Bosch LTC 2380 User Manual page 41

Digital Video Quad Processor
NOTICE! Each video processor receives this command in turn. The command is mirrored
i
through all processors and does not generate a return message.
Preventing UNIT ID Collision
If more than one unit has the same UNIT ID the system experiences a clash on the Bus. It is
the responsibility of the Master Controller to identify that there are two or more units with the
same Unit ID. The LTC 2382/90 echoes each character received on its RX (receiving) line and
on the TX (transmitting) line followed by the QUAD> prompt.
For example, if you set the time on unit 050 to 23:56:00:
!ID 050 !TIME 17 38 00<CR>
and the unit responds with
!ID 050 !TIME 17 38 00<CR>QUAD>
then, the command was received by only one Video Quad processor.
If two units, however, have the same UNIT ID the echo returned to the master controller
resembles the following:
!ID 050 !TIME 17 38 00<CR>QUAD>QUAD>
The two QUAD> prompts indicate that a UNIT ID collision exists and that the operator must
change one of the colliding UNIT ID numbers.
Remote Alarm and Video Loss Status
To read the video loss and the alarm status from individual units, issue the !S command. For
example, to check the status of unit 50, issue this command:
!ID 050 !S
The unit responds with a hexadecimal Status Byte. The table below summarizes the inputs for
which you can receive information and the status byte that the input returns:
Description
Alarm Status
Video Loss/Present Status D4- Video I/P 1
Table 2.5 Remote Alarm and Video Loss Status
If the unit experiences a combination of triggered alarms and video loss alarms, the unit adds
the hexadecimal values for each bit and displays the total hexadecimal value. For example,
Alarm 3 (bit D2) and Alarm 4 (bit D3) are triggered, and Video 1 (bit D4) is in video loss on
unit ID 050. If you then issue the !S command:
!ID 050 !S
The unit returns:
QUAD> 1C
The unit arrives at the 1C hexadecimal value by adding 0x4 (status byte for bit D2), 0x8
(status byte for bit D3) and 0x10 (status byte for bit D4).
Bosch Security Systems, Inc.
Bits Status Byte
(hexadecimal)
D0- Alarm I/P 1 0x01
D1- Alarm I/P 2 0x02
D2- Alarm I/P 3 0x4
D3- Alarm I/P 4 0x8
0x10
D5- Video I/P 2 0x20
D6- Video I/P 3 0x40
D7- Video I/P 4 0x80
User's Guide
Unpacking | en 37
F.01U.090.110 | 3.0 | 2010.04