Christchurch, NZ
MReX-PCB User Guide V1.02
PCB Pinout
Pin #
Description
1
GND
2
GND
3
Contact Input 3 (Connection to input must
be volt free)
. Pull to GND to operate.
4
Contact Input 2 (Connection to input must
be volt free). Pull to GND to operate.
5
Contact Input 1 (Connection to input must
be volt free). Pull to GND to operate.
6
Piezo. This pin is electrically tied to pin 7
7
Green LED – Cathode (open drain output)
8
Green LED + Anode (not connected if LED
is powered externally)
9
Piezo. This pin is electrically tied to pin 8
10
Contact Input 4 (Connection to input must
be volt free). Pull to GND to operate.
11
Contact Input 5 (Connection to input must
be volt free). Pull to GND to operate.
12
Programming VCC
13
GND
14
Serial TTL IN
15
Serial TTL OUT
16
Red LED – Cathode (open drain output)
17
Red LED + Anode (not connected if LED is
powered externally)
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