EMA-D9 - USER MANUAL
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7.4.4) MODEM
CONNECTION
To make the remote connection it needs to program the remote modem (connected to the EMA
network). To program this modem the user has to use any communication program like
HyperTerminal. The Hayes commands to program a standard modem are the following:
AT&D0&S0&C0&R1
ATS0=2
ATX3
AT&W0Y0
The meaning of the commands is the following (AT is the command prefix):
•
&D0: ignore DTR.
•
&S0: ignore DSR.
•
&C0: ignore CD.
•
&R1: ignore RTS.
•
S0=2: set at two as the ring number after the which the modem automatically reply (the number can
be different by 2, but it must be different by 0).
•
&W0: store the configuration in the register 0 of the modem’s not volatile memory.
•
Y0: set the configuration stored in the register 0 of the modem’s not volatile memory as the default
configuration at the starting or the reset of modem.
See the modem’s user manual.
7.4.5) SECOND
RS485 BOARD (option)
The second RS485 is available on option board to insert in the EMA-D9.
On the second serial port there is a 5Vdc output.
The serial port and the 5Vdc output are at galvanic insulation from internal circuit of the EMA-D9.
Warning. The hardware modification of instrument will change the Setup in the default configuration.
It’s possible to manage the supervisioning of energy
consumption through remote structures as modem
application in order to cover big distances.
RS232 RS485
Transmit Data
Receive Data
Signal GrouND
Signal
