Table Of Contents - Simpson Gima Instruction Manual

Contents
1 Description ...................................................................................... 5
1.1 Available Parameters ............................................................................ 5
2 Connecting the Options Unit ............................................................ 6
3 Operation ........................................................................................... 7
3.1 Local Communications (Meter-Options Module) ............................... 7
3.2 Programming ........................................................................................ 7
3.2.1 Setting Baud Rate ................................................................................... 7
3.2.2 Setting Meter Address ............................................................................ 8
4 Modbus Communication ................................................................... 8
4.1 Description ............................................................................................ 8
4.1.1 Communication Address ....................................................................... 8
4.1.2 Data Format ............................................................................................. 9
4.2 RS-485 ................................................................................................... 9
4.2.1 RS-485 Connection ............................................................................... 10
4.3 RS-422 ................................................................................................. 10
4.3.1 RS-422 Connection ............................................................................... 11
4.4 Modbus Protocol ................................................................................ 12
4.4.1 An Introduction to Modbus .................................................................. 12
4.4.2 Remote Terminal Unit Transmission Mode ......................................... 12
4.4.3 Cyclic Redundancy Check ................................................................... 14
4.5 Options Module Data Tables .............................................................. 15
4.5.1 Table 2 Accumulated Energy Readings .............................................. 16
4.5.1.1Energy Registers ........................................................................... 16
4.5.1.2Writing to Energy Registers ......................................................... 17
4.5.1.3Energy Scaling ............................................................................... 17
4.5.2 Table 11 Instantaneous Meter Values ................................................. 18
4.5.3 Table 12 Additional Instantaneous Values ......................................... 19
4.5.4 Table 13 Peak Values ............................................................................ 19
4.5.4.1Instantaneous/Peak Values ........................................................... 19
4.5.4.2Scaling Instantaneous/Peak Values ............................................. 20
4.5.5 Table 14 Meter Set-up ........................................................................... 20
4.5.5.1Meter Set-up Values ....................................................................... 21
4.5.6 Table 15 Peak Current and Voltage Demand ...................................... 21
4.5.7 Table 16 Current and Voltage Demand ............................................... 22
4.5.8 Function 04 (or 03) Read Multiple Registers .................................... 22
4.5.9 Function 06 Preset a Single Register ................................................ 23
4.5.10 Function 08 Loop Back Diagnostic .................................................... 25
4.5.11 Function 16 Preset Multiple Registers .............................................. 26
4.5.12 Exception Responses ........................................................................... 27
4.6 Modbus Diagnostics LEDs ................................................................ 29
5 Specifications .................................................................................. 30
4
4.6 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
device.
The LEDs are intelligent indicators, which are illuminated under specific condi-
tions, as follows:
VALID COMMAND Illuminated when a host command is received, surrounded
by RTU frame breaks (ref 0) with the correct Modbus ad-
dress.
ERROR/EXCEPTION Illuminated when a Valid Command is received as above,
but a CRC error (ref 4.4.2) or Exception Condition (ref
4.5.12) is detected.
BUS ACTIVITY Illuminated whenever changes occur on the receive- input
pins of the module.
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