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Doc # E107706 V1.25 5-8
5.4:
RS-4485
Connection—Nexus
Meter
to
a
Computer
or
PLC
Use any Port on the Nexus 1250/1252. If you use Port 1, set the selector switch beneath the port to
RS-485 (see Figure 5.3).
The link using RS-485 is viable for up to 4000 feet (1219 meters).
You must use an RS-485 to RS-232 converter, such as EIG’s Unicom 2500. See sections 5.7.1.
For information on connecting the Nexus Meter to a modem, see sections 5.14–5.16.
Do not use the V(+)/V(-) pins; they supply power to the Nexus Displays and Nexus I/O Modules.
5.5:
RJ-111
(Telephone
Line)
Connection—Nexus
with
Internal
Modem
Option
to
a
PC
Use RJ-11 Standard Telephone Line to connect with the Nexus 1250/1252. The RJ-11 line is
inserted into the RJ-11 Port on the face of the Nexus with Internal Modem Option.
The length of the connection using RJ-11 into the Nexus 1250/1252 is virtually unlimited.
To connect with other Nexus 1250/1252 Meters in either local or remote locations, you MUST use
Port 2 as a Master and an RS-485 connection.
The link using RS-485 is viable for up to 4000 feet (1219 meters).
For more information on the Nexus Meter with the Internal Modem Option, see Chapter 10 of this
manual.
5.6:
RJ-445
Connection—Nexus
with
Internal
Network
Option
to
multiple
PC’s
The Internal Network Option conforms to the IEEE 802.3, 10BaseT specification using unshielded
twisted pair (UTP) wiring. This allows the use of inexpensive RJ-45 connectors and CAT 3 or better
cabling.
Using this LAN connection allows multiple PC’s to be connected concurrently. The RJ-45 line is
inserted into the RJ-45 Port on the face of the Nexus with Internal Network Option.
The connection using RJ-45 into the Nexus 1250/1252 can connect the Nexus to a network using
Modbus/TCP protocol over Ethernet.
To connect with other Nexus Meters in either local or remote locations, you MUST use Port 2
(which is labeled Ethernet Gateway) as a Master and an RS-485 connection. The link using RS-485
is viable for up to 4000 feet (1219 meters).
For more information on the Nexus 1250/1252 Meter with the Internal Network Option, see Chapter
11 of this manual.