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Use Port 1 or Port 4 for RS-485 communication. The link using RS485 is viable for up to 4000 feet
(1219 meters).
Use Communicator EXT software to set the port's baud rate to the appropriate speed for your
hardware and/or network and enable Modbus ASCII protocol. See the Communicator EXT User
Manual for instructions.
You must use an RS485 to RS232 converter and a Null Modem. EIG recommends using its Modem
Manager. This converter has a built-in null modem and also provides line data buffering, making
the telephone line communication reliable; most commercial modems do not. For this
reason, EIG recommends the Modem Manager to alleviate any communication line errors that might
occur.
Using the Modem Manager also eliminates the need to program default settings into the modem.
This makes installation simpler.
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5-15
Electro Industries/Gauge Tech
Doc # E151701
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