DocID024383 Rev 1
7/56
UM1619
Hardware description
It is possible to connect the module in a three phase line (in case of communication modules
are connected in all three phases), in this case an external capacitor of 68nF X1 must be
connected to any additional phase, and then the other side of capacitors together with the
common pin 5 of the J1 connector, following the schematic shown in the
, and the 0-
Ohm resistor R1 must be mounted.
Figure 3. Three phase connection
The GP PLM module is provided with a user interface (J4) shown in
where,
connected the SPI interface pins (MOSI, MISO, SCK and NSS), are the RS232 interface
pins (Tx and Rx), the USB interface pins (D+ and D-) and the user programmable general
purpose I/O pins. Note that these pins are directly connected to the microcontroller, so
ensure that the insulation and protection is appropriate for the use of these pins.
It is possible to power the PLM using the +3.3 VDC (pin 19), +12 VDC (pin 20 or 22) and
GND (pins 17, 23,20 and 24) of this connector instead of the connector J2, using only a
single connector for power supply and control signals.
A lithium backup battery mounted on the module and a 32 KHz quartz allows use of the full
functionality of the internal RTC of the microcontroller, permitting precise time-based
operations.
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