4D systems gen4-HMI Series, Техническое описание

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gen4-HMI Display Modules
gen4-uLCD-50D Page 7 of 29 www.4dsystems.com.au
4. Hardware Interface - Pins
This section describes in detail the hardware interface
pins of the device.
4.1. Serial Ports – TTL Level Serial
The DIABLO16 Processor has three hardware
asynchronous serial ports (COM1 – COM3) that can be
configured on a variety of the processors GPIO pins.
TX/RX0 (COM0) is dedicated and its pins are fixed. All
of the DIABLO16’s serial ports can be used to
communicate with external serial devices.
TX/RX0 are referred to as COM0, and is the only one
used for programming the DIABLO16 itself.
The primary features are:

Full-Duplex 8 bit data transmission and
reception.

Data format: 8 bits, No Parity, 1 Stop bit.

Independent Baud rates from 300 baud up to
600K baud.

Single byte transmits and receives or a fully
buffered service. The buffered service feature
runs in the background capturing and
buffering serial data without the user
application having to constantly poll any of
the serial ports. This frees up the application
to service other tasks.
A single byte serial transmission consists of the start
bit, 8-bits of data followed by the stop bit. The start bit
is always 0, while a stop bit is always 1. The LSB (Least
Significant Bit, Bit 0) is sent out first following the start
bit. Figure below shows a single byte transmission
timing diagram.
COM0 is also the primary interface for User program
downloads, and configuration PmmC /Driver
programming. Once the compiled 4DGL application
program (EVE byte-code) is downloaded and the user
code starts executing, the serial port is then available
to the user application.
TX0 pin (Serial Transmit COM0):
Dedicated Asynchronous Serial port COM0 transmit
pin, TX0. Connect this pin to external serial device
receive (Rx) signal. This pin is 5.0V tolerant.
RX0 pin (Serial Receive COM0):
Dedicated Asynchronous Serial port COM0 receive pin,
RX0. Connect this pin to external serial device transmit
(Tx) signal. This pin is 5.0V tolerant.
TX1 pin (Serial Transmit COM1):
Asynchronous Serial port COM1 transmit pin, TX1.
Connect this pin to external serial device receive (Rx)
signal. This pin is 5.0V tolerant. This can be configured
to 1 of the GPIO pins, see table following.
RX1 pin (Serial Receive COM1):
Asynchronous Serial port COM1 receive pin, RX1.
Connect this pin to external serial device transmit (Tx)
signal. This pin is 5.0V tolerant. This can be configured
to 1 of the GPIO pins, see table following.
TX2 pin (Serial Transmit COM2):
Asynchronous Serial port COM2 transmit pin, TX2.
Connect this pin to external serial device receive (Rx)
signal. This pin is 5.0V tolerant. This can be configured
to 1 of the GPIO pins, see table following.
RX2 pin (Serial Receive COM2):
Asynchronous Serial port COM2 receive pin, RX2.
Connect this pin to external serial device transmit (Tx)
signal. This pin is 5.0V tolerant. This can be configured
to 1 of the GPIO pins, see table following.
TX3 pin (Serial Transmit COM3):
Asynchronous Serial port COM3 transmit pin, TX3.
Connect this pin to external serial device receive (Rx)
signal. This pin is 5.0V tolerant. This can be configured
to 1 of the GPIO pins, see table following.
RX3 pin (Serial Receive COM3):
Asynchronous Serial port COM3 receive pin, RX3.
Connect this pin to external serial device transmit (Tx)
signal. This pin is 5.0V tolerant. This can be configured
to 1 of the GPIO pins, see table following.