Specifications

Table Of Contents
OPERATIONS
Page 65 MRC-565 Packet Data Radio Operations & Maintenance
The Sensor port interface is a 25-pin male D connector. The connector pin outs and their
respective functions are shown below.
The analog voltages are routed to a 12-bit analog-to-digital converter (ADC) which provides a
resolution of +/-.1% and an accuracy over temperature of ±1%.
SIGNAL PORT
Pin
Signal
1
Optocoupled input #1 positive
(500 ohm resistor)
2
SDI-12 Data
3
Optocoupled input #2 positive
(500 ohm resistor)
4
Optocoupled input #1,2,3,&4 return
5
Optocoupled input #3 positive
(500 ohm resistor)
6
Det RF Channel 3
7
Optocoupled input #4 positive
(500 ohm resistor)
8
Det RF Channel 2
9
Ground
10
SS Relay Out #1 - .5 Amp Rating
11
SS Relay Out #1 +
12
Signal Presence SP
13
SS Relay Out #2 - .5 Amp Rating
14
SS Relay Out #2 +
15
TX Key
16
+5V Reference (10 ma max) +/- 2%
17
Analog Input #1 ( 0 to 5 V)
18
Analog Input #2 ( 0 to 5 V)
19
Analog Input #3 ( 0 to 5 V)
20
Analog Input #4 ( 0 to 5 V)
21
Analog Input #5 ( 0 to 5 V)
22
Analog Input #6 ( 0 to 5 V)
23
+12V Switched (.5 A Max)
24
+12V (0.5A Max)
25
Detected RF Channel 1
A 25-pin terminal block is a convenient means for interfacing to the various sensors and control
points.
5.6 Data Loggers Interface