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 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 + |