Micro Technic PV-1800 User Manual
Page 9
Users Manual & Installation Guide
PV- 1800: Power supply module with GSM MODEM
Page 9 / 19
Analogue inputs (CN5)
The PV-1800 has 8 isolated analogue inputs accessible in a 10pin box header (CN5). Beside these
inputs, there is also a +3.3V isolated voltage with common ground reference as the analogue inputs.
This voltage can be used to power external conditioning circuitry.
Depending on the model – see section ordering codes – each input will have a full scale of 2.5V,
5.0V, 10V, or 20mA. The table shows the connector layout:
The input circuitry looks like this:
The analogue inputs on PV1800 are factory configured by choosing proper values for R1 and R2. In
the table the values are shown for the different models. The input resistance is 1M on all voltage
input channels. The software interface is explained in section PV-1800 register interface.
Differential measurement
The analogue inputs can two by two be used for differential measurement. Inputs, which can make
up a pair, are defined in the software. One of the wires, in each pair, is inside the ADC connected as
a ‘negative’ input; the other as a ‘positive’ input. The common mode voltage on the ‘negative’ input
must not exceed 0.5V in a 0 – 2.5V configuration and 1V in a 0 - 5V configuration. The
combinations of the actual inputs used for differential measurement are shown in section -
PV-1800
register interface. Also here it is described which input that is used as the ‘negative’.
Pin no Name
Pin no CDB-9F
1
Analogue GND
1
2
Analogue input#7
6
3
Analogue input#6
2
4
Analogue input#5
7
5
Analogue input#4
3
6
Analogue input#3
8
7
Analogue input#2
4
8
Analogue input#1
9
9
Analogue input#0
5
10
+3.3V Isolated
Configuration R1
R2
0 - 2.5V
0 ohm
1 Mohm
0 - 5 .0V
449 Kohm 449 Kohm
0 - 10.0V
741 Kohm 246 Kohm
0 - 20mA
0 ohm
125 ohm
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