ZETRON 2000 Series Spezifikationen Seite 110

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Seitenansicht 109
Radio System
110 025-9035AA
1
RS-232 levels: -3V to -12V DC = logic “0” +3V to +12V DC = logic “1”
2
TTL levels: 0 to 0.8V DC = logic “0” 2.4 to 5.0V DC = logic “1”
3
CMOS levels: same as TTL above, except no pull-up resistor load
Co-located Radio Station
Direct cable hookup between the Zetron station card (702-9038) and a co-located radio
transmitter is used most often for local area paging such as in hospitals and industrial
plants. Such a transmitter can be a General Electric MASTR II that can even do digital
paging using a GE modulator conversion kit. The cable hookup depends upon the
particular radio station, but Figure 18 provides a basic guide.
Figure 18: Co-located Radio Stations
AUX COM/NO/NC Extra outputs activate after XMIT REQUEST and before ANA PTT or
DIG PTT. Useful as “busy” output to other control equipment sharing
the radio transmitter. Relay contacts rated 30 Volts AC/DC, 1 amp or
120 VAC, 0.5 amp.
CHASSIS GND Connected to protective chassis ground for cable shielding and RFI
protection. Not the same as signal ground.
Signal Name Purpose
AUX PTT NO
DIG DATA
DIG MODE
TX AUDIO HI
TX AUDIO LO
AUX PTT COM
GROUND
LOCAL PTT
DIG DATA
DIG RTS
AUDIO INPUT
GROUND
Station Card
(P/N 702-9039 )
Paging Transmitter
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