View source for EPC-R5710 Serial Port（RS-232、RS-422、RS-485）


For COM serial port pin definition, please refer to previous chapter 2.4 for more information.<br/> Self connect the TXD and RXD of each COM port

=== '''RS-232 loopback Test''' ===

Step 1:&nbsp; description<br/> COM2 and COM3 need to be configured under uboot as either of 232, 485, 422 modes<br/> Example both as 232:

{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
|-
| '''COM Port'''
| '''node'''
|-
| COM2
| /dev/ttymxc2
|-
| COM3
| /dev/ttymxc3
|}
<pre>u-boot=> setenv uart_mode 2:0,3:0
u-boot=> saveenv
Saving Environment to MMC...Writing to MMC(2)...<span style="color:#1abc9c;">OK</span>
u-boot=> reset
</pre>

Step 2: Example com2 test :
<pre># stty -F /dev/ttymxc2 -echo -onlcr 115200
# cat /dev/ttymxc2 &
# echo "Serial Port Test" > /dev/ttymxc2
Serial Port Test
</pre>

Example com3 test:
<pre># stty -F /dev/ttymxc3 -echo -onlcr 115200
# cat /dev/ttymxc3 &
# echo "okk" > /dev/ttymxc3
okk</pre>




=== '''RS-422 Test''' ===

'''Step 1: description'''<br/> COM2 and COM3 need to be configured under uboot as either of 232, 485, 422 modes<br/> Example both as 422:
<pre>u-boot=> setenv uart_mode 2:2,3:2
u-boot=> saveenv
Saving Environment to MMC... Writing to MMC(2)... OK
u-boot=> reset
</pre>

'''Step 2:&nbsp; Test RS-422 with Adam-4520I. Connect Adam-4520I to PC with DB9'''<br/> Adam-4520I to comX as the following;<br/> Adam-4520I RX- <--> DB9 Pin 1<br/> Adam-4520I RX+ <-->DB9 Pin 2<br/> Adam-4520I TX- <-->DB9 Pin 4<br/> Adam-4520I TX+ <--> DB9 Pin 3

'''Step3: Com2'''
<pre># stty -F /dev/ttymxc2 speed 115200 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
# cat /dev/ttymxc2 &
# echo "Serial Test" > /dev/ttymxc2
</pre>

[[File:EPC-R5710 RS422.png|1000x800px|EPC-R5710 RS422.png]]

'''Com3'''
<pre># stty -F /dev/ttymxc3 speed 115200 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
# cat /dev/ttymxc3 &
# echo "Serial Test" > /dev/ttymxc3
</pre>

[[File:EPC-R5710 RS422 1.png|1000x800px|EPC-R5710 RS422 1.png]]



=== '''RS-485 Test''' ===

'''Step1: description'''<br/> COM2 and COM3 need to be configured under uboot as either of 232, 485, 422 modes<br/> Example both as 485:
<pre>u-boot=> setenv uart_mode 2:1,3:1
u-boot=> saveenv
Saving Environment to MMC...Writing to MMC(2)...<span style="color:#1abc9c;">OK</span>
u-boot=> reset
</pre>

'''Step 2: Test RS-485 with Adam-4520I.Connect Adam-4520I to PC with DB9 cable.Connect Adam-4520I to COMX DB9 as the following:'''<br/> Adam-4520I Pin 1: Data- connect to DB9 Pin 1<br/> Adam-4520I Pin 2: Data+ connect to DB9 Pin 2

[[File:EPC-R5710 DB9 connector pin.png|RTENOTITLE]]

'''Step 3：Com2'''
<pre># stty -F /dev/ttymxc2 speed 115200 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
# cat /dev/ttymxc2 &
# echo test > /dev/ttymxc2
</pre>

[[File:EPC-R5710 RS-485.png|1000x800px]]

'''Step 4：Com3'''
<pre># stty -F /dev/ttymxc3 speed 115200 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
# cat /dev/ttymxc3 &
# echo test > /dev/ttymxc3
</pre>

[[File:EPC-R5710 RS485 COM3.png|1000x800px]]