20
Device model number (read
only)
'0E00' '01'
10 bytes “AST450C “', if less than 10 byte pad with space at end
Firmware version '1300' '01' Firmware version number of device (read only)
Sensor serial number (read
only)
'1400' '01'
6 bytes in hex, if less than 6 bytes pad with '0' at start. Only numbers
allowed.
Device type (read only)
'1301'
'01'
'0001': Single color; '0002' : Two color
'0003': Thermopile; '0004' : Reserved
Real temperature and status
code (read only)
'0000' '02'
Calculated object temperature in °K and status of sensor (As shown in
Appendix A).
First process status code then real temperature.
Batch Read (RD)command:
Byte 1: Always STX (0x02)
Bytes 2, 3: The Station Number of the device to read from (2 Hex digits)
Bytes 4, 5: The command to execute (RD)
Bytes 6-9: This is the starting address to read from. Must be 4 bytes long
Bytes 10, 11: This is the number of addresses to read. Must be 2 bytes long
Byte 12: Always ETX (0x03)
Bytes 13, 14: The checksum is the lowest 8 bits of the sum of bytes 2 through 12
Example : Read two parameters starting from address 0000, from the station number 10 (0AH). This will read addresses 0000
and 0001.
Checksum is calculated as the lowest 8 bits of the sum of the Hex codes for bytes 2 to 12.
Reply:
The reply length is L = (N * 4) + 8, Where N = the number of requested Items.
If the command is successful, the reply length will be at least 12 bytes. It consists of the STX, followed by four bytes for each
requested item, then the ETX and Checksum.
Byte
1
STX
Bytes
2, 3
Station
Bytes
4, 5
RD
Byte
L-2
ETX
Bytes
6-9
Data 1
Bytes
10-13
Data N
Byte
L-1, L
Checksum
Byte 1
1 Byte
STX
Bytes 2,3
2 Bytes
Station ID
Bytes 4, 5
2 Bytes
RD
Bytes 6-9
4 Bytes
Address
Bytes 10, 11
2 Bytes
Items
Byte 12
1 Byte
ETX
Bytes 13, 14
2 Bytes
Checksum
Byte 1
STX
0x02
Bytes 2, 3
0A
0x30, 0x41
Bytes 4, 5
RD
0x52, 0x44
Bytes 6-9
0000
0x30,0x30,0x30,0x30
Byte 13, 14
2E
0x32, 0x43,
Byte 12
ETX
0x03
Bytes 10, 11
02
0x30, 0x32
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