Evco EVD120 Manual do Utilizador Página 11

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11EVD120
Programming
2 Programming
2.1 Preliminary remarks
EVD120 supports the MODBUS communication protocol.
The kind of network EVD120 can work in is RS-485 (look at Fig. 4); for further information on the realization of the
network, consult the Installation manual of RICS for Windows
®
(the document is available in the CD of RICS).
According to the standard settings:
the instrument address has value 247
the baud rate has value 9,600 baud
the parity has value even.
These parameters are hereinafter called “network parameters”.
2.2 Programming an EVD120 having standard network parameters using the soft-
ware RICS (adding an EVD120 having standard network parameters to an
existing and working network of instruments managed by RICS)
Operate as follows:
make sure the network is made of instruments that support the MODBUS communication protocol; to learn the
communication protocol supported by the instruments, consult the List of compatible instruments and supported
communication protocol (the document is available in the internet site www.evco.it)
make sure the network is made of less than 32 instruments
make sure no instrument in the network has value 247 as instrument address; to learn the instrument address,
consult the instructions (the document is available in the internet site www.evco.it)
make sure the baud rate of the instruments in the network has value 9,600 baud; to learn the baud rate of the
instrument, consult the instructions (the document is available in the internet site www.evco.it)
make sure the parity of the instruments in the network has value even; to learn the parity of the instrument, consult
the instructions (the document is available in the internet site www.evco.it)
quit RICS
disconnect the power supply of the instruments in the network
connect terminal “ + ” of the hardware driver of the last instrument in the network to terminal “ 1 ” of EVD120
(1)
connect terminal “ -- ” of the hardware driver of the last instrument in the network to terminal “ 2 ” of EVD120
(1)
connect terminal “ S ” of the hardware driver of the last instrument in the network to terminal “ 3 ” of EVD120
(2)
to reduce the reflections on the signal transmitted through the cable, plug in the termination of the first and last
element of the network
Fig. 4 - Example of RS-485 network.
[ EVD120 ]
Programming
(1) use a twisted pair
(2) pair, as far as possible, the ca-
ble to the ones you have already con-
nected
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