Serial Modes

This section describes the procedure for setting up the Serial RS232 and RS485 modes. The folowing pins are used for the UART.


     Pin Name         Pin Number
     -----------      ----------
     uart1-buffer        136
     uart2-rs485          79
     uart2_5-bufs         35
     uart4-buffer         34
     uart5-rs485          78

RS232 Mode:

For RS232 mode, use the following. This would turn on all the buffers and make everything RS232.

UART1:


     echo 1 > /sys/class/gpio/export/uart1-buffer

UART2:


     echo 0 > /sys/class/gpio/uart2-rs485/value
     echo 1 > /sys/class/gpio/uart2_5-bufs/value

UART4:


     echo 1 > /sys/class/gpio/export/uart4-buffer

UART5:


     echo 0 > /sys/class/gpio/uart5-rs485/value
     echo 1 > /sys/class/gpio/uart2_5-bufs/value

RS485 Mode:

Only UART 2 and 5 support RS485 mode. The only change is to set the RS485 mode.

UART2:


     echo 1 > /sys/class/gpio/uart2-rs485/value
     echo 1 > /sys/class/gpio/uart2_5-bufs/value

UART5:


     echo 1 > /sys/class/gpio/uart5-rs485/value
     echo 1 > /sys/class/gpio/uart2_5-bufs/value