The serial data port uses 3 (including common Ground) of the 14 pins configured as Data Communication
Equipment (DCE). RS485 uses two pins.
Serial data ports on most computer equipment are configured as Data Terminal Equipment (DTE). In some
cases, it may be necessary to insert a “null modem” or “gender changer” in the serial data line in order to
correctly connect between the devices.
The GPIO connector is Micro-Fit 3.0™ 2 x 7 position 3.0 mm pitch connector manufactured by molex
(www.molex.com) .
Digital inputs have pull-down resistors. All general purpose I/O (GPIO) pins (i.e. all input and outputs) have
transient protection.
The I/O port provides for the control of 4 external devices and for monitoring 4 external inputs
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