Associated Equipment - Baxall ZTX3 Installation And Operating Instructions Manual

The ZTX4
The ZTX4 has 15 keys, a monitor output BNC, a camera input (telemetry output)
BNC, a 6-pin-mini-din 20mA-twisted-pair connector, a supplementary earth terminal
and a row of switches.
The ZTX4 can transmit coaxial or twisted pair telemetry. It can control pan, tilt, focus,
iris, zoom, four latching auxiliaries AUX1 (Camera power), AUX3 (Auto-pan),
AUX5 (Lamps), AUX6 (Wipe) and one momentary auxiliary AUX2 (Wash).
The switches on the back panel allow selection of old or new coaxial telemetry and 75
ohm or Hi-Z options on the camera input.
The twisted pair connector is a 6-way mini-din socket which carries the current loop
output plus an optional link which when made changes the baud rate (speed at which
the data is transmitted) from 1200 baud to 300 baud. The slower rate of 300 baud is
included to improve reception in electrically noisy environments such as near an
electrified railway track.
Fitting the 6-pin mini-din plug with pin 3 linked to pin 1 automatically disables the
coaxial telemetry and enables 20mA twisted pair telemetry.

Associated Equipment

Your ZTX can be used in many different configurations. A basic system is shown in
figure 1, this basic system includes:
• a monitor
• a VCR
• a ZTX transmitter
• a Baxall telemetry receiver (e.g. a ZR4-mini)
• a P/T head
• a CCTV camera (e.g. a Baxall CD9312 colour camera)
• a motorised lens
• BNC connectors
• coaxial cable
• twisted pair cable
• associated wiring
Figure 1 shows a system using twisted pair telemetry. A similar system using coaxial
telemetry would be the same but have all the twisted pair connections removed.
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