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Note: Not all commands apply to all models of DVR’s.
Message Format
<BOM><ID>:<Class>:<Code>[:Operands]:<Checksum>[EOM]
Where…
|
Symbol
|
Value
|
Description
|
|
:
|
:
|
Field delimiter
|
|
<BOM>
|
@
|
Beginning of message (for command)
|
|
<
|
Beginning of message (for reply)
|
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<ID>
|
00~99
|
Device ID
|
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<Class>
|
DR
|
Device Class (“DR” for DVR systems)
|
|
<Code>
|
AA~zz
|
Op-code (see below)
|
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<Operands>
|
|
Optional operands defined for each operation
|
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<Checksum>
|
00~99
|
Checksum (sum of ASCII codes before checksum discarding overflow)
|
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*
|
No checksum
|
|
[EOM]
|
^J^M
|
End of message (optional: only for convenience of users using general terminal)
|
*) All digits are used in decimal format.
*) Letters are case sensitive.
Control Flow
Every transaction consists of one command and one reply.
Characters transmitted before <BOM> are ignored.
The format of operands is defined independently for each op-code.
The <BOM> received before <Checksum> of previous message resets interpretation: i.e., discards the previous message. EXCEPTION: in case of text input, none of characters within specified length has special interpretation.
Common Reply
|
Reply code
|
Reply data
|
Description
|
|
ok
|
|
|
|
er
|
0000~9999
|
Error: return error number
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Example
Send @01:DR:FP:18:N:* (Unit ID 1 / menu button push) This is the same as pressing the menu button on the front panel of the DVR. When you finish sending the “*” you will get the response <01:DR:ok:99 at the end of the string if the DVR has received the command.
1. Front Panel Control
|
Function
|
Code
|
Operands
|
|
Digit
|
FP
|
01~16:D/U/N(down/up/down&up)[i]
|
|
Alarm
|
FP
|
17:D/U/N
|
|
Menu
|
FP
|
18:D/U/N
|
|
Display
|
FP
|
20:D/U/N
|
|
Sequence
|
FP
|
21:D/U/N
|
|
Freeze
|
FP
|
22:D/U/N
|
|
PTZ
|
FP
|
23:D/U/N
|
|
Arrow LEFT
|
FP
|
24:D/U/N
|
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Arrow UP
|
FP
|
25:D/U/N
|
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Arrow DOWN
|
FP
|
26:D/U/N
|
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Arrow RIGHT
|
FP
|
27:D/U/N
|
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ENTER
|
FP
|
28:D/U/N
|
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REC
|
FP
|
29:D/U/N
|
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STOP
|
FP
|
30:D/U/N
|
|
Search
|
FP
|
31:D/U/N
|
|
Playback
|
FP
|
32:D/U/N
|
| 
