Communications Port
| Signal |
|
|
Pin# | Name | Type | Description |
1 | RXD | input | Receive Data |
2 | TXD | output | Transmit Data |
3 | CTS | input | Clear To Send from host |
4 | RTS | output | Request To Send |
|
|
| set high when printer |
|
|
| is ready to accept command |
|
|
| /data |
5 | GND |
| Ground |
6 | NC |
| No Connect |
7 | DSR | input | Data Set Ready |
|
|
| low to high transition turns |
|
|
| printer on, high to low |
|
|
| transition turns printer off |
|
|
| (if enabled) |
8 | DTR | output | Data Terminal Ready |
|
|
| set high when printer is on |
|
|
| |
|
|
| (set to battery voltage for |
|
|
| “S” versions) |
|
|
|
|
2
5
4 
1 
3
6 | 7 |
8
FIGURE 19 COMMUNICATIONS PORT
(8 pin Circular DIN)
QL 320 User’s Guide | 41 |