23
Interface and output
The device can be connected to a PC and operated with the
laboratory software labworldsoft
®
through the RS 232 port
(9), USB port (10) or USB port on the Wireless Controller
(WiCo)�
Note: Please comply with the system requirements to-
gether with
the
operating instructions and help section
included with the software�
USB interface:
The Universal Serial Bus (USB) is a serial bus for connect-
ing the device to the PC� Equipped with USB devices can
be connected to a PC during operation (hot plugging)�
Connected devices and their pr
operties ar
e automatically
recognized� The USB interface can also be used to update
firmware�
USB device drivers:
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
stirrer machine and the automation system are chosen
from the signals specified in EIA standard RS 232 in ac-
cordance with DIN 66 020 Part 1�
-
For the electrical characteristics of the interface and the al-
location of signal status, standard RS 232 applies in accor-
dance with DIN 66 259 Part 1�
- Transmission procedure: asynchronous character trans-
mission 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 (Mas-
ter) to the device (Slave)�
- The device 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 parame-
ters are separated by at least one space (Code: hex 0x20)�
- Each individual command (incl� parameters and data)
and each response are terminated with CR LF (Code: hex
0x0d hex 0x0A) and have a maximum length of 80 char-
acters�
-
The decimal separator in a number is a dot (Code: hex
0x2E)�
The above details correspond as far as possible to the recommendations of the NAMUR working party (NAMUR recom-
mendations 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 device and the PC� With a suitable terminal or communications programme these commands can be transmit-
ted directly to the circulator equipment� The IKA software package, Labworldsoft
®
, provides a convenient tool for control-
ling circulating equipment and collecting data under MS Windows, and includes graphical entry features, for pump motor
speed ramps for example�
Commands:
Commands
Function
IN_PV_1
Read the external actual temperature
IN_PV_2
Read the internal actual temperature
IN_PV_3
Read the safety actual temperature
IN_PV_4
Read the pump actual speed
IN_SP_1
Read the internal setting temperature (if 0: internal control)
Read the external setting temperature (if 1: external control)
IN_SP_3
Read the safety setting temperature
IN_SP_4
Read the pump setting speed
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