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The device can be operated in "Remote" mode via an RS 232 or
USB interface using the laboratory software labworldsoft
The RS 232 interface at the back of the device is fitted with a
9-pole SUB-D port which can be connected to a PC. The pins are
assigned serial signals.
Please comply with the system re-
NOTICE
quirements together with the ope-
rating instructions and help sec-
tion included with the software.
USB interface
The Universal Serial Bus (USB) is a serial bus for connecting the
device to the PC. Equipped with USB devices can be connected to
a PC during operation (hot plugging). Connected devices and their
properties are automatically recognized.
Use the USB interface in conjunction with labworldsoft
tion in "Remote" mode and also to update the firmware.
Installation
First, download the latest driver for devices with USB in-terface
from http://www..com//lws/download/usb-driver.zip and install
the driver by running the setup file. Then connect the device
through the USB data cable to the PC.
Serial interface RS 232 (V 24)
Configuration:
•
The functions of the interface connections between the de-
vice and the automation system are chosen from the signals
speci-fied in EIA standard RS 232 in accordance with DIN 66
020 Part 1.
•
For the electrical characteristics of the interface and the allo-
cation of signal status, standard RS 232 applies in accordance
with DIN 66 259 Part 1.
•
Transmission procedure: asynchronous character transmissi-
on in start-stop mode.
•
Type of transmission: full duplex.
•
Character format: character representation in accordance
with data format in DIN 66 022 for start-stop mode. 1 start
bit; 7 character bits; 1 parity bit (even); 1 stop bit.
•
Transmission speed: 9600 bit/s
•
Data flow control: none
•
Access procedure: data transfer from the device to the com-
puter takes place only at the computer's request
Command syntax and format
The following applies to the command set:
•
Commands are generally sent from the computer (Master) to
the stirrer machine (Slave).
•
The stirrer machine sends only at the computer's request.
Even fault indications cannot be sent spontaneously from the
device to the computer (automation system).
•
Commands are transmitted in capital letters.
•
Commands and parameters including successive parameters
are separated by at least one space (Code: hex 0x20).
•
Each individual command (incl. parameters and data) and
each response are terminated with Blank CR LF (Code: hex
0x20 hex 0x0d hex 0x20 hex 0x0A) and have a maximum
length of 50 characters.
•
The decimal separator in a number is a dot (Code: hex 0x2E).
46
Interfaces and outputs
The above details correspond as far as possible to the recommen-
®
dations of the NAMUR working party (NAMUR recommendations
.
for the design of electrical plug connections for analogue and
digital signal transmission on individual items of laboratory control
equipment, rev. 1.1).
The NAMUR commands and the additional specific commands
serve only as low level commands for communication between
the stirrer machine and the PC. With a suitable terminal or com-
munications programme these commands can be transmitted di-
rectly to the stirrer equipment.
The
tool for controlling the equipment and collecting data under MS
Windows, and includes graphical entry features, for motor speed
ramps for example.
®
for opera-
The following table summarises the (NAMUR) commands under
-stood by the control equipment.
NAMUR Commands
IN_NAME
IN_PV_3
IN_PV_66
IN_SP_66
IN_SP_70
IN_MODE_66
IN_ERROR
OUT_SP_66
OUT_SP_70
OUT_MODE_66
START_66
STOP_66
RESET
software package, labworldsoft
Function
Read device name
Read PT 1000 value
Read current pressure value
Read pressure target value
Read hysteresis target value
Read current evacuation mode
Read error status
Set pressure target value
Set hysteresis value
Set evacuation mode
Start evacuation
Stop evacuation
Switch to normal operating mode
®
, provides a convenient
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