ZETRON 2000 Series Specifications download pdf (Page 109)

109

Radio Signal Descriptions

Signal Name Purpose

RECV AUDIO HI & LO Input audio from radio receiver 600W balanced audio, transformer

coupled (for talkback and 2-way)

DIG MODE Output tells radio to key up in digital mode, RS-232 voltage level,

polarity set in oparam.cds file

XMIT REQUEST Output indicates terminal would like to use radio, RS-232 voltage level,

polarity set in oparam.cds file

XMIT AUDIO HI & LO Output audio to radio transmitter (tone/voice/modem) 600W balanced

audio, transformer coupled

COR/CAS Input from radio, keeps paging terminal from using radio transmitter

until “channel is clear” Usually connected to radio COR or CAS signal.

Also can be used as Clear to Send Analog input from a TX link

controller such as PURC PSC/SSC TTL, RS-232, CMOS level

compatible. Jumper selected polarity.

BUSY Input from other paging equipment sharing the radio, keeps paging

terminal from using radio transmitter. Paging terminal will stop

transmitting at end of current paging batch if other equipment requires

radio. Also can be used as Clear to Send Digital input from a TX link

controller such as PURC PSC/SSC TTL, RS-232, CMOS level

compatible. Jumper selected polarity.

GROUND Signal ground, used with signals DIG MODE, XMIT REQUEST,

COR/CAS, BUSY, DIG DATA, ZONE ADR 1/2/4/8. Not the same as

chassis ground.

DIG DATA Output carries binary-digital paging data RS-232 voltage level.

Programmable polarity in oparam.cds file. See Modifications for TTL

Data Signal Levels on page 111, for advice on converting output signal

to TTL levels.

ANA PTT COM/NO/NC Output indicates analog paging audio is being sent to the radio

transmitter. Also can be used as Request to Send Analog output to a TX

link controller such as PURC PSC/SSC. Relay contacts rated 30 Volts

AC/DC, 1 amp or 120 VAC, 0.5 amp.

DIG PTT COM/NO/NC Output indicates digital paging data is being sent to the radio transmitter.

Also can be used as Request to Send Digital output to a TX link

controller such as PURC PSC/SSC. Relay contacts rated 30 Volts AC/

DC, 1 amp or 120 VAC, 0.5 amp.

ZONE ADR 8/4/2/1 Outputs indicate radio RF paging zone selected, along with XMIT

REQUEST to look at whether selected zone is busy or clear on XMIT

REQUEST. Zone is coded in binary bits 8, 4, 2, and 1. (example: 8/4/2/

1 = On/Off/Off/On is Zone #9) Each signal is open collector with pull-up

resistors to 5 volts; able to sink 40 mA to signal ground to drive relays or

a TX link controller. Signal from zero to 0.8VDC, means logic “1” (On).

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ZETRON 2000 Series Specifications Page 109

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