II. Hardware overview.
1. Connectors description
•
J5 – see table below
Pin no.
Pin description
Function details
1
AC power IN
AC power IN – only for Executive bridge and MDB master mode
2
AC power IN
AC power IN – only for Executive bridge and MDB master mode
3
24VDC power IN/OUT
MDB slave power input
4
GND
GND
5
GND
Signal GND for MDB master mode
6
Master RX
MDB master mode RX
7
GND
GND
8
Master TX
MDB master mode TX
9
GND
GND
10
Executive RX
Executive to MDB bridge mode – Executive RX
11
GND
GND
12
Executive TX
Executive to MDB bridge mode – Executive TX
13
GND
GND
14
MDB slave TX
MDB slave mode TX
15
GND
GND
16
MDB slave RX
MDB slave mode RX
17
Signal GND
MDB slave mode signal GND
18
Master wake
Not implemented in this firmware version (battery mode MDB payment
systems wake signal)
•
J1 – working mode change jumper
•
J8 – when installed, enables MDB sniffer
•
J4 – RS232 DB9 female connector. You need a straight cable or you can connect
an USB to RS232 cable. Please make sure your USB to RS232 cable/converter can
correctly handle hardware flow (RTS/CTS). Best results were obtained using FTDI
