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AFE-E630 COM0、COM1

UART（RS232 or RS485）​

Configure RS232 or RS485​

Only ttyS3 and ttyS4 support RS485 mode and the default mode is RS485. Set RS232 or RS485 separately (0 means to RS232; 1 means to RS485): Set ttyS3 to RS232 mode and ttyS4 to RS232 mode

# fw_setenv uart_mode_cpu 3:0,4:0
# reboot

Set ttyS3 to RS232 mode and ttyS4 to RS485 mode

# fw_setenv uart_mode_cpu 3:0,4:1
# reboot

Set ttyS3 to RS485 mode and ttyS4 to RS232 mode.

# fw_setenv uart_mode_cpu 3:1,4:0
# reboot

Set ttyS3 to RS485 mode and ttyS4 to RS485 mode.

# fw_setenv uart_mode_cpu 3:1,4:1
# reboot

For example, set COM0 ,“Baud rate” to 115200 ,“Data bits” to 8,“Stop bits” to 1,“Parity” to None,“Flow control” to None.

# stty -F /dev/ttyS3 115200 cs8 -parenb -cstopb -crtscts

Send and Receive Data​

The following figure shows the connection mode.

COM0_GND=>COM1_GND

COM0_RS232-TX=>COM1_RS232-TX

COM0_RS485+/RS232-RX=>COM1_RS485+/RS232-RX

COM0_RS485-=>COM1_RS485-

Taking COM0 as receiver and COM1 as sender(RS485) :

# #---- COM0 as receiver ----# #
# stty -F /dev/ttyS3 115200 cs8 -cstopb -parenb -crtscts
# cat /dev/ttyS3 &

# #---- COM1 as sender ----# #
# stty -F /dev/ttyS4 115200 cs8 -cstopb -parenb -crtscts
# echo pass > /dev/ttyS4

# #----If no error, the receiver will receive “pass”----# #
pass

Note:

1、Receiver should run before sender.

2、The “serial port parameters” should be the same for sender and receiver.