20
Interfaces and outputs
The device can be operated in “Remote” mode via an RS 232 or
USB interface using the laboratory software labworld
soft
®
.
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.
The USB port at the rear of the stirrer is used for the connection
between the PC and the
WiCo
. The
WiCo
also has a USB port,
located on its right side. It can also be used to connect to a PC for
“remote control“.
Note:
Please comply with the system requirements together 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 connected 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 firmware.
Installation:
First, download the latest driver for
IKA
devices with USB interface
from:
http://www.ika.com/ika/lws/download/usb-driver.zip.
Install the driver by running the setup file. Then connect the
IKA
device through the USB data cable to the PC. The data communi-
cation is via a virtual COM port. Configuration, command syntax
and commands of the virtual COM ports are as described in RS
232 interface.
Serial interface RS 232:
Configuration
- The functions of the interface connections between the stirrer ma-
chine 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 alloca-
tion of signal status, standard RS 232 applies in accordance with
DIN 66 259 Part 1.
- Transmission procedure: asynchronous character transmission 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 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 parameters are
separated by at least one space (Code: hex 0x20).
- Each individual command (incl. parameters and data) and each re-
sponse 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 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
IKA
co-
mmands serve only as low level commands for communication
between the stirrer machine and the PC. With a suitable terminal
or communications programme these commands can be transmit-
ted directly to the stirrer equipment. The
IKA
software package,
labworld
soft
®
, provides a convenient tool for controlling stirring
equipment and collecting data under MS Windows, and includes
graphical entry features, for motor speed ramps for example.
The following table summarises the (NAMUR) commands under-
stood by the
IKA
control equipment.
Commands
Function
IN_NAME
Read device name
IN_PV_3
Read PT1000 value
IN_PV_4
Read current speed value
IN_PV_5
Read current torque value
IN_SP_4
Read rated speed value
IN_SP_5
Read the torque limit value
IN_SP_6
Read the speed limit value
IN_SP_8
Read the safety speed value
OUT_SP_4 xxx
Adjust the rated speed value xxx
OUT_SP_5 xxx
Adjust the torque limit value xxx
OUT_SP_6 xxx
Adjust the speed limit value xxx
OUT_SP_8 xxx
Adjust the safety speed value xxx
START_4
Start the motor
STOP_4
Stop the motor
RESET
Switch to normal operating mode
OUT_MODE_n (n= 1 or 2)
Change the speed range
IN_MODE
Read the speed range
PC 1.1 Cable (Station to PC):
Required for connecting the 9-pin socket to a PC.
1
2 RxD
3 TxD
4
5 GND
6
7 RTS
8 CTS
9
1
RxD 2
TxD 3
4
GND 5
6
RTS 7
CTS 8
9
PC
1
2
3
4
5
6
7
8
9
9
8
7
6
5
4
3
2
1
