19
•
The decimal separator in a number is a dot (code: hex 0x2E).
The above details correspond as far as possible to the recom-
mendations 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).
Commands
Function
IN_PV_2
Read the internal actual temperature
IN_PV_1
Read the external actual temperature
IN_SP_2
Read the internal setting temperature
IN_SP_1
Read the external target temperature
IN_SP_3
Read the safety setting temperature
IN_SP_4
Read the fan speed value
IN_SP_40
Read the flap open value
OUT_SP_2 X
Set the internal setting temperature, X = 0 to
250 in steps of 0.1 °C
OUT_SP_12@n Setting WD2 safety limit temperature with set
value echo
OUT_SP_4 X
Fan target value, X = 0 to 100 in steps of 10 %
OUT_SP_40 X
Flap target value, X = 0 to 100 in steps of 10 %
OUT_WD1@m Watchdog mode 1: if event WD1 should occur,
the heating functions are switched off and WD1
is displayed. Set watchdog time to m (20 - 1,500)
seconds, with watchdog time echo. This com-
mand launches the watchdog function and must
be transmitted within the set watchdog time.
The NAMUR commands and the additional specific
IKA
®
com-
mands serve only as low level commands for communication be-
tween the device and the PC.
With a suitable terminal or communications programme these com-
mands can be transmitted directly to the device. The
IKA
®
software
package, Labworld
soft
®
, provides a convenient tool for controlling
the device and collecting data under MS Windows, and includes
graphical entry features, for motor speed ramps for example.
OUT_WD2@m Watchdog mode 2: if event WD2 should occur,
the temperature target value is changed to the
WD safety temperature limit value. The warning
WD2 is displayed. The WD2 event can be reset
with OUT_WD2@0 - this also stops the watchdog
function. Set watchdog time to m (20 - 1,500)
seconds, with watchdog time echo. This com-
mand launches the watchdog function and must
be transmitted within the set watchdog time.
START_2
Start the heating function
STOP_2
Stop the heating function
RESET
Switches off the device function
NOTICE
When the USB cable is disconnected
while the device is running, the
device stays in PC mode. To reset
to function without PC, switch the
device off and on again.
USB B
USB A
1
4
3
2
1
2
3
4
“Watchdog” function, monitoring the serial data flow:
The following applies to situations where the watchdog function is
enabled (see Namur instructions). If no new transmissions of these
commands from the PC take place within the preset watchdog
time, the heating function will be shut down according to the
watchdog mode selected or will be controlled using the preset
setpoints. An operating system crash, a PC power failure or a fault
in the connecting cable to the device can cause an interruption in
data transmission.
“Watchdog”– Mode 1
If an interruption in data transmission occurs which is longer than
the preset watchdog time, the heating function will be shut down
and the error message PC 1 will be displayed.
“Watchdog”– Mode 2
If an interruption in data transmission occurs which is longer than
the preset watchdog time, the temperature setpoint will be set to
the WD safety temperature setpoint. The PC 2 warning message
will be displayed.
Connections between device and external devices:
USB 2.0 cable A - B:
This cable is required to connect USB interface to a PC
