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14.1.4
"Watchdog" function, monitoring the serial
data flow
The following applies to situations where the watchdog functi-
on is enabled (see Namur instructions). If no new transmissi-
ons of these commands from the PC take place within the pre-
set watchdog time, the heating and stirring 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 RET control-visc /C can cause an interruption in data trans-
mission.
Watchdog – Mode 1
If an interruption in data transmission occurs which is longer
than the preset watchdog time, the heating and stirring functi-
ons will be shutdown and the error message ER 2 will be dis-
played.
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 setpoint.
The WD warning message will be displayed.
14.2
Connections between RET control-visc /C
and external devices
The RET control-visc /C unit can be connected to other exter-
nal devices using the following IKA adapters and adapter
cables.
40
14.2.1
PC 5.1 Adapter IKA - Control
An adaptor cable is available as an accessory part. It splits the
analog and serial signals. The analog output signals are allotted
to a 7-polar coupling according to the NAMUR-recommendati-
on; the serial sig-
nals to a 9-polar
S u b - D - b u s h i n g
plug (RS 232 C).
2
5
4
1
3
6
7
2 temperature
3 analog GND
5 speed /
viskosity trend
14.2.2
PC 2.1 Cable
Cable PC 2.1 for connection to the 9-pin socket on the compu-
ter.
1
RxD 2
TxD 3
magnetic stirrer
Magnetrührer
4
GND 5
= plug
= Stecker
6
RTS 7
CTS 8
9
14.2.3
PC 1.5 Cable
Cable PC 1.5 for connection to the 15-pin socket on the com-
puter (25-pin plug).
5
4 3 2
1
9
8 7 6
2 R x D
3 T x D
5 RS 232 GND
7 RTS
8 CTS
1
2 RxD
3 TxD
PC (processor)
4
PC (Rechner
5 GND
= bushing
= Buchse
6
7 RTS
8 CTS
9
RETCV_0107
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