Serial Connection
Note: The serial cable connections described in this section are only compatible with the Serial version of GNSS Compass, part number GC2-SER.
The Serial connection is used to provide the power supply and access to a range of interface connections. It can be achieved with a Serial Unterminated Cable, a Serial Breakout Cable or by building your own cable (see Custom Serial Termination). Connection is made through a Holin C-Size 18 pin connector.
Serial Breakout Cable
The serial breakout cable part number is GC-SER-BREAK-20M. The cable contains 4 female DB9 connectors and a 2.1 x 5.5mm DC connector. The cable assembly is supplied with 20 metres of UV stable shielded cable. Each individual wire is colour coded 26AWG wire. These connectors are not environmentally sealed.
Serial Breakout Cable
Given below are details of the Serial breakout cable connections.
| Function | Primary | Auxiliary | CAN | 1PPS | Power |
|---|---|---|---|---|---|
| Power Supply | Tip | ||||
| Power Ground | Ring | ||||
| Primary RS422 Tx(+) / RS232 Tx | 2 | ||||
| Primary RS422 Tx(-) | 8 | ||||
| Primary RS422 Rx(+) / RS232 Rx | 3 | ||||
| Primary RS422 Rx(-) | 7 | ||||
| Auxiliary RS422 Tx(+) / RS232 Tx | 2 | ||||
| Auxiliary RS422 Tx(-) | 8 | ||||
| Auxiliary RS422 Rx(+) / RS232 Rx | 3 | ||||
| Auxiliary RS422 Rx(-) | 7 | ||||
| Signal Ground | 5 | 5 | |||
| CAN Hi | 7 | ||||
| CAN Lo | 2 | ||||
| Alarm Hi | 9 | ||||
| Alarm Lo | 1 | ||||
| 1PPS Out | 2 | ||||
| Signal Ground | 6 | 5 | |||
| Drain Wire | Ring |
Serial Breakout Cable Connector Pin-out
Serial Unterminated Cable
The unterminated serial cable part number is GC-SER-CABLE-20M. The cable assembly is supplied with 20 metres of unterminated UV stable shielded cable. Each individual wire is colour coded 26AWG wire.
This cable is intended only for customers with experience in terminating shielded cable.
See Pin Allocation for details on pin out functions.
Serial Unterminated Cable
Connector pin assignment viewed from the front
Pin Allocation
| Pin | Colour | Function |
|---|---|---|
| 1 | Red | Power Supply |
| 2 | Black | Power Ground |
| 3 | Green | Primary RS422 Tx(+) / RS232 Tx |
| 4 | Green/White | Primary RS422 Tx(-) |
| 5 | Purple | Primary RS422 Rx(+) / RS232 Rx |
| 6 | Purple/White | Primary RS422 Rx(-) |
| 7 | Brown | Auxiliary RS422 Tx(+) / RS232 Tx |
| 8 | Brown/White | Auxiliary RS422 Tx(-) |
| 9 | Pink | Auxiliary RS422 Rx(+) / RS232 Rx |
| 10 | Pink/White | Auxiliary RS422 Rx(-) |
| 11 | Grey | Signal Ground |
| 12 | White | CAN Hi |
| 13 | Blue | CAN Lo |
| 14 | Orange | Alarm Hi |
| 15 | Orange/White | Alarm Lo |
| 16 | Yellow | 1PPS Out |
| 17 | Grey/White | Signal Ground |
| 18 | Bare | Drain Wire |
Pin Allocation Table
Custom Serial Termination
Whilst it is recommended to use either a breakout cable or an unterminated cable from Advanced Navigation, you can also source and build your own custom Serial cable.
Connection to the GNSS Compass is made through a Holin C-Size 18 pin connector. The Holin part number is CCN-L218SM. The connector has a bayonet lock and provides a reliable and rugged connection to GNSS Compass under demanding conditions. It is rated to IP67 in the mated state.
See Pin Allocation for details on pin out functions.