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9.7 THERMAL BEHAVIOUR
Surrounding air temperature 50°C. For ambient temperature of over 50°C, the output current must be
reduced by 2.5% per °C. Max 70°C At the temperature of 70°C the output current will be 50% of In. The
equipment does not switch off in case of ambient temperature above 70°C or thermal overload. The
devices are protected for Over temperature conditions “worst case”; in this situation the device Shut-down
the output and automatic restart when temperature inside fall.
10 MODBUS
Some devices are provided of Modbus “RTU” communication protocol port; which requires the only one
device be the Master, all the others must be slave.
Hardware interface: RS485.
10.1 ELECTRICAL CHARACTERISTICS
The unit is a
SLAVE
in a MODBUS network. The slave units are compliant to the following specifications:
Transmission mode:
MODBUS RTU
Electrical Interface:
RS485 half-duplex serial line
Baud rate:
4800 / 9600 / 19200 / 38400 (default) bps
Data format:
8 data bits
Parity:
even (default) / odd / none
Stop bits:
1 (parity odd or even) / 1 or 2 selectable (parity none)
Slave address:
configurable in the range 1 (default) to 247
Connector type:
RJ45
Cable:
Shielded twisted pair, 8-wire RJ-45 plug
Size 3
Size4
Connector name
AUX2
AUX3
Pinout (fig. below)
A = pin 2, B = pin 1,
Common = pin 3
A = pin 5, B = pin 4,
Common = pin 3
10.2 HOW TO CONNECT MODBUS
10.2.1 Daisy Chain general connection Diagram
To connect the device in ModBus field, please use AUX2 and AUX3 Port.
•
Port: AUX 2 No. 13 is Present only in Sizes 3 and Sizes 4, MODBUS connection via RJ45 connector.
•
Port: AUX 3 No. 14 Present only in Sizes 4. The function is the same of Auxiliary Output “AUX 2”
