User Manual

Point Six, Inc. 2333 Alumni Park Plaza - Lexington, KY - 40517- http://www.pointsix.com - 859-266-3606 - Fax [phone]
4
Packet Description
“Humidity2” (51/52)
IDSSSSSSSSnnrrhhhhttttCCCCKK<CR>
Note: All fields are in ASCII Hex
“ID”
The device type field: Humidity2 has device type 52 hex. A 51 hex when in service mode.
“SSSSSSSS”
The MS-30 bits of these 4-bytes are the serial number of the Humidity2 device. The LS-2 bits are set
to zero.
“nn”
Always “00”.
“rr”
This 1 byte field is not used and contains generic 00 data.
“hhhh”
This is the humidity data field. This field is 16 bits stored MSB first (bits 15-8) and LSB last (bits 7-0)
from left to right. This field has a possible range of 0 to 4095 where 0 is 0 %R and 4095 is 100 %RH
“tttt”
This is the temperature data field. This field is 16 bits stored MSB first (bits 15-8) and LSB last (bits
7-0) from left to right. This field has a possible range of 0 to 4095 where 0 is –40 degC and 4095 is
80 degC.
“CCCC”
This field is the CRC-16 error check as was originally received and checked. This CRC is over the
first 11 bytes of the packet starting with the device type and ending with but not including CRC-16.
“KK”
This field is the mod 256 sum of all the binary data values as represented by the ASCII hex values in
the response but does not include the <CR>.
Example:
526035700402000625085249D1FC
SN = 60357004H ; Humidity = 0625H = 38.4%RH ; Temp = 0852H – 22.4 degC; CRC16 =49D1H; FC
- Checksum
51603570040200060A084CF7540B