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Connections for Modbus
The RS-485 terminals can be used for remote communication with a Distrib-
uted Control System (DCS), Data Acquisition System (DAS), or Programmable
Logic Controller (PLC) using Modicon Modbus® RTU protocol. The Modbus®
RTU protocol can be used with the analyzer operating as a slave device, re-
sponding to Modbus queries within one second, and providing full access to
all registers. See Figure 7.2 for the location of the RS-485 terminals inside the
Electronics Enclosure.
Connections for Permanent Ethernet Connection (Optional)
When using the Ethernet interface (using Modbus-TCP) on the analyzer, the
minimum requirements for the Ethernet cable is a shielded CAT 5e cable to
connect the analyzer to the network, up to a maximum of 100 m from the hub/
switch/router. The Ethernet interface supports a 10Base-T/100Base-TX con-
nection. For hazardous locations and/or lengths greater than 100 m, special
requirements may be necessary. Contact your network administrator for infor-
mation.
Connect the Ethernet cable between the RJ-45 Ethernet port on the Modbus
gateway inside the Electronics Enclosure (see Figure 7.2) and the network.
PN 903-8820, Rev A
®
RTU on the RS-485 (Optional)
After the analyzer installation is complete (including all I/O Signal,
Relay Contact, and AC Power connections), if the optional Modbus
RTU is being used, configure and enable the RS-485 port for Modbus®
communications as described in "Start-Up and Verification" (Powering
Up the Analyzer) later in this document.
The Ethernet cable normally has a very low voltage rating; therefore,
for user safety, ensure that it is physically prevented from crossing or
touching any wiring carrying AC Power.
After the analyzer installation is complete (including all I/O Signal,
Relay Contact, and AC Power connections), if the optional Ethernet
Interface is being used, configure and enable the Ethernet parameters.
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Troubleshooting
