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DigiTemp Temperature Transmitter


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The DigiTemp can be supplied headmounted in the standard thermowell type transducer fitting or as a remote sensor unit for sub zero applications. The sensor is a digital sensor which operates from -50°C to +125°C and is accurate to ±0.5°C. The transmitter output is via a RS485 interface which allows for up to 64 Digital Temperature Transmitters to be used on the same wire pair at distances up to a 1 000 m. The power supply requirements are between 10 and 30 VDC at 10 mA. The communications protocol is a simple one, consisting of the device address, the device command, a data address, the data and a checksum. This data is transmitted using standard, comma delimited ASCII text.
  • Direct digital temperature measurement -55°C to 125°C.
  • Accuracy better than ±0.5°C.
  • Cost effective wiring with up to 64 devices on one conductor pair.
  • Easy PC interface to Visual Basic, C, C++, Delphi and Turbo Pascal programs.
  • Active-X component for interface to Excel applications.
  • Customized monitoring, control and data logging systems.
  • Power requirements - 10 to 30 VDC at 10 mA.
  • RS485 up to 1 000 m.
  • Simple ASCII communications protocol.
  • Interface modules can be used to adapt for other protocols.
Interface Protocol and Commands
When communicating with the Digital Temperature Transmitter the following format must be observed:
@address, command, register, data, checksum.
@ - this character must be transmitted to signal the start of the command sequence.
address - the board address as set by SW1.3 - SW1.8, (0 to 63).
command - the command (0 to 127):
    1 Read Configuration
    2 Read Registers
    3 to 7 not used
    8 Identify All Attached
register - the register number as applicable to the respective command.
data - the data as applicable to the respective command.
checksum - the checksum is the sum of all the values (excluding the start character) modulo 216. Note that the checksum is a 16-bit number which wraps around through zero should the sum exceed 65535 i.e. if the sum of the data from the address through to data is 65537 then the checksum should be sent as 1.
All values are 16-bit except for the address and commands and have a range of 0 to 65535.
Upon receipt of any command between 1 and 2 (i.e. checksum matches and command is recognized) the Digital Temperature Transmitter will reply with a copy of the original command with the command value increased by 128 (i.e. the most significant bit is set); data is the requested data.

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