Modbus Holding Registers and Integra set up
Holding registers are used to store and display instrument configuration settings. All holding registers not listed in the table below should be considered as reserved for manufacturer use and no attempt should be made to modify their values.
The demand parameters may be viewed or changed using the Modbus protocol. Each parameter is held in the 4X registers. Modbus Function Code 03 is used to read the parameter and Function Code 16 is used to write.
Register | Parameter | Parameter | Modbus Start | Valid range | Mode | |
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| Number | Address Hex |
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| High | Low |
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| Byte | Byte |
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40001 | 1 | Demand Time | 00 | 00 | 0 only | r/w |
40003 | 2 | Demand Period | 00 | 02 | 8,15,20,30 minutes. | r/w |
40007 | 4 | System Voltage | 00 | 06 | 1V - 400kV | r/wp |
40009 | 5 | System Current | 00 | 08 | r/wp | |
40011 | 6 | System Type | 00 | 0A |
| ro |
40013 | 7 | Relay Pulse Width | 00 | 0C | 3,5,10 (x20mS) | r/w |
40015 | 8 | Energy Reset | 00 | 0E | 0 only | wo |
40023 | 12 | Pulse Divisor | 00 | 16 | 1,10,100,1000 | r/w |
40025 | 13 | Password | 00 | 18 | r/w | |
40037 | 19 | System Power | 00 | 24 |
| r/o |
40041 | 21 | Register Order | 00 | 28 | 2141.0 only | wo |
40299 | 150 | Secondary Volts | 01 | 2A | Min | r/wp |
r/w = read/write r/wp = read and write with password clearance ro = read only wo = write only
Password Settings marked r/wp require the instrument password to have been entered into the Password register before changes will be accepted. Once the instrument configuration has been modified, the password should be written to the password register again to protect the configuration from unauthorised or accidental change. Power cycling also restores protection. Reading the Password register returns 1 if the instrument is unprotected and 0 if it is protected from changes.
Demand Time is used to reset the demand period. A value of zero must be written to this register to accomplish this. Writing any other value will cause an error to be returned. Reading this register after instrument restart or resetting demand period gives the number of minutes of demand data up to a maximum of the demand period setting. For example, with 15 minute demand period, from reset the value will increment from zero every minute until it reaches 15. It will remain at this value until a subsequent reset occurs.
Demand Period The value written must be one of the following 8,15, 20 or 30 (minutes), otherwise an error will be returned.
System Type The System type address will display '1' for single phase 2 wire, '2' for 3 Phase 3 Wire, '3' for 3 Phase 4 Wire or 4 for single phase 3 wire.
Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03 | 59 |