17
Abbreviations used:
X,y = numbering parameter (integer number)
m = variable value, integer
n = value of variable, floating point number
X = 1 Pt100 thermometer (external temperature sensor)
X = 2 temperature (heating block)
X = 3 safety temperature
X = 4 stirring speed
X = 6 safety stirring speed
The device can be operated in “Remote” mode via the RS 232
interface or the USB interface connected to a PC and with the
laboratory software Labworldsoft
®
.
Note: Please comply with the system requirements togeth-
er with the operating instructions and help section 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 con-
nected to a PC during operation (hot plugging). Connected
devices and their properties are automatically recognized.
Use the USB interface in conjunction with
Labworldsoft
®
for
operation in “Remote” mode and also to update the firm-
ware.
USB device drivers
First, download the latest driver for IKA
®
devices with
USB interface from http://www.ika.com/ika/lws/down-
load/usb-driver.zip and install the driver by running the
setup file. Then connect the IKA
®
device through the USB
data cable to the PC.
The data communication is via a virtual COM port. Con-
figuration, command syntax and commands of the virtual
COM ports are as described in RS 232 interface.
RS 232 interface
Configuration
- The functions of the interface connections between the
machine and the automation system are chosen from the
signals specified in EIA standard RS 232 in accordance
with DIN 66 020 Part 1.
- For the electrical characteristics of the interface and the
allocation of signal status, standard RS 232 applies in ac-
cordance with DIN 66 259 Part 1.
- Transmission procedure: asynchronous character transmis-
sion in start-stop mode.
- Type of transmission: full duplex.
- Character format: character representation in accordance
Interfaces and output
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 stirrer machine to
the computer 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 stirrer machine to the computer (automation system).
- Commands are transmitted in capital letters.
- Commands and parameters including successive param-
eters 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 80 characters.
- The decimal separator in a number is a dot (Code: hex 0x2E).
The above details correspond as far as possible to the rec-
ommendations of the NAMUR working party (NAMUR rec-
ommendations 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 IKA
®
co-
mmands serve only as low level commands for communication
between the machine and the PC. With a suitable terminal or
communications programme these commands can be trans-
mitted directly to the equipment. The IKA
®
software pack-
age, labworldsoft
®
, provides a convenient tool for controlling
device and collecting data under MS Windows, and includes
graphical entry features, for motor speed ramps for example.
The following table summarises the (NAMUR) commands
understood by the IKA
®
control equipment.
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