15
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 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 CR LF (Code: hex 0x0d
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 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 communica-
tion 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, Labworld
soft
®
, provides a convenient tool for
controlling circulating equipment and collecting data under MS Windows, and includes graphical entry features, for pump
motor speed ramps for example�
Commands:
NAMUR Commands Function
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
IN_SP_3
Read the safety setting temperature
IN_SP_4
Read the pump setting speed
OUT_SP_1 xxx
Set the internal setting temperature XXX
OUT_SP_12@n
Set the WD safety temperature with echo of the set (defined) value�
OUT_SP_4 xxx
Set the pump speed XXX
OUT_SP_42@n
Set the WD-safety speed with echo of the set (defined) value�
OUT_WD1@n
Start the watchdog mode 1 and set the time for the watchdog to n (20���1500) seconds�
Echo of the Watchdog time�
During a WD1-event, the tempering and pump functions are switched off�
This command needs to be send within the watchdog time�
OUT_WD2@n
Start the watchdog mode 2 and set the watchdog time to n (20���1500) seconds�
Echo of the watchdog time�
During a WD2-event, the set temperature is changed to the WD safety temperature and the
pump set speed is set to the WD safety speed�
This command needs to be send within the watchdog time�
RESET
Reset the PC control and stop the device functions�
START_1
Start the tempering function�
START_4
Start the pump function�
STOP_1
Stop the tempering function�
STOP_4
Stop the pump function�
