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Operation
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Channel Busy Detect
To identify when the channel is in use, the carrier must be set to inhibit transmission on
either
High
(+5 or open) or
Low
(0 V). The level entered here will PREVENT transmission.
For trunked operation, this is used the same way to inhibit transmission. The proper name for
this parameter should be “channel-acquired indication” when a trunked system is being used.
Channel Busy Timeout
Enter the amount of time (in tenths of seconds) that the channel has to be available before the
RTU can seize the channel. This can prevent the RTU from interrupting a conversation.
For trunked operation, this is used to determine that the TX indicator has stopped flashing
(requesting a channel) and is on long enough to verify that the channel has been acquired.
(This is only if you are using the TX indicator to provide the channel-acquired signal.)
Transceiver Type
This lets the user select whether the RTU is to be used on a conventional or trunking radio
system. The difference being that in trunking, you request a channel by giving PTT and in
conventional, you first look to see if the channel is available before giving PTT.
For trunked operation timing, PTT is pressed for 15 seconds while looking for a channel. If a
channel is acquired prior to the 15 seconds (this is based on the logic indication on the COR
input), the RTU will wait the Prekey delay, send the data, and release PTT. After 15 seconds,
if no channel is available, the RTU will release PTT, wait 30 seconds, and retry.
Address Extension
If you have more than 255 RTUs, enter the number to be added to the dip switch address for
this RTU. It is suggested that you enter a multiple of 256 (256, 512, 768, 1024 etc.) and use
this same number for the rest of the extended address RTUs (up to 255). Record this number
on the sheet provided on the inside top cover of the RTU.
Controller Address
Enter the address of the unit that is to receive alarms from this RTU. The default is the
Controller address 0.
Group Call Address
The Group Call Address allows outputs on several RTUs to be controlled in a single
transmission from the Model 1700 Controller. When the controller sends an output control
command to a group call address, all RTUs in the group will execute the command, but will
not send back a response (in the case of momentary outputs, each RTU makes an exception
report when the output returns to its idle state). Since the RTUs do not send response
messages, the group call address cannot be used to poll inputs or outputs.
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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...