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Example: Set Alarm2 Low to –100.0 on Device address 20
We have to send two commands to accomplish this task.
First, we have to set decimal point into the position 2 (FFF.F) and then, set value of
Alarm 2 Low to –1000 counts (disregard decimal point).
1. Set Decimal Point
Set the Decimal point to the position 2 (FFF.F), Temperature unit ºF, Filter constant 4
- see example in 5.7.2
SEND TO DEVICE: Address 20 (Hex 14), write (06) to register 8, data 4A
DEVICE FUNCTION REGISTER DATA/ CRC
ADDRESS CODE VALUE
14 06 00 08 00 4A 8B 3A
RETURNED FROM DEVICE:
DEVICE FUNCTION REGISTER DATA/ CRC
ADDRESS CODE VALUE
14 06 00 08 00 4A 8B 3A
2. Conversion the Decimal value of (–1000) to Hexadecimal Value:
N = +1000 Dec = 0000 0011 1110 1000 Bin = 2 bytes or 16 bits
1’s complement of N = 1111 1100 0001 0111 Bin = Not N
2’s complement of N = 1111 1100 0001 1000 Bin = 1’s complement of N + 1LSB
F C 1 8 Hex
SEND TO DEVICE: Address 20 (14 Hex), write (06) to register 21 (15 Hex) value
(–1000) (FC18 Hex)
DEVICE FUNCTION REGISTER DATA/ CRC
ADDRESS CODE VALUE
14 06 00 15 FC 18 DB C1
RETURNED FROM DEVICE:
DEVICE FUNCTION REGISTER DATA/ CRC
ADDRESS CODE VALUE
14 06 00 15 FC 18 DB C1
For examples of how to Read/Write data code for INPUT, RDGCNF, ALR1CNF,
ALR2CNFG, OUT1CNF, OUT2CNF, COLOR, COMM.PARAMETERS,
BUSFORMAT, DATAFORMAT see section 5.7 of this manual.
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