As an example of a negative value, the datalogger returns BF 82 0C 49 HEX.

Data byte 1 = BF HEX.

Data byte 2 to 4 = 82 0C 49 HEX (or 8522825 decimal).

Data byte 1 is converted to binary to find the Sign. BF HEX = 10111111 BINARY.

The most significant bit is 1 so the Sign is

NEGATIVE.

The exponent is found by subtracting 40 HEX from the remaining least significant bits. Converting the binary to hexadecimal, 111111 BINARY = 3F HEX (or 63 decimal).

3F - 40 HEX = FF FF FF FF FF HEX. Or in decimal: 63 - 64 = -1.

Exponent is -1 decimal.

The binary representation of Data bytes 2 to 4 is: 10000010 00001100 01001001.

Summing all the fractional values: 2-1+ 2-7+ 2-13+ 2-14+ 2-18+ 2-21+ 2-24= 0.50800.

Using the estimate method to find the Mantissa = 82 0C 49 HEX / 1 00 00 00 HEX (or 8522825 / 16777216) which is 0.50800 decimal.

The value is then (-)0.508*2-1which equals -0.254.

As an example of a positive value, the datalogger returns 44 D9 99 9A HEX.

Data byte 1 = 44 HEX.

Data byte 2 to 4 = D9 99 9A HEX (or 891290 decimal).

Data byte 1 is converted to binary to find the Sign. 44 HEX = 01000100 BINARY.

NOTE: Don’t lose the leading zero!

The most significant bit is 0 so the Sign is

POSITIVE.

APPENDIX C. BINARY TELECOMMUNICATIONS

The exponent is found by subtracting 40 HEX from the remaining least significant bits. Converting the binary to hexadecimal, 1000100 BINARY = 44 HEX (or 68 decimal).

44 - 40 HEX = 4 HEX. Or in decimal: 68 - 64 = 4.

Exponent is 4 decimal.

The binary equivalent of Data bytes 2 to 4 is: 11011001 10011001 10011010.

Summing all the fractional values:

2-1 + 2-2+2-4 + 2-5 + 2-8 + 2-9 + 2-12 + 2-13 + 2-16 +

2-17+ 2-20+ 2-21+ 2-23= 0.85000.

Using the estimate method to find the Mantissa = D9 99 9A HEX / 1 00 00 00 HEX (or 14260634 / 16777216) which is 0.85000 decimal.

The value is then (+)0.85*24 which equals 13.60.

If appropriately requested by a J command, Final Storage data, if any, will immediately follow the input location data. Refer to the datalogger manual for a description of how to decode Final Storage data in CSI's binary data format. Final Storage data will be limited to not more than 1024 bytes per K command.

The K command data is terminated with 7F 00 HEX (a unique binary format code) followed by two signature bytes. Refer to the datalogger manual for the meaning and calculation of the signature bytes. The signature in this case is a function of the first time byte through the 7F 00 HEX bytes. Calculate the signature of the bytes received and compare with the signature received to determine the validity of the transmission.

C.2 FINAL STORAGE FORMAT

CR10 data is formatted as either 2 byte LO Resolution or 4 byte HI Resolution values. The first two bytes of an Output Array contain a unique code (FC Hex) noting the start of the Output Array and the Output Array ID, followed by the 2 or 4 byte data values. At the end of the data sent in response to the telecommunications F command a 2 byte signature is sent (see below).

C-3