The modular sensor and zone bus ports on the face of the controller are RJ-12, six-position, modular jacks. The modular system bus and modular sensor bus port’s provide a connection for the VAV Balancing Tool. The zone bus port is not used in ZEC/BYP controller installations. The zone bus port is not used in ZEC/BYP controller installations. The following figure shows the pin number assignments on the modular port.
Figure 1. Pin number assignments
| Pin number | Description |
|---|---|
|
1 |
Power 15 VDC |
|
2 |
Bus and power common |
|
3 |
Power 15 VDC |
|
4 |
Bus and power common |
|
5 |
Sensor or zone bus - |
|
6 |
Sensor or zone bus + |