Appendix a – GAI-Tronics GC-AC1 EZ Page Industrial Intercom User Manual
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Pub. 42004-307G
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Appendix A
Interfacing an EZ Page Station to MS39xx Series RigCom Stations
The EZ Page station is designed to operate with the MS39xx Series RigCom Stations.
The MS39xx Series uses an unbalanced system for communication and uses the negative of the audio pair
as the ground reference for the control signal. The EZ Page has the ability to operate unbalanced or
balanced. In the balanced system, the audio pair is not ground referenced and the control signal requires a
ground signal with it.
For interoperability between the EZ Page and the MS39xx Series, configure the EZ Page for an
unbalanced system by placing the jumper for P5 in the UNBAL position. No changes are required to the
MS39xx Series. For Master/Slave operation, connect AUDIO– to AUDIO (WH), AUDIO+ to AUDIO
(BLK) and EXT CONT+ to KEY. For common line only the audio wires need connection.
The following are wiring diagrams for the different configurations of a system.
Figure 8. Master/Slave Configuration with EZ Page as Master