AC56 Standard configuration prior to June 2004
The AC56 is almost identical to the AC55. The only difference is that the AC55 has a link
between pins 4 and 9 of each input making the +5 volt supply available on both pins. Some
Barcode scanners and other peripheral devices are already wired to accept a power source on Pin 9.
AC56: Input 1, DB9 male
| Pin | Signal | Notes |
|---|
| 1 | o/c | Not connected |
| 2 | RxD | Data coming from device and entering Mux for onward transmission to Host. |
| 3 | TxD | Optional return data path from Mux to device. Not connected unless jumper link is fitted. Default is not fitted |
| 4 | DTR | Provides + 5v DC at up to 300mA to power devices |
| 5 | GND | Common data ground |
| 6 | DSR | Not connected |
| 7 | RTS | RS232 handshake line output. Permanently enabled (Wired to +12v via 1k resistor) |
| 8 | CTS | Not connected |
| 9 | o/c | Not connected |
AC56: Input 2, DB9 female
| Pin | Signal | Notes |
|---|
| 1 | o/c | Not connected |
| 2 | RxD | Data coming from device and entering Mux for onward transmission to Host. |
| 3 | TxD | Optional return data path from Mux to device. Not connected unless jumper link is fitted. Default is not fitted |
| 4 | DTR | Provides + 5v DC at up to 300mA to power devices |
| 5 | GND | Common data ground |
| 6 | DSR | Not connected |
| 7 | RTS | RS232 handshake line output. Permanently enabled (Wired to +12v via 1k resistor) |
| 8 | CTS | Not connected |
| 9 | o/c | Not connected |
AC56: Jumper Links and Data Switch
 AC56: View inside case
Summary
- Jumper Link Channel 1: Open. Backward data path disabled
- Jumper Link Channel 2: Open. Backward data path disabled
- Data Switch: Away from Power Socket. Data injected into Host/Terminal pin 3 circuit.
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