Communications
515 BR03 - 15 August 2021
71
•
ASCII
- In this ASCII protocol each command and response is a string
of ASCII characters. This proprietary protocol is developed by Contrec
to allow for simple information interchange. The main advantages of this
mode are that it allows extended time intervals to occur between
characters without causing a timeout error and that messages can be sent
and monitored easily with a simple ASCII terminal.
•
Modbus RTU
- Modbus RTU is an industry-standard protocol which
allows the instrument to be easily connected to computers running
supervisory software systems. The main advantage of this mode is that
its greater character density allows better data throughput than ASCII
mode, however each message must be transmitted in a continuous
stream.
•
Printer
- In the Printer protocol there is a selection of printer types.
Simple ASCII Protocol
Note:
Not all ASCII commands are applicable for Batch Controller
applications.
This simple ASCII protocol requires that all requests are initiated with a
colon ( : ) and terminated with a carriage return (
C
R
). The message
termination can include a linefeed before the carriage-return (
L
F
C
R
), but it
is the carriage-return that acts as the message termination.
All responses by the instrument are terminated with a linefeed and a
carriage-return (
L
F
C
R
).
Requests Format
The format of a request to the instrument is as follows:
Each request must include the address and command portions. The
underlined section is an optional part of the request string.
Address
In multipoint communications, each instrument must have a unique address
and it is essential in the request for identifying a particular instrument.
However, it may be set to 000, for special broadcast commands. For single-
instrument communications, the address can also be set to 000 in the
request.
:A001:LR001:XXX?
L
F
C
R
Address
Log
Command
Log
timebase number
Carriage-return
Linefeed
Summary of Contents for 515 BR03
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