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5.3.3: RS485 Connection—Meter to a Computer or PLC
Use Port 1 or Port 4. For information on connecting the Meter to a modem, see Section 5.3.13 of
this manual.
The link using RS485 is viable for up to 4000 feet (1219 meters). You may need to use an RS485 to
RS232 converter.
5.3.4: RJ-1 1 1 (Telephone Line) Connection—Meter with INP2 (Internal Modem
with Dial In/Dial Out Option) to a PC
Use RJ-11 Standard Telephone Line to connect with the Meter. The RJ-11 line is connected to Cable
5 from the back of the Meter with Internal Modem Option. The RJ-11 connector is supplied.
The length of the connection using RJ-11 into the Meter is virtually unlimited. To connect with
other meters in either local or remote locations, you MUST use Cable 5.
For more information on the meter with the INP2 Option, see Section 5.4.
5.3.5: RJ-4 4 5 Connection—Meter with INP200 (10/100BaseT) Option
The INP200 Option conforms to the IEEE 802.3, 10/100BaseT specification using unshielded
twisted pair (UTP) wiring. This allows the use of inexpensive RJ-45 connectors and CAT 3 or better
cabling. The RJ-45 connector is supplied with the meter (Cable 6).
Using this LAN connection allows multiple PC's to access the meter concurrently. The RJ-45 line is
inserted into the RJ-45 connector on Cable 6 coming from the back of the meter with the Ethernet
Option. The connection using RJ-45 into the meter connects the meter to a network using
Modbus/TCP protocol over Ethernet.
For more information on a meter with the INP200 Onboard Ethernet (10/100BaseT), see Section 5.5.
5.3.6: Modem/Ethernet Connection—Meter with INP202 (Combo Card) Option
The INP202 is an extension of INP200. It has all the features of INP200 plus a built-in Modem.
Modem and Ethernet capabilities can be used simultaneously.
The communication protocol supported by the modem is Modbus ASCII. The Communication
protocol supported by the Ethernet/Modem is Modbus RTU. INP102 converts all incoming modem
Modbus ASCII requests to Modbus RTU for internal and gateway communication. It then converts
all response Modbus RTU messages into Modbus ASCII protocol before it sends the responses to the
modem.
Some of the fixed parameters for the Ethernet/Modem are: 8 Data Bits, Even Parity, 1 Stop Bit.
The Ethernet/Modem's Gateway's Baud Rate and Delay Time are configurable.
For more information on a meter with the INP202 Modem/Ethernet Combo Card, see Section 5.6.
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Electro Industries/Gauge Tech
Doc # E151701
5-8
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