TM 11-5820-890-30-4
2-19. REMOTE CONTROL OPERATION. Continued
The remote I/O module has a self-test function. It is initiated when the RT is in remote and the BATT/CALL key
and the handset PTT switch are pressed. If self-test is passed, “CALL” will be displayed. If it is not, “ FAIL4” is
displayed.
The following signals must be present for proper remote operation. See figure FO-10.
SIGNAL NAME
DESCRIPTION
2/6 WIRE MODE
Logic 1 = 6-wire mode (control-monitor).
Logic 0 = 2-wire mode (complete remote control).
REM DDMC
Digital data mode control, logic 0 = digital, logic 1 = analog.
RADIO SQUELCH
Logic 1 indicates a received signal.
AUDIO MODULE PTT-N
PTT generated by RT.
SIDETONE DISABLE
Logic 1 disables sidetone.
40-kHz XMT DATA
Data signal from remote control unit to be transmitted by RT.
XMT REM AUDIO
Audio signal from remote control unit to be transmitted by RT.
REM
Set to logic 1 by FCTN switch.
REM 8 CLK
320-kHz clock in groups of 8. Used with 8-bit data.
REM 8 STROBE
Logic 1 pulse used with 8-bit data.
REM DATA
Remote control data to control module, both 8-bit and 24-bit.
REM 24 CLK
320-kHz clock in groups of 24. Used with 24-bit data.
REM 24 STROBE
Logic 1 pulse used with 24-bit data.
SERIAL DATA
Data from control module to be sent to remote control unit and display.
DISPLAY CLK
320-kHz clocks used with SERIAL DATA in groups of 10.
DISPLAY GATE-N
Logic 0 pulse used with SERIAL DATA.
DATA AVAIL
Logic 1 indicates data is available.
DISPLAY INHIBIT
Logic 1 turns off RT display.
REM CLR-N
Logic 0 pulse when FCTN is set to REM.
TRI-STATE EN
Logic 0 pulse when FCTN is set to REM.
40-kHz DET
Logic 1 indicates presence of 40-kHz carrier
40-kHz A/D SEL
Indicates type of signal to be modulated onto 40-kHz carrier.
Logic 1 = analog. Logic 0 = digital.
40-kHz XMT EN
Logic 1 enables 40-kHz carrier.
2880 DET-N
Logic 0 indicates presence of 2880-Hz carrier.
2880 RCV DATA
Serial input of 2880-Hz carrier.
2880 XMT EN
Logic 1
CONT FSK DATA
Data to
A/D RCV REM SEL
Logic 0
Logic 1
INTERCOM XMT EN
Logic 1
enables 2880-Hz carrier.
be FSK modulated onto 2880-Hz carrier.
= digital.
= analog.
=
intercom mode.
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