This manual refers to the Adapter shown in this post:
This adapter provides the capability to connect circuits with 3.3V/ 5V logic to a common PC’s COM port
It provides the capability to take the power directly from the PC’s COM port or directly from the circuit that uses this interface.
It has some leds (two for the RX line and 2 for the TX one) so to don’t disturb the data lines. A red led gives the presence of the power.
The maximum speed is 115200 baud. The level adapter component, an SP3232BCN, gives the protection to the electrostatic charge up to 15KV.
The setting up of the power is done using a proper setting of the J1 and J3 connector:
- To power the circuit from the COM port set the jumper on the J1 connector as illustrated into the following picture.
- To power the circuit form the J3 connector set the jumper on the J1 connector as illustrated into the following picture.
Setting up ot the 3,3 Volt or 5 Volt power using the J2 connector
- 3,3V RX/TX signals jumper on J2
- 5V RX/TX signals J2 without jumper
Component position and Jumper setting up:
The J3 connector:
pin GND (1) it should be connected to the GND of the external circuit
pin RX (2) it is the receiver pin on the DB9 and it should be connected to the RX pin of the circuit
pin TX (2) it is the transmitter pin on the DB9 and it should be conected to the TX pin of the circuit
pin VCC (4) it should be connected to the power pin of the adapter if the DB9 isn’t used to take the poser see the J1 selector.
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