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Operation
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Power
Brown Power
There is a low power reset circuit in the RTU which will
disconnect power when supply voltage drops below 9.35
volts ±5%.
Power Up Conditions
The RTU performs a self-test on power up. If there are
errors detected during the self-test, operation is suspended.
The digital and analog output states are designed to be in a
high impedance and 0 V
dc
state respectively. If the self-test
fails, these default values may not be valid.
Radio Connections and Associated Problems
Loss of transmit or receive audio anywhere along the communications path (repeater, radio,
connector or RTU) will cause a communications failure at both the RTU and Controller.
Carrier Detect
Failed Connection - If the carrier detect fails, the RTU will
transmit at will or be inhibited from transmitting.
Transmitting at will increases the risk of collisions. Never
transmitting causes a communications failure alarm at the
Controller and a communications failure state at the RTU.
Push to Talk
If Push to Talk fails, the radio will either transmit no data or
be locked in transmit and block all other transmissions on
the channel. There are jumper settings to provide proper
default open or closed conditions for power off and standby
for most radios.
Transmit Request
Failed Connection - If the transmit request line is
disconnected, collisions with the RTUs sharing the same
radio may increase. If the transmit request line is shorted,
this will cause a communications fail alarm at the Controller
and a communications fail state at the RTU.
Addressing
DIP Switch Failure
- If an RTU has a DIP switch failure
causing a change in address, there is no provision for the
Controller to recognize the error other than to show a
communications failure for the old address. Data sent by the
new address has the potential to false the data of another
RTU at the same address.
If there is a DIP switch failure causing a change in address,
the Controller will not be able to communicate with the
RTUs and possibly the PC.
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Страница 8: ...Contents 025 9209K 8...
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Страница 60: ...Repair 025 9209K 60 MODEL 1700 SERIES ENCLOSURE OUTLINE 024 0057B...
Страница 61: ...Repair 025 9209K 61 MODEL 1700 SERIES ENCLOSURE INSTRUCTIONS 024 0056D Sheet 1 of 2...
Страница 62: ...Repair 025 9209K 62 024 0056D Sheet 2 of 2...
Страница 63: ...Repair 025 9209K 63 MODEL 1708 REMOTE TERMINAL UNIT SILKSCREEN 702 9439F...
Страница 64: ...Repair 025 9209K 64 MODEL 1716 REMOTE TERMINAL UNIT SILKSCREEN 702 9440F...
Страница 72: ...Appendix B 025 9209K 72...
Страница 80: ...Glossary 025 9209K 80...