LX Series Digital
Chapter 2, Amplifier Assembly Description,
Power Amplifier Assembly
Maintenance & Remote Control Connections
Volume 2, Rev. 1
2-13
Table 2-6: LX Series Chassis Assembly Hard Wired Remote Interface Connections to
TB30 or TB31, which are 18 position Terminal Blocks located on the rear
of the Assembly
Signal Name
Pin
Designations
Signal Type/Description
RMT Transmitter
State
TB30-1
Discrete Open Collector Output - A low indicates that the
transmitter is in the operate mode.
RMT Transmitter
Interlock
TB30-2
Discrete Open Collector Output - A low indicated the
transmitter is OK or completes an interlock daisy chain.
When the transmitter is not faulted, the interlock circuit is
completed.
RMT Transmitter
Interlock
Isolated Return
TB30-3
Ground - Configurable ground return which can be either
jumpered directly to ground or it can be the “source” pin of
an FET so that the transmitter interlock can be daisy
chained with other transmitters. This signal does not
directly interface to the microcontroller.
RMT AUX IO 1
TB30-4
Discrete Open Collector Inputs, Discrete Open Drain
Outputs, or 0 - 5 VDC Analog Input - When used as an
output, this line is pulled to +5 VDC with a 1.0 k
Ω
resistor
for logic high and pulled to ground for a low. A diode allows
this line to be pulled up to 12 VDC. When used as a digital
input, this line considers all values over 2 Volts as high and
those under 1 volt as low. As an analog input, this line is
protected by a 5.1 Zener diode.
*RF System
Interlock
TB30-5
When this signal's circuit is completed to ground such as
through a jumper between TB30-5 and TB30-15, the
transmitter is allowed to operate. If this circuit is opened,
the transmitter switches to a Mute condition. May be used
as an external interlock with TB30-15.
RMT
Transmitter
Operate
TB30-6
Discrete Open Collector Input - A pull down to ground on
this line indicates that the transmitter is to be placed into
the operate mode.
RMT
Transmitter
Stand-By
TB30-7
Discrete Open Collector Input - A pull down to ground on
this line indicates that the transmitter is to be placed into
the standby mode.
RMT Power
Raise
TB30-8
Discrete Open Collector Input - A pull down to ground on
this line indicates that the transmitter power is to be raised.
TB30
TB31
