Data Transmission; Exception Responses - Finder 7E.23.8.230 Montage- Und Bedienungsanleitung

Technical data Modbus
Bus system
Transmission rate
Transmission mode
Bus length (max.)
Response time:
■ The communication is ready 30 s after the power on
■ The use of energy meter in bus with intensive communication could reduce the performance of the bus
■ Refresh time for the data is 5 s. For this reason one energy meter should be not polled faster as 5 s
■ 247 devices could be connected to the Modbus. With more than 128 devices, a repeater should be used
■ The interface don't have a terminal resistor, this must be provided external
■ For a description of the used registers please look at the register page

Data transmission

■ Only «Read Holding Registers [03]/ Write Multiple Registers [16]» instructions are recognized.
■ Up to 20 Registers can be read at a time.
■ The device supports broadcast messages.
■ In accordance with the Modbus protocol, a register R is numbered as R - 1 when transmitted.
■ The device has a voltage monitoring system. In case of voltage loss, registers are stored in EEPROM (transmission
rate, etc.)

Exception Responses

■ ILLEGAL FUNCTION [01]: The function code is not supported.
■ ILLEGAL DATA ADDRESS [02]: The address of some requested registers is out of range
or more than 20 registers have been requested.
■ ILLEGAL DATA VALUE [03]: The value in the data field is invalid for the referenced register.
Changing the Modbus address direct on device
■ In the menu, go for «U»
■ Push long ( ≥ 3 sec) ➞ «Adr»
■ Push short ➞ address +1, push long ➞ address +10
■ Once the desired address is selected wait, to validate, till the root menu to come back
Modbus, RTU according to IDA specification
The transmission Baud rate is automatically detected
Even parity: 8 data bits, 1 stop bit
Odd parity: 8 data bits, 1 stop bit
No parity: 8 data bits, 2 stop bits
The transmission mode is automatically detected
1200 m (without repeater)
Write: up to 60 ms
Read: up to 60 ms
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