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| INSTALLATION
PDM
PDM Operator's Manual Version 2.4a • September 2019
Basic remote readout
1.
Use the connections shown on the right side of the schematic. At the DB-25, connect
pin 7 (output common) to pin 20 (PDM ground).
2.
Connect a 4.7 k
Ω
1/4 watt resistor between pin 8 (+5 V) and the anode or + lead of an
LED; connect the cathode or – lead of the LED to pin 19 (output 1).
3.
Add up to 7 more resistor-and-LED combinations as needed, using pin 8 as the
common voltage supply and connecting the LEDs cathodes to individual outputs in
the chart below.
Connecting to external logic or relay circuits:
PDM’s GPIO inputs and outputs are isolated from its power supply and ground, and can be
connected to external logic circuits or the power supplies in remote equipment:
n
Inputs require at least 6 mA flowing from the input common (pin 13) and the
individual input circuit pin.
n
Outputs can carry up to 25 mA, up to 30 V DC per channel, between the individual
output circuit pin and output common (pin 7).
GPIO Pinouts
PIN
SIGNAL
PIN
SIGNAL
1
NC
14
NC
2
Ground
15
NC
3
Output 8
16
Output 7
4
Output 6
17
Output 5
5
Output 4
18
Output 3
6
Output 2
19
Output 1
7
Output Common
20
Ground
8
+5 VDC
21
NC
9
Input 8
22
Input 7
10
Input 6
23
Input 5
11
Input 4
24
Input 3
12
Input 2
25
Input 1
13
Input Common
NC — No internal connection
Содержание PDM
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