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Modbus communication
card for CF 800
Installation Manual
Introduction
The range of CF 800 thermal energy meters can be equipped with a communication card in the Modbus RTU RS 485 format.
The Modbus card takes position 1 on the CF 800, while the COMIO card remains available.
Safety precautions
• Energy integrators operate at high temperatures and voltages and may cause serious
physical damage.
• Only authorised people can open the energy integrator and install/configure the
product.
• Work must always be with power off and with the main power supply on OFF.
• Always cut the mains power supply before opening and handling the product.
Technical characteristics
Supply voltage
Current
Output
Mode
Speed
Format
CE compatibility
Modbus control
Modbus format
Termination
Storage temperature
Operating temperature
Relative humidity
Conductor cross-section
INSTALLATION
3,6 V-12 V DC
< 35 mA, 120 mA in Modbus communication
RS 485 RTU protected against polarity reversals with 32 slaves at most by RS485 loop
(address: 1 -247)
2 wires, Differential Half-Duplex
2400, 4800, 9600, 19200 bits/s
8 data bits 1 stop bit without parity (MODBUS RTU)
EN 60950
EN 61000-6.2
EN 61000-6.3
Functions 08 and 03
IEE 32 bits MSB order of bytes 1, 2, 3, 4.
120 Ohm with switch
-10 °C ... +60 °C
+5 °C ... +55 °C
< 95 %
< 0,2-1 mm²
Potential danger
Caution: shock
hazard
DC current
AC current
Double insulation
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