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7.
COMMUNICATION AND HMI
7.1.
Front Communication: USB
One communications port is installed on the front of the device. The connector that is used is a
mini USB (connector mini USB type A). The protocol that is used is Modbus RTU (19200 -8bit
– no
parity
– 1 stop bit). The protocol map and documentation that are used are attached in an
appendix to this manual.
The USB cable allows the power supply and the communication simultaneously.
The PC earth should be connected to the same earth as the relay to avoid communication
problems.
For writing commands it is necessary to set up a communication session (identification command)
which it will be closed after a period of time without communication. To set up a communication
session it will be necessary a password. For writing commands the password will be adjustable.
7.2.
Rear Communication: RS485
An option exists to fit the SIA-F with a rear communications port RS485, to communicate with
SCADA or RTU system.
The RS485 port output has two terminals -, +), located on the rear of the device. The protocol that
is used is ModBus RTU or DNP3.0 serial (8bit
– no parity – 1 stop bit).
The protocol map and documentation that are used are attached in
8.ModBus RTU protocol
or
9.DNP3.0 protocol.
This port can be used to continuously monitor the device from a remote PC or SCADA system. Up
to 32 devices can be connected to one bus; each piece with a different ModBus or DNP3.0
address. The device ModBus or DNP3.0 address and baudrate can be configured using the
communications or from HMI.
For writing commands it is necessary to open a communication session (identification command)
which it will be closed after a period of time without communication. To open a communication
session it will be necessary a password
To minimize communication errors as a result of noise, the use of a stranded and shielded cable is
recommended for the physical connection. All of the + terminals on one side, and all of the -
terminals on the other must be connected together in order to make the connection.
If a 2 strand cable is used for communication, the GND terminals must be connected to the
shielding. The shielding must be connected to the GND at only one point to avoid circular currents.
Resistors should be used at each end if very long cables are used. The best solution for avoiding
reflection is to install resistors at both ends of the cable. The ohm value of these resistors must be
equal to the cable impedance value. Fiber optics can be used in very aggressive environments,
and they are connected by using the corresponding converters.
Summary of Contents for SIA-F
Page 7: ...www fanox com Rev 17 7 119 2 DIMENSIONS AND CONNECTION DIAGRAMS 2 1 Frontal view...
Page 8: ...www fanox com Rev 17 8 119 2 2 Case dimensions The dimensions are in mm CUT OUT PATTERN...
Page 9: ...www fanox com Rev 17 9 119 2 3 Connection diagram 3 Phase CT and neutral CT Connection...
Page 10: ...www fanox com Rev 17 10 119 3 Phase CT and residual neutral Connection...
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Page 118: ...www fanox com Rev 17 118 119 NOTES...
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