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Operation
025-9209K
30
Radio System
A radio stuck in transmit for any reason (PTT held in,
electronic failure, chattering PTT, etc.) will prevent or
interfere with other transmissions. Radios should provide a
PTT timer that prevents continuous transmission for
extended periods, usually three minutes. This only helps if
the radios are functioning properly. It will not prevent all
cases of transmit lock-out.
RS-232
Transmit or receive data failure will cause loss of
communications between the PC and the Controller. This
will cause communications failure states at all RTUs and the
Controller.
Buffering
If communications fail, the Controller will buffer 200 bytes,
a minimum of 10 messages. After the buffer is full, the
controller will stop acknowledging the RTUs and a critical
system communications fail status will occur.
Ground
Poor grounding or no common signal ground can cause
intermittent communications. A power cycle may appear to
cure this situation for short periods of time.
Critical System Failures Summary
Critical system failures can be caused by any of the following conditions:
•
Chattering input causing repeated transmissions
•
Radio stuck in transmit due to:
PTT held on by RTU, user, or radio failure with no timeout
Radio locked in transmit due to radio failure
Carrier from another radio system causing interference
Hardware/firmware failure causing chattering PTT
•
Repeater down
•
Controller radio down with no standby or backup
•
Controller is down due to:
COR stuck active
Power failure
Equipment failure
Hardware/firmware failure causing chattering PTT
•
RS-232 connection to Controller is down
•
PC or software failure
Содержание 1708
Страница 1: ...Models 1708 and 1716 Remote Terminal Units Installation and Operation Manual 025 9209K...
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...