T2004 Multi-Control Head System Manual Circuit Description 37© Tait Electronics Limited May 2004PowerThe control head is supplied with 13.8V from an AC to DC plug pack.The remote power switch line J5-3 (controlled by the Primary control head)controls the 5V regulators on the Secondary heads and interface board.DataA separate RS-485 transmitter and receiver in each control head provide thedata communications between the radio and control heads.ConnectionsConnection to the remote control heads is via the micromatch to RJ45 cableat J5, which connects to the RJ45 Wallbox. The wallbox connects to themulti-drop cable, which connects to the RJ45 Wallbox for each controlhead and the radio.DC Input and speaker output is via a 4 way phoenix connector at J6. Thesupplied cable 219-02907-00 connects to J6. The plug pack (suppliedseparately) connects to this cable assembly.The DC input is polarity protected so that in the event of reverse polaritybeing applied the head will not function, no damage will occur.