Ports
Serial (RS422) Port
The female DB9 serial port supports the RS-422 transmission standard.

| Pin | Signal |
|---|---|
| 1 | Ground |
| 2 | Tx- |
| 3 | Rx+ |
| 4 | Rx-Ground |
| 5 | n/c |
| 6 | Tx-Ground |
| 7 | Tx+ |
| 8 | Rx- |
| 9 | n/c |
LTC (3-Pin XLR) Port
The EIA Standard RS-297-A describes the use of the XLR3 for balanced audio signal applications.

| Pin | Signal |
|---|---|
| 1 | Ground (cable shield) |
| 2 | LTC+ / Positive (hot) |
| 3 | LTC- / Negative (cold) |
AES Audio (DB25) Port

