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ROC827 Instruction Manual
Issued Mar-06 Communications 5-1
Chapter 5 – Communications
This section describes the built-in communications and the optional
communication modules used with the ROC827.
In This Chapter
5.1 Communications Ports and Modules Overview.......................................5-1
5.2 Installing Communication Modules..........................................................5-3
5.3 Removing a Communications Module.....................................................5-4
5.4 Wiring Communications Modules............................................................5-5
5.5 Local Operator Interface (LOI).................................................................5-5
5.5.1 Using the LOI .................................................................................5-7
5.6 Ethernet Communications .......................................................................5-7
5.7 EIA-232 (RS-232) Serial Communications..............................................5-9
5.8 EIA-422/485 (RS-422/485) Serial Communications Module.................5-10
5.8.1 EIA-422/485 (RS-422/485) Jumpers & Termination Resistors....5-11
5.9 Dial-up Modem Communications Module..............................................5-12
5.10 Multi-Variable Sensor (MVS) Interface Modules ...................................5-14
5.11 HART Interface Module .........................................................................5-16
5.12 Related Specification Sheets.................................................................5-20
5.1 Communications Ports and Modules Overview
The built-in communications and the optional communication modules
provide communications between the ROC827 and a host system or
external devices.
The ROC827 allows up to six communication ports. Three communication
ports are built-in on the CPU. You can add up to three additional ports
with communication modules. Table 5-1 displays the types of
communications available for the ROC827.
Table 5-1. Built-in Communications and Optional Communication Modules
Communications Built-in on CPU Optional Module
EIA-232 (RS-232D) Local Operator Interface (LOI) Local Port
Ethernet (use with DS800 Configuration Software) Comm1
EIA-232 (RS-232C) Serial Communications Comm2 Comm3 to Comm5
EIA-422/485 (RS-422/485) Serial Communications Comm3 to Comm5
Modem Communications Comm3 to Comm5
MVS Sensor Interface Comm3 to Comm5
The communication modules consist of a communications module (card),
a communications port, wiring terminal block, LEDs, and connectors to
the backplane. The ROC827 unit can hold up to three communication
modules in the first three module slots. Refer to Figure 5-1.