IKA LR 1000 basic Betriebsanleitung Seite 47

"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 and shak-
ing functions will be shutdown according to the watchdog
mode selected or will be controlled using the preset set-
points. An operating system crash, a PC power failure or a
fault in the connecting cable to the instrument can cause an
interruption in data transmission.
PC 1.1 Cable:
Required for connecting the RS 232 port to a PC.
1
6
2
7
3
8
4
9
5
1
RxD 2
TxD 3
4
GND 5
6
RTS 7
CTS 8
9
USB cable A - Micro B 2.0:
This cable is required to connect USB port (9, see Fig. 2) to a PC.
USB micro B
"Watchdog"– Mode 1
If an interruption in data transmission occurs which is lon-
ger than the preset watchdog time, the heating and shak-
ing functions 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 lon-
ger than the preset watchdog time, the speed setpoint
value will be set to the WD safety speed setpoint and the
temperature setpoint will be set to the WD safety tempera-
ture setpoint. The PC 2 warning message will be displayed.
5
9
4
8
3
7
2
6
1
1
2 RxD
3 TxD
PC
4
5 GND
6
7 RTS
8 CTS
9
Fig. 19
USB A
Fig. 20
47