XLINK 500/100 Operations & Maintenance Manual page # 143
A
1
M1
Measurement M1
Be
165
June 14th
M1 day of the year of the most recent reading. For 2013, it
is June 14th.
Hq
561
09:21AM
M1 minutes into the day of the most recent reading:
9:21AM
@A
1
1 minute
M1 measurement interval in minutes.
@E|
380
3.80
M1 most recent sensor reading made at 09:21AM
@FG
391
3.91
M1 sensor reading made at 09:20AM
@FM
397
3.97
M1 oldest sensor reading made at 09:19AM
+
Delimiter for next measurement
B
Measurement M2
Be
165
June 14th
M2 day of the year of the most recent reading.
Hq
561
09:21AM
M2 minutes into the day of the most recent reading.
@A
1
1 minute
M2 measurement interval in minutes.
@@O
15
1.5
M2 sensor reading
.
Delimiter for end of measurement data
K
11
13.2V
Battery voltage (11*0.234+10.6)
15.3.
Pseudobinary D Data Format
This is another compact data format. It differs from Pseudobinary B in that it has a timestamp at
the start of the message. The timestamp indicates when the transmission should have taken
place and helps decode when the data was collected. Pseudobinary D is 4 bytes larger than
format B.
The timestamp is similar to the one in Pseudobinary C. Pseudobinary D is smaller than
Pseudobinary C, and it lacks detailed timestamps that would allow one to completely reconstruct
the time the data was collected from the message itself. To correctly use Pseudobinary D, the
decoder needs to know the measurement setup used.
The benefit of using Pseudobinary D is being able to correctly decode data regardless of when it
was sent or received. This allows stations to re-transmit old data and have it correctly
interpreted by the decoder while keeping the message size at a minimum.
Name
Bytes
Description
Block identifier
1
BLOCK-IDENTIFIER is always sent as D to indicate that this is the
Pseudobinary D format.
Group id
1
GROUP-ID can be 1 to indicate a scheduled transmission, 2
meaning an alarm transmission, 3 indicating a forced
transmission, and 4 indicating a retransmission.
Day
2
This 2 byte encoded 6-bit binary encoded (see below) number
represents the Julian day of the year. The day tells when the
transmission was originally scheduled to take place.
Time
2
This 2 byte encoded 6-bit binary encoded (see below) number is
a number of minutes into the day. It tells when the transmission
was originally scheduled to take place.