MAX300-RTG: Installation Manual Hardware Installation
44
Ethernet Connections to Server PC
Physical connections are made to the external communications circuit board. The
connectors are RJ - 45 jacks located along the top edge of the board and labeled
J3 and J4. If a screw terminal connection is required for this line you will need an
adapter.
Status Connections
Relays rated for 24V/2A are assigned to track the status of certain internal
parameters (See Figure 16).
Flow Status: Sample flow loss contacts are available at TS11 terminals 1
(COM), 2 (N.C.), and 3 (N.O).
Instrument Status: A relay is available at TS10 terminals 1 (COM), 2
(N.C.), and 3 (N.O).
Component Out Of Range: A relay is available at TS10 terminals 6 (COM),
7 (N.C.), and 8 (N.O).
RS232 - RS422 – RS485 Serial Connections
A DB-9 connector is provided at J9. If screw terminals for this connection are
preferred, the serial lines are duplicated at TS1. This connection is most often
configured as a “Modbus” communications link. The default type of serial port is
RS232, however, RS422 and RS485 are options.
External Communications Options
OPC
OPC stands for Object Linking and Embedding [OLE] for Process Control. Support
for OLE is built into the Windows
®
operating systems. OPC treats data as
collections of objects to be shared by applications supporting the OLE
specification. OPC provides extensions to OLE to support process control data
sharing. The MAX300-RTG’s implementation of OPC communication option, an
OPC server, is accessed on the local network via the instrument’s Ethernet port.
Questor Modbus
The Modbus protocol, developed by Modicon Corporation, is a communication
protocol for the software. The MAX300-RTG is capable of acting as Master and/or
Slave type of device on any available serial port on the embedded server. If the
Modbus TCP/IP option is purchased, the Questor
™
5 Modbus communication will
be carried out through the same Ethernet connections as used for the Questor5
LAN connection to the server PC.
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