | TTYTXI)R | – | This pin is the return path for data |
|
|
| transmitted from the printer on the 20mA |
10 |
|
| current loop. |
TTY TXD | OUT | This pin carries data from the printer on | |
|
|
| the 20mA current loop. |
11 | RCH | OUT | This is the signal line for the serial busy |
|
|
| protocols. This pin goes OFF when |
printer’s buffer fills, and ON when the printer is ready to receive data. In the busy protocols this line carries the same signal as pin 20.
12N/C
13GND –
17‘lTYTXDR –
I I I
18TTY RXDR –
19TTY RXD IN
20DTR o’IUT
23 TTY RXDR –
II
24 TTY TXD OUT
t,
25 TTY RXD IN
Unused. Signal ground. Unused.
This pin is the return path for data transmitted from the printer on the 20mA Icurrent loop.
This pin is the return path for data transmitted to the printer on the 20mA current loop.
This pin carries data to the printer on the 20mA current loop.
ready to receive data.
rThis pin is the return path for data transmitted to the printer on the 20mA current loop.
TTnllsed1
This pin carries data from the printer on the 20mA current looD.
This in carries data to the printer on the 20m1“ current loop.
