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Technical data Modbus
Bus system
Transmission rate
Transmission mode
Bus length (max.)
Response time:
(to system response)
The Interface works only if the Phase 1 is connected.
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The communication is ready 30s after the Power On
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The use of Energy meter in Bus with intensive communication could reduce the performance of the Bus
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Refresh Time for the Data is 10 s. For this reason one energy meter should be not polled faster as 10s.
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247 devices could be connected to the Modbus. Over 128 Devices, a repeater should be used.
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The Interface don't have a terminal resistor, this should be provided external.
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For a description of the used Registers please look at the Register Page
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Data transmission
Only «Read Holding Registers [03]/ Write Multiple Registers [16]» instructions are recognized.
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Up to 20 Registers can be read at a time.
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The device supports broadcast messages.
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In accordance with the Modbus protocol, a register R is numbered as R - 1 when transmitted.
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The device has a voltage monitoring system. In case of voltage loss, registers are stored in EEPROM
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(transmission rate, etc.)
Exception Responses
ILLEGAL FUNCTION [01]: The function code is not implemented.
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ILLEGAL DATA ADDRESS [02]: The address of some requested registers is out of range
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or more than 20 registers have been requested.
ILLEGAL DATA VALUE [03]: The value in the data field is invalid for the referenced register.
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Change the Modbus address direct on device
To modify the Modbus address, press 3 sec on ► touch
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In menu, ▼ increase address by 10, ► increase by 1
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Once the address is selected wait for the root menu to come back
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Modbus, RTU according to IDA specification
1'200-2'400-4'800-9'600-19'200-38'400-57'600-115'200.
The transmission Baud rate is automatically detected
8 Databits, Even Parity, 1 Stopbit
1200 m (without repeater)
Write: 60 ms
Read: 60 ms
Saia-Burgess Controls AG
Bahnhofstrasse 18 I CH-3280 Murten I Schweiz
T +41 26 / 672 72 72 I F +41 26 / 672 74 99
pcd@saia-burgess.com I www.saia-cc.com
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