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Instruction 21 (Power Supply Status Request Reply)
Message
Byte No.
1
2
3
4
5
6
8
9
10
14
15
16
18
35
36
Instruction 21 (System Status Request Reply)
This message should only be used with units with the mute option fitted.
Message
Byte No.
1
2
3
4
5
6
7
8
13
14
Issue 3.20
Set Value /
(example)
02
?
?
21
'P'
'01'
'-'
'.'
'....'
'0'
'0'
'..'
('23/12/02 12:34:56')
?
03
Set Value /
(example)
02
?
?
21
'S'
'M'
'M'
'.....'
?
03
DBUH / DLAH / DTLH Installation and Operation Handbook
Length
(bytes)
1
STX
1
No of bytes in message
1
Address
1
Message instruction
1
Power supply
2
Power supply number
'01' = PSU 1
'02' = PSU 2
1
Power Supply Present
'X' = Missing '-' = Present
1
NOT USED
4
NOT USED
1
Summary Alarm
'0' = OK '1' = FAULT
1
Power Supply Missing
'0' = OK '1' = FAULT
2
NOT USED
17
OK Since time/date string, if there is a
fault then the string is blank.
1
Checksum
1
ETX
Length
(bytes)
1
STX
1
No of bytes in message
1
Address
1
Message instruction
1
Power supply
1
Wanted mute status
'U' = Unmuted
'M' = Mute
1
Actual mute status
'U' = Unmuted
'M' = Mute
'?' = Unknown
5
NOT USED
1
Checksum
1
ETX
Description
Description
Page 17
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