Xylem 795 MJK Data Transmitter User Manual

Page 5

M795GB0503

Data Transmitter 795

SW ver. 830434

Introduction

Thank you for choosing an MJK Data Transmitter
795. A great effort has been put into developing a
product, which complies with all demands.

MJK Data Transmitter 795 is mounted in the field
and with its digital in- and output and analogue
input it is capable to receive and transmit most
types of digital and analogue signals. From a
built-in RS232 serial port, the MJK Data Trans-
mitter 795 can communicate directly with other
equipment i.e. a pc, PLC or a Scada system.

MJK Data Transmitter 795 can with one click on
the mouse or from a telephone call activate digital
output and/or read in- and outputs, alarm signal
type for the latest 9 alarms and all logged data.

Display of a pumping station from a pc with the

monitoring program MJK-Link™.

MJK Data Transmitter 795 can also be program-
med to make a telephone call when there is an
alarm and transmit the alarm as text to a pc or
SCADA system and to a cell phone as SMS text.
The Data Transmitter 795 has a bult in battery for
telephone calls at power failure.

An MJK Data Transmitter 795 with built-in modem

can transmit alarms as SMS messages directly to

the cell phone of employee on duty.

All settings, alarms and logged data can be read
in the display, from easy to use functionnal
menus.

MJK Data Transmitter 795 can be supplied in
versions that communicates via a built-in GSM
modem or telephone modem, or in versions for
radio modem.

MJK Data Transmitter 795 is easy to install and
operate, but read the instruction manual carefully
in order to make optimum use of the unit.

You can allways contact your sales reprsentative
or the MJK Automation Hotline in case of doubt
or for guidance. Try also to log onto http://
www.mjk.com.

1.1

Versions

MJK Data Transmitter 795 is as standard
supplied in the following hardware versions:

8, 12 or 16 digital inputs

0,4 or 8 digital outputs

4 analogue inputs

1 or 2 RS232 ports

The RS 232 ports is used as connection to MJK
Pump Controller 704 and to connection of a PC
for configuration or reading of data in the field for
i.e. a portable PC or for configuration or reading
of data, when the Data Transmitter 795 is used
as data
logger.

1.2

Communications protocols

MJK Data Transmitter 795 can be connected to a
distribution station either through a serial
connection (RS232-RS 485), a built-in Hayes
compatible telephone modem, a data radio or a
GSM modem.

Communication complies with one protocol
which must be followed by master and slave.
Data Transmitter 795 is always the slave, i.e. the
Data Transmitter must receive a command before
it can reply. MJK Data Transmitter 795 is supplied
with Comli PLC-protocol as standard. The
following historical data are available in this
protocol:

Time counter on digital inputs, total, total
today, total yesterday and the latest 24 hours,
all with 1 hour interval.

Analogue values stored with 5 min. interval 24
hours back, and in the extended log with a
user defined logging interval.