DPS Telecom DAC-P User Manual page 8

4
Remotes will call in to
report alarms and give
status reports at user-
specified intervals.
Since the station address may be
unknown, the DAC-P will ascertain
the unit's ID by sending a command
to address 0.
This requires that the
station address is listed in
the configuration file.
The remote's configuration
is verified and updated
every time the DAC-P
communicates with it.
The DAC-P performs a defined set of operations every time it communicates with a remote (see Figure 2):
1. Send FUDR, or full update command to station address 0.
a. Use response to ascertain actual remote address.
b. Post alarm data to MEFA displays.
2. Send DACK command to acknowledge collection.
3. If the remote has sent a power-up alarm, send TIME command and restart at Step 1.
4. Download configuration settings (whenever the DAC-P communicates with a remote, it updates the remote's configuration
with the settings in the DAC-P's own configuration file, which is derived from the TMAS database):
a. Download alive/full update time.
b. Set momentary relay period to 600 msec standard.
c. Configure all alarms as major.
Remote
Calls DAC-P
Collect Data
Map Data to
MEFA Display Grid
Configure
Remote
Disconnect
Fig. 2. DAC-P Operations Flow Chart
DAC-P Calls
Remote
Acknowledge
All Alarms
Send Pending
Control Commands
Report Data
To NTP
When Polled
The DAC-P will call if the
remote does not report at
the specified time or if a
control is to be sent to the
unit.
The DAC-P signals to the
remote that COS alarms
have been collected.
Control commands are queed
until they can be send. The
command is cancelled if
invalid or if the dial-up
connection cannot be made.