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MTX-DIN Family
www.mtxm2m.com
2015/10 v2.3
Page
54
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103
MTX M2M® by MATRIX ELECTRONICA S.L.U
4.2.8
Optoisolated I/O
The MTX-DIN modem has 2 bidirectional (hardware configurable) optoisolated input/outputs (IO5
and IO6) as well as 4 optoisolated inputs (IN4, IN8, IN9 and IN10) available for use by the user.
The two optoisolated I/Os are located at pins 17 to 20 of the modem block connector, and the four
optoisolated inputs are located at pins 38 to 41.
To configure the direction of the IO5 and IO6 you must use the switches JPx1 and JPx2. Please see
the following figure for the exact board locations of these items
IN4, IN8, IN9 and IN10
The optoisolated inputs IN4, IN8, IN9 and IN10 are connected directly to the GSM module’s GPIO4,
GPIO8, GPIO9 and GPIO10 respectively. The electrical equivalent circuit of each input is shown in the
following figure: