WX16 User Manual | 51
24-Hour Trend Database
The 24 hour MAX, MIN and AVERAGE trend data may be retrieved over the ModBus serial interface. Each
channel consists of 240 MAX, MIN and AVERAGE values, or, one value for every 1/10 hour (6 minutes). Since
there are 16 channels this database equals 3,840 registers in addresses 33017-36857. Due to the large size,
MAX, MIN or AVERAGE values may only be retrieved one at a time. To improve bandwidth, the master may
retrieve the database in blocks of 120 registers at a time (one half of a channel’s data). The C1 only updates
these 3,840 registers upon receiving an update command from the ModBus master.
Type Channel
First
Last
Read
FC
Write
FC Notes
Update MIN
n/a
2065
n/a
n/a
5
Moves 24-hour MIN data
trend to trend data base
Update AVG.
n/a
2066
n/a
n/a
5
Moves 24-hour MIN data
trend to trend data base
Update MAX
n/a
2067
n/a
n/a
5
Moves 24-hour AVG data
trend to trend data base
This update requires several seconds. Therefore, a data ready register is available to notify the master upon
completion.
Type Channel
First
Last
Read
FC
Write
FC Notes
MIN Ready
n/a
12065
n/a
2
n/a
0 = data ready;
1 = update in progress
AVG. Ready
n/a
12066
n/a
2
n/a
0 = data ready;
1 = update in progress
MAX Ready
n/a
12067
n/a
2
n/a
0 = data ready;
1 = update in progress
Trend database registers
Type Channel
First
Last
Read
FC
Write
FC Notes
24-hr Trend
1-16
33017
36857
5
n/a
Transfers 24-hour trend
for MAX, MIN or AVG.
Summary of Contents for WX16
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