SDI-12 Protocol Converters and Testers

Models 6543A, 6412A & 6411C

  • Overview

    Protocol Converter Model 6543A
    The model 6543A Protocol Converter converts Modbus to SDI-12 requests or converts HSIO data to Modbus data. This allows Unidata dataloggers and third party SDI-12 sensors to be integrated into process control (PLC, SCADA) systems. Modbus data is in RTU format. Modbus communications are via RS232 or RS485.

    Modbus to SDI-12 Conversion:
    The model 6543A Protocol Converter acts as a Modbus slave on a Modbus RTU bus. On receipt of certain Modbus commands the Protocol Converter module initiates SDI-12 commands, awaits the response and returns the results as Modbus values. The data returned is selectable as either a binary decimal values with a sign delimiter or an IEEE 32bit floating point values.

    Modbus to HSIO Conversion:
    The 6543A Protocol Converter can also act as a HSIO slave on the HSIO connection from a UNIDATA data logger or Starflow. On receipt of HSIO data the Protocol Converter module stores the HSIO data into memory. On receipt of certain Modbus commands, the Protocol Converter returns the requested memory values as Modbus values. The data returned is an exact representation of the HSIO value/s received.

    SDI-12 Tester Model 6412A
    The SDI-12 Tester is a portable unit which simplifies the set up and fault finding of SDI-12 sensors in the field and on the laboratory bench. It allows sending a variety of commands enabling sensors to be configured and read. It also enables monitoring communications between a logger and sensors(s) on an SDI-12 bus.
    The unit has the following functions: monitor bus, query address, acknowledge active, change address, send identification, start measurement, send data, send extended command and cyclical measure & send data.
    6412A SDI-12 tester has also been tested using the NR Systems SDI-12 verifier.

    To find SDI-12 communication protocol specifications please visit : SDI-12 Support Group or view Unidata white paper: SDI-12 Serial Digital Interface Standard

    SDI-12 Dual Listener Model 6411C
    This device assists with integration projects where you may wish to have both a Starlogger and a neon remote Terminal use the same SDI-12 bus.

    Normally two SDI-12 masters on the same bus will cause problems, but with this device a master logger can control all SDI-12 communications activity, but if that logger fails, the secondary logger for example, a Neon remote Terminal, can assume command of the SDI bus and can allow the operation of the system to continue in the event of failure.

    starlog dataloggers Interfaces protocol converter 6543A
    SDI-12 Test unit
    starlog dataloggers Interfaces SDI-12 listener 6411A-SDI

  • Specifications

    Protocol Converter Model 6543A
    Connections:
    RS232 D9 Socket;
    RS485 Terminal Block;
    DC Power Terminal Block
    Power Supply: 5 to 24 V DC @ 14mA-active
    Housing Size (LxWxD): 140 x 80 x 65mm
    Housing Type: Polycarbonate Enclosure – IP67
    Operating Temperature: 0˚C to 50˚C (32˚F to 122˚F)
    Storage Temperature: 10˚C to 60˚C (50˚F to 140˚F)
    Weight: 250g

    SDI-12 Tester Model 6412A
    Power Supply: PP3 9V Alkaline
    Housing Size (LxWxD): 170 x 80 x 30mm
    Housing Type: Fire retardant ABS Enclosure – IP61
    Operating Temperature: 5˚C to 55˚C (41˚F to 131˚F)
    Weight: 250g

  • Ordering Information

    ModelDescription
    6543AProtocol Converter
    Modbus to SDI-12 requests OR converts HSIO data to Modbus data
    6412ASDI-12 Tester
    6411CSDI-12 Dual Listener

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  • Documents

    Application Notes
    Not applicable.