Pin | Signal | Description |
12,19 | GND ? | shorted |
13 | Tx | |
14 | Rx | |
17 | GND | at least in SKY 5100-5400 |
18 | Ring | at least in SKY 5100-5400 |
20 | RTS | at least in SKY 5100-5400 |
23 | CTS | at least in SKY 5100-5400 |
24 | DTR | at least in SKY 5100-5400 |
21?,22 | Vcc | shorted |