IKA HBC 10 baisc - Manual (Page 33)

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Interface and output
The device can be operated in “Remote” mode via the RS 232
interface (10) or the USB interface (11) connected to a PC
and with the laboratory software Labworldsoft ® .
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 properties are automatically
recognized. The USB interface can also be used to update
firmware.
USB device drivers
After the device is connected to the PC through the USB
cable, it tells the Windows operating system with which
device drivers are required.
Windows operating system will then either:
- load the driver
- install the driver if it is not already installed
- require manual installation, select:
http://www.ika.net/ika/lws/download/stmcdc.inf
The data communication is via a virtual COM port.
Configuration, command syntax and commands of the vir-
tual 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
allocation of signal status, standard RS 232 applies in ac-
cordance 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 (Master)
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 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 commu-
nication between the device and the PC. With a suitable
terminal or communications programme these commands
can be transmitted directly to the circulator equipment. The
IKA
® software package, Labworldsoft ® , provides a conve-
nient tool for controlling circulating equipment and collect-
ing data under MS Windows, and includes graphical entry
features, for pump motor speed ramps for example.
The following table summarizes the (NAMUR) commands
understood by the IKA
® control equipment.
Commands
NAMUR
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 ET=0)
Read the external setting temperature (if ET=1)
IN_SP_3 Read the safety setting temperature
IN_SP_4 Read the pump setting speed