IKA LR 1000 basic Package - Handbuch (Seite 36)

36
“Watchdog” function, monitoring the serial data flow
The following applies to situations where the watchdog function is enabled (see Namur instructions). If no new transmis-
sions of these commands from the PC take place within the preset watchdog time, the heating and shaking functions will
be shutdown 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 instrument 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 and shaking
functions will be shutdown 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 speed setpoint value
will be set to the WD safety speed setpoint and the temperature setpoint will be set to the WD safety temperature set-
point. The PC 2 warning message will be displayed.
PC 1.1 Cable
Required for connecting the RS 232 port to a PC.
1
2 RxD
3 TxD
4
5 GND
6
7 RTS
8 CTS
9
1
RxD 2
TxD 3
4
GND 5
6
RTS 7
CTS 8
9
PC
1
2
3
4
5
6
7
8
9
9
8
7
6
5
4
3
2
1
Fig. 18