
Appendix C — Interfaces
Parallel Interface
| Handshake: | 
 | DSTB to printer and BUSY to host. | ||
| Printer connector: | 
 | |||
| 
 | 
 | 
 | 
 | |
| Pin | Signal Name | Transmitter | ||
| 
 | 
 | 
 | 
 | 
 | 
| 1 | 
 | Host | ||
| Data  | 
 | Host | 
 | |
| Busy | 
 | Printer | ||
| 12 | Paper empty | Printer | 
 | |
| 13 | Select | 
 | Printer | |
| Not connected | 
 | 
 | ||
| 16 | Signal ground | 
 | 
 | |
| 
 | 17 | 
 | Chassis ground | 
 | 
| 18 | + 5V DC | 
 | Max. 500 mA1 | |
| Signal ground | 
 | 
 | ||
| 31 | 
 | 
 | 
 | |
| 32 | 
 | Printer | ||
33Signal ground
1/.The combined load on the external +5V on both the parallel and the serial port must not exceed a total of 500 mA.
| 52 | EasyCoder PC4 User’s Guide |