User Manual

Point Six, Inc. 2333 Alumni Park Plaza - Lexington, KY - 40517- http://www.pointsix.com - 859-266-3606 - Fax [phone]
2
Packet Description
“MultiAnalog” (75/76)
IDSSSSSSSSnnrraaaaAAAACCCCKK<CR>
Note: All fields are in ASCII Hex
“ID”
The device type field: MultiAnalog has device type 76 hex. A 75 hex when in service mode.
“SSSSSSSS”
The MS-30 bits of these 4-bytes are the serial number of the MultiAnalog device. The LS-2 bits are
set to zero.
“nn”
The number of I/O points (1 byte field: 1 or 2).
“rr”
This 1 byte field is not used and contains generic 00 data.
“aaaa”
This is the first analog data field and is populated when the number of I/O points is 2. This field is
signed 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 –32768 to 32767. This is a general purpose field and may contain 8 bit or 12 bit
data.
“AAAA”
This is the first analog data field and always exists. This field is signed 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 –32768 to 32767.
This is a general purpose field and may contain 8 bit or 12 bit data.
“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>.
1 Channel Example:
766035501C0100052708104CBEC6
SN = 6035501CH ; No of I/O = 01H; Channel1 = 0810H = 6.3%; CRC16 =44CBEH; C6 - Checksum