LTH Electronics MXD70 Series User Manual

Modbus RS485
Modbus RS485 Interface
Operating Guide
- 7 -
Modbus RS485
Response Times - The time it takes the instrument to respond to a request telegram from the
MODBUS master is typically 25 to 50 milliseconds. It may take longer for a command to be executed in
the instrument. Thus the data is not updated until the command has been executed. Write commands
especially are affected by this.
Data types - the following data types are supported by the instrument:
 FLOAT – Floating point numbers IEE 754, Data length 4 bytes (2 registers)
Byte 3 Byte 2 Byte 1 Byte 0
SEEEEEEE EMMMMMMM MMMMMMMM MMMMMMMM
S = Sign, E = Exponent, M = Mantissa
 INT – Integer (16 bits), Data length 2 bytes (1 register)
Byte 1 Byte 0
Most Significant Bit (MSB) Least Significant Bit (LSB)
 LONG – Long Integer (32 bits), Data length 4 bytes (2 registers)
Byte 3 Byte 2 Byte 1 Byte 0
Most Significant Bit (MSB) … … Least Significant Bit (LSB)
Byte Transmission Sequence – The bytes are transmitted in the following data order:
Type
Sequence
1
st
2
nd
3
rd
4
th
FLOAT
Byte 3
(SEEEEEEE)
Byte 2
(EMMMMMMM)
Byte 1
(MMMMMMMM)
Byte 0
(MMMMMMMM)
INT
Byte 1
(MSB)
Byte 0
(LSB)
LONG
Byte 3
(MSB)
Byte 2 Byte 1 Byte 0
(LSB)

LTH Electronics MXD70 Series Specifications

General

Brand	LTH Electronics
Model	MXD70 Series
Category	Measuring Instruments
Language	English