The following details wiring for an RC-220 including optional power injection on pins 6 and 7.
DigiCart Serial Port Pinout
Pin Number Signal
1 Ground (RC-220 alternate DC power ground)
2 +5 Volts (Not normally used)
3 Ground (RC-220 alternate DC power ground)
4 TX+ (This is Rx+ on the RC-220)
5 TX- (This is Rx- on the RC-220)
6 HSK Out (Not normally used)(RC-220 alternate +9 volt DC power)
7 HSK In (Not normally used)(RC-220 alternate +9 volt DC power)
8 RX+
9 RX-
The maximum length of the cable is 1200 meters or 3936 feet. Terminate the Rx+ and Rx- on each end of the cable with 1K resistors to ground if you are running over fifty feet of cable.
Pins 6 and 7 are used to inject power into the RC-220 as an alternative to the rear panel power input. The center pin of an inline female coax connector is tied to these pins at the DigiCart end of the cable. Both lines are used to minimize voltage drop. Pins 6 and 7 are left open on the DigiCart end of the cable. The outside of the coax connector connects to ground on pins 1 and 3, which are carried through from the DigiCart to the RC-220. This power injection cable can be no more than 25 feet long, but it can be placed at the end of a longer cable run.
The following details the 15 pin connection, which is not normally used with the RC-220:
DigiCart/E Remote Control cable pinout
| DigiCart/E
15 Pin D-Sub male SIGNAL |
RC-320 9pin D Sub female |
|
| 1 | GND | 1 |
| 2 | +5 VOLTS (Not normally used) | 2 |
| 3 | GND | 3 |
| 4 | TX + (DigiCart Transmitter, wire to RX+) | 4 |
| 5 | TX – (DigiCart Transmitter, wire to RX-) | 5 |
| 6 | Remote Present Return (Not Used) | |
| 7 | +12V | 6 |
| 8 | GND | |
| 9 | N/C | |
| 10 | N/C | |
| 11 | RX + (DigiCart Receiver, wire to TX+) | 8 |
| 12 | RX – (DigiCart Receiver, wire to TX-) | 9 |
| 13 | Remote Present signal (Not Used) | |
| 14 | +12V | 7 |
| 15 | GND |
ALSO – Connect Pin 15 to Pin 1 and Pin 8 to Pin 3 on 15 pin connector side
| PIN | SIGNAL |
| 1 | GND |
| 2 | +5 VOLTS (Not normally used) |
| 3 | GND |
| 4 | TX + (DigiCart Transmitter, wire to RX+) |
| 5 | TX – (DigiCart Transmitter, wire to RX-) |
| 6 | Remote Present RTN |
| 7 | +12V |
| 8 | GND |
| 9 | N/C |
| 10 | N/C |
| 11 | RX + (DigiCart Receiver, wire to TX+) |
| 12 | RX – (DigiCart Receiver, wire to TX-) |
| 13 | Remote Present signal |
| 14 | +12V |
| 15 | GND |