| Pin | Type | Description / Signal type | Connection /
Measuring notes |
|---|
| 1 | E | Signal Handheld microphone, intercom system | Intercom control unit (WSA) |
| | | |
| 2 | E | Positive input signal, speaker | Intercom control unit (WSA) |
| | | |
| 3 | E | Signal Handheld microphone, intercom system | Intercom control unit (WSA) |
| | | |
| 4 | E | Negative input signal, speaker | Intercom control unit (WSA) |
| | | |
| 5 | E | Signal Handheld microphone, intercom system | Intercom control unit (WSA) |
| | | |
| 6 | E | Ground | Intercom control unit (WSA) |
| | | |
| 7 | E | Signal Handheld microphone, intercom system | Intercom control unit (WSA) |
| | | |
| 8 | E | Activation Handheld microphone, intercom system | Intercom control unit (WSA) |
| | | |