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Chapter 4
Setting Up Communications
4.1
Overview
This chapter describes:
•
Connecting to the Model 3711 through the LOI
•
Connecting to the Model 3711 through COMM 2
•
Configuring communications parameters
-
Configuring COMM 2 on the Model 3711
-
Configuring ROCLINK 800 communications parameters
•
Configuring Report By Exception (RBX) alarming
•
Configuring passthrough mode
4.2
Communications overview
The Model 3711 has three communication ports:
•
The Local Operator Interface (LOI) port
•
COMM 1 – dedicated to communication with the Micro Motion sensor, and cannot be used for
other communication. Do not configure COMM 1.
•
COMM 2 – may be either a serial communications card or a dial-up modem card.
The LOI supports only ROC protocol. COMM 2 supports both Modbus and ROC protocol.
ROCLINK 800 uses ROC protocol. A host program can use either Modbus or ROC protocol.
COMM 2 auto-detects and responds to both protocols.
In a typical installation:
•
ROCLINK 800 is used to configure the Model 3711, and to perform administration and field
service tasks. ROCLINK 800 may also be used to collect history data. The ROCLINK 800
connection is typically made through the LOI, using the Direct Connect function.
•
A host program is used to collect history, event, and alarm data. The host program typically
connects via COMM 2.
ROCLINK 800 provides two connection types:
•
Direct Connect – ROCLINK 800 makes multiple connection attempts, using the values of
Device Address
with COM port 1 on the PC and works through all COM ports, at all baud rates, until a
connection attempt succeeds.
•
Connect – ROCLINK 800 makes a connection attempt to the specified device, using the
ROCLINK 800 communications parameters configured for that device (Section 4.5.2).
Configuration and Use Manual
, Device Group
, and baud rates between 1200 and 19.2K. It begins
240
240
25
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Troubleshooting
