Serial Communications 3104
REC XXXXX 1-1
Chapter 1 Introduction
1.1 General
The Micro-Tech 3104 is a bus-based microprocessor instrument equipped with one
COMM A (on Mother Board) that can be equipped (optionally) with a second serial
communication boards. Each COMM A board has one serial channel that can be
configured according to the following standards.
! RS423/RS232C For point to point asynchronous bidirectional
communications, maximum 50 feet (15 m). Modem
capability.
! RS485/RS422 For point to point or multidrop 4 wire bidirectional
communications, maximum 4000 feet (1200 m).
! Current Loop For high immunity bidirectional asynchronous
communications. Passive only.
All of the above are optically isolated.
COMM A board (Optionally) can be installed in any available mother board expansion
slot. After installing the board and power has been restored, the instrument
automatically detects the new board and adds the communication set-up scrolls to
the Main Menu scrolls. The Micro-Tech refers to the COMM A on the Mother Board
as COM 1, and the COMM A board (if installed) as COM 2.
If two COMM A are availables; one can be set up for printing, the other one for
transferring data to and from other intelligent devices such as computers and PLC's.
The system cannot support two printers or two COMM lines.
Each COMM A contains a perpetual clock/calendar circuit with battery backup. The
battery is located on the mother board and is the same battery used for system
memory backup. The system automatically detects and uses the clock calendar
circuit of the first board and ignores the second.
Time and date set-up screens become visible after the COMM board is installed.
The Micro-Tech 3000 Integrator COMM meets the year 2000 requirements.
1.2 Communication Protocols
When a COMM line is set up for communication (not for a printer), the system is able
to send and receive data to and from another device connected to the COMM line.
The COMM option comes with the following software communication protocols
already built in:
- PC-Master A Thermo Ramsey proprietary protocol, multidrop.
- Modbus An AEG proprietary protocol, multidrop. The COMM option only
contains a subset of the protocol as specified in this manual.
- Allen-Bradley A proprietary protocol, multidrop. The COMM option only contains
a subset of the protocol in the PLC-5 version of it, as specified in
this manual.
- 3964R A Siemens proprietary protocol, single point.
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