BrightSign GPIO 'RX' Interface

for any BrightSign units w/GPIO

RX_GPIO Board    

Features:

• small footprint (2.0 x 1.6)
• RX (receive only) board for Serial control to the BrightSign GPIO
• Baud set to 19200, N, 8, 1
• Direct mount to the GPIO using the attaching screws provided
• No external power required.
• On board LED to show that the processor is running.
• RS232 Cable (Not Null Modem Crossover Cable)

Use this board for controlling the GPIO of a BrightSign using external serial device.

Note: This board can be configured with a terminal block for two wire serial connection (ground and TX). (consult HMS for this option).

Note: This board can be configured for TTL operation (consult HMS for this option).

Note: The standard computer DB9 connections (or USB-DB9 adapter) is pin 5 = ground, pin 3 = TX.

Control Byte:

Send a single byte to control GPIO-0 through GPIO-7.  Sending a '1' sets GPIO-0 low causing a GPIO event.  Only the signal going low causes the 'GPIO event'.  You can leave the signal as is or send a zero after about 35 milliseconds.  This 35 millisecond delay is needed because the BrightSign only polls the GPIO about every 30 milliseconds.

GPIO Bits

• 1 = GPIO-0
• 2 = GPIO-1
• 4 = GPIO-2
• 8 = GPIO-3
• 16 = GPIO-4
• 32 = GPIO-5
• 64 = GPIO-6
• 128 = GPIO-7

Add the numbers together to set any combination of GPIO pins to go low.

Last Revised: 03/02/2024