Rev. 1: 13-04-2021
33
A Zone Features: Communications & RTC & uSD
10.1
RS-232
For the RS-232 communication protocol there is a switch that affects it. See the
Section 8
more information. If the RS-232 is being used, the Serial0 will be able disabled and not being
able for transmission nor a debug option.
Using the boards of Industrial Shields, there is a library that simplifies the RS-232
implementation.
10.2
RS-485 (Half Duplex)
The RS-485 protocol will be always enabled.
Using the boards of Industrial Shields, there is a library that simplifies the RS-485
implementation.
10.3
Ethernet
ESP32 ETHERNET&WIFI&BLUETOOTH PLC Ethernet port controller is based on w5500 IC, which
is the compatible IC compatible with Arduino Ethernet2 Shield libraries. All Ethernet shield
Arduino libraries are compatible with the ESP32 ETHERNET&WIFI&BLUETOOTH PLC.
10.1
BLE
This device has got Bluetooth Low Energy provided by the ESP32. It uses the 4.2 BR/EDR
version and BLE. The BLE is optimized for short burst data transmission, it uses the 2.4GHz ISM
Band, 40 channels (w/ 2MHz spacing), the channel usage method of FHSS, the GFSK
modulation. It has a power consumption of ~0.01x to 0.5x of reference (it depends on specific
usage). It can be used on different network topologies: mesh, broadcast and point-to-point.
10.2
RTC
ESP32 ETHERNET&WIFI&BLUETOOTH PLC RTC Module is based on the DS1307 Chip. This chip
works with the I2C protocol communication, so it is required to have enabled the I2C protocol.
Using the boards of Industrial Shields, there is a library that simplifies the RTC implementation
called RTC.
10.1
I2C pins
–
SDA/SCL
The I2C protocol is meant to work in a pull-up configuration. A pull-up configuration means
that when the pin is at rest (nothing connected to it) it always reads a HIGH value. In this case
it reads 3.3V when nothing is connected. The pull-up configuration is stablished by default in
these pins.
If it is meant to work them as a GPIO at 3.3V, it must be considered that they are pull-up
inputs.
Содержание ESP32
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