Modbus Holding Registers and Integra set up

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
		Number	Address Hex
			High	Low
			Byte	Byte
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	1-9999 A	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	0000-9999	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 Vin-Max Vin	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

1540 specifications

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