Dilution/Conditioning Devices; Analog/Digital Interface - TESTO CU-2 User Manual

8 Electrical Connections
Warning
In case of a blown fuse, replace it only with the specified type of fuse. If the fuse
is repeatedly blown, the unit must be sent to the manufacturer or to an
instructed service station for checking and repair.
Electric Shock
Make sure that the protecting ground pin of the country specific plug is correctly
connected to the protecting ground contact of your socket. If the plug is
replaced, ensure the yellow/green ground wire of the cable is properly
connected to the new ground pin or the case is otherwise connected to
protective earth which is usually indicated by the
8.2.

Dilution/Conditioning Devices

The testo ASET15-1 interface 2) and testo MD19-3E interface 3) may exclusively be used to
connect these devices to the testo CU-2 digital control unit. The pin assignment of these
interfaces is adapted to the specific analog and digital input and output signals of the testo MD19-
3E Rotating Disk Diluter and testo ASET15-1 Air Supply / Evaporation Tube.
8.3.

Analog/Digital Interface

The pin assignment of the external analog and digital in- and output signals interface 4) and
connector 20) is shown in Fig. 8.1.
Fig. 8.1: external in- and output signals connector 20)
The analog and digital inputs and outputs have the following properties and requirements:
•
Digital trigger input:
•
Digital outputs: high level: 24.0 +/- 0.2 VDC low level: < 0.5 VDC,
The analog DC voltage signals are as follows:
•
Analog inputs:
•
Analog outputs:
D-
sub signal description
pin
1 analog input 0
2 analog input 1
3 analog input 2
4 analog input 3
5 analog input 4
6 PNC error (if multiple DO ports error is
set)
7 dilution system error (or single port error)
8 digital input: trigger signal
10 analog output 0
11 analog output 1
36
high level: 5...25 VDC
pull up current: 0.5 mA / load resistance R
maximum load is 30 mA
signal range – 10...+10 VDC input impedance R
signal range 0...+10 VDC 12 bit signal
output impedance R
sign.
low level: max. 1 VDC
= 10...50 kΩ
in
= 0.5 Ω.
out
pola- analog input /
rity / digital output
+ A I
+ A I
+ A I
+ A I
+ A I
+ D O
+ D O
+ D I
+ A O
+ A O
= 20.0 MΩ
in
signal range
– 10...+10 VDC
– 10...+10 VDC
– 10...+10 VDC
– 10...+10 VDC
– 10...+10 VDC
+24 VDC
+24 VDC
5...25 VDC
0...+10 VDC
0...+10 VDC