Simpson Gima Instruction Manual
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Simpson Gima Instruction Manual

Simpson Gima Instruction Manual

Modbus communications options module
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GIMA
MODBUS COMMUNICATIONS
OPTIONS MODULE
INSTRUCTION MANUAL
SIMPSON ELECTRIC COMPANY 520 Simpson Avenue
Lac du Flambeau, WI 54538-0099 (715) 588-3311 FAX (715) 588-3326
Printed in U.S.A.
Part No. 06-116937 Edition 2, 06/07
Visit us on the web at: www.simpsonelectric.com
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  • Page 1 GIMA MODBUS COMMUNICATIONS OPTIONS MODULE INSTRUCTION MANUAL SIMPSON ELECTRIC COMPANY 520 Simpson Avenue Lac du Flambeau, WI 54538-0099 (715) 588-3311 FAX (715) 588-3326 Printed in U.S.A. Part No. 06-116937 Edition 2, 06/07 Visit us on the web at: www.simpsonelectric.com...
  • Page 2 This warranty shall not apply to any instrument or other article of equipment which shall have been repaired or altered outside the SIMPSON ELECTRIC COMPANY factory or authorized service centers, nor which has been subject to misuse, neg- ligence or accident, incorrect wiring by others, or installation or use not in accord with instructions furnished by the manufacturer.
  • Page 3 5 Specifications a i l ± c i t a t l i t c t i e o i t n i t t n i y l l a i l ) s t o i t l a i t i f ) l e i s i...

  • Page 4: Table Of Contents

    Contents Modbus Diagnostics LEDs The GIMA Options Unit uses three LEDs to aid commissioning into a Modbus system. These indicators are also useful to check continued operation of the Description ..................5 device. 1.1 Available Parameters ................5 The LEDs are intelligent indicators, which are illuminated under specific condi- 2 Connecting the Options Unit ............

  • Page 5: Description

    The Options Module is available in two forms. The “Standard” unit provides access to GIMA measure parameters, which may be seen on the meter’s LCD display. Parameters not provided on a particular GIMA meter type are set to zero in the Modbus tables (refer to section 4.5).

  • Page 6: Connecting The Options Unit

    Isolate all inputs/outputs to the GIMA. Check the ratings on the options module and meter to ensure compatibility. Use a sharp knife to remove the cutout section from the rear of the GIMA. Ensure the knife blade does not penetrate more than 3mm.

  • Page 7: Operation

    Options Module replies with confirmation of the values and any requests to alter meter settings. The GIMA will confirm that it is correctly connected to an Options Module by illumi- nating the Options LED on its front panel. If for any reason the local communica- tions fail, this LED will switch off.

  • Page 8: Setting Meter Address

    Each outstation (meter) on a multi-drop Modbus system is identified to the master Description by a unique address. The GIMA may be addressed anywhere in the full Modbus This function provides a simple means of testing the communication network and range of 1-247.

  • Page 9: Data Format

    4.1.2 Data Format Host Request The device uses a fixed data format for serial communications: s t i The 8 data bits are always transmitted least significant bit first. This data byte is binary coded. The baud rate is programmable as 4800, 9600 or 19200 baud. This is carried out in programming mode as described in section 3.2.

  • Page 10: Rs-485 Connection

    4.2.1 RS-485 Connection Meter Response It is recommended that screened twisted-pair cable be used for RS-485 connec- tion in order to minimize signal errors due to noise. An optional third wire, connec- tion the common (0V) at each unit, is recommended for optimum performance. The cable screen should be connected to the connector housing (ground) at the host (PC) only.

  • Page 11: Rs-422 Connection

    The rolling demand averages of currents and voltages are available in Table 16 as unsigned integers. Note: Tables 15 and 16 are only available in GIMA meters with software ver- sions 1.04 or later. An invalid table exception will be returned on earlier meters.

  • Page 12: Modbus Protocol

    4.4.2 Remote Terminal Unit Transmission Mode The RTU mode is utilized by the GIMA Options Module because it provides the most efficient throughput of data at any particular baud rate. Notes: Use “Amps Scale” at Addr 2837 to convert to real Peak Amp In RTU mode, the start and end of each message is marked by a silent period of at Demand.
  • Page 13 The functions code is a single byte, telling the device what type of operation to Scaling factors would be as perform. Valid Modbus codes are in the range 1-255 decimal, but the GIMA Op- I Scale = 1, Vph Scale = 2, VLL Scale = 2, P Scale = 4.

  • Page 14: Cyclic Redundancy Check

    Swap the low and high order bytes of the integer result. 4.5.4.1 Instantaneous/Peak Values Instantaneous and peak measurements available for display on a GIMA are stored in Modbus Table 11-13 as Signed Integers. Parameters not available on an indi- vidual meter are returned as zero. Negative values are used for per phase/system kvar and PF readings to represent capacitive loads.

  • Page 15: Options Module Data Tables

    The Modbus standard defines data addresses using a 16-bit integer. In the case of the GIMA Options Module, the high byte of this integer represents the table number and the low byte the offset. A Modbus integer address may be calculated Notes: Use “Amps Scale”...

  • Page 16: 1Energy Registers

    (e.g. kWh or MWh). A single scaling factor is provided 999999. to enable conversion of the raw data to real numbers in basic unit form (Wh, Vah or varh). The scaling factor is a constant value calculated in the GIMA as a function 4.5.1 Table 2 Accumulated Energy Readings of CT and PT Primary programming.

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