The data format in RTU mode is:

Coding System:

8-bit per byte

Data Format:

4 bytes (2 registers) per parameter.

 

Floating point format ( to IEEE 754)

 

Most significant register first (Default). The default may be changed if

 

required - See Holding Register "Register Order" parameter.

Error Check Field:

2 byte Cyclical Redundancy Check (CRC)

Framing:

1 start bit

 

8 data bits, least significant bit sent first

 

1 bit for even/odd parity or no parity

 

1 stop bit if parity is used; 1 or 2 bits if no parity

Data Transmission speed is selectable between 2400, 4800, 9600 and 19200 baud.

Input Registers

Input registers are used to indicate the present values of the measured and calculated electrical quantities.

Each parameter is held in two consecutive 16 bit registers. The following table details the 3X register address, and the values of the address bytes within the message. A tick (÷) in the column indicates that the parameter is valid for the particular wiring system. Any parameter with a cross (X) will return the value Zero (0000h). Some parameters are only available on the Integra 1540, as shown in the table below..

Each parameter is held in the 3X registers. Modbus Function Code 04 is used to access all parameters.

e.g. to request

Volts 1

Start address

= 00

 

No of registers

= 02

 

Volts 2

Start address

= 02

 

No of registers

= 02

Each request for data must be restricted to 40 parameters or less. Exceeding the 40 parameter limit will cause a Modbus exception code to be returned.

Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03

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Tyco 1540 manual Input Registers

1540 specifications

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