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SN75LV4737A: RS232 lost connection

Part Number: SN75LV4737A

hi,

One of my customer old design is using DS14C335MSA, TI has suggest to replace it with SN75LV4737ADBR. My customer has follow the advice but now they are facing lost link issue. Note this is just the suspect, below is the portion of the design. I attached the UART terminal of the output to show you as well. Hopefully some expert here can advice me what go wrong.

Note: (/EN and STBY) pin5 & pin 23 is direct routed to GND

 

 

Below is the example communication error between Channel 3 & 4 (but in our LINUX OS stated port 6&7 respectively).

1.) Please note that from line 01/12/16 08:42:50 , port 6 (channel3) set as transmit (we fix the data to be 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff 01 23 45 67 89 ab cd ef), port 7 (channel 4) set as receive mode, you can see initially first line 01/12/16 08:42:50 it can receive until 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee only, after that next line one more random data 00, after that no more data received or unable to receive any more data. 

 

2.) Please note that from line 01/12/16 08:43:10, port 7 (channel 4) set as transmit, port 6 (channel 3) set as receive mode, initially it can receive the correct data but until 01/12/16 08:43:27, after that only read as 00 all the way till the end..

Below is the RS communication output

#### Channel 3 = PORT6 on linux OS
### set as TRANSMIT MODE
syslink@rtu2-c1-s0-cpu:~ ./test_com -d1 -y4 -b12 -t500 -n /dev/ttyS6
01/12/16 08:42:50  < 1227>  ERROR   Unrecognized hex character
01/12/16 08:42:50  < 1227>  DEBUG   Opening RS232 master
01/12/16 08:42:50  < 1227>  DEBUG   Initialize comm
01/12/16 08:42:50  < 1227>  DEBUG   init port - PORT:/dev/ttyS6, Timeout:500
01/12/16 08:42:50  < 1227>  DEBUG   Baud Rate        = 115200
01/12/16 08:42:50  < 1227>  DEBUG   Parity           = 8-bit None
01/12/16 08:42:50  < 1227>  DEBUG   RTS              = Always Low
01/12/16 08:42:50  < 1227>  DEBUG   initialise_state() - /dev/ttyS6 UnsetRTS-OK
01/12/16 08:42:50  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:50  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:42:51  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:51  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:42:51  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:51  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:42:52  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:52  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:42:52  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:52  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:42:53  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:53  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:42:54  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:54  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:42:54  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:54  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:42:55  < 1227>  DEBUG   |/dev/ttyS6 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:42:55  < 1227>  DEBUG   |/dev/ttyS6         => ff 01 23 45 67 89 ab cd ef

### Channel 4 = PORT 7 in Linux OS
### set as RECEIVE MODE
syslink@rtu2-c1-s0-cpu:~ ./test_com -d1 -y1 -b12 -t500 -n /dev/ttyS7
01/12/16 08:42:48  < 1220>  ERROR   Unrecognized hex character
01/12/16 08:42:48  < 1220>  DEBUG   Opening RS232 slave
01/12/16 08:42:48  < 1220>  DEBUG   Initialize comm
01/12/16 08:42:48  < 1220>  DEBUG   init port - PORT:/dev/ttyS7, Timeout:500
01/12/16 08:42:48  < 1220>  DEBUG   Baud Rate        = 115200
01/12/16 08:42:48  < 1220>  DEBUG   Parity           = 8-bit None
01/12/16 08:42:48  < 1220>  DEBUG   RTS              = Always Low
01/12/16 08:42:48  < 1220>  DEBUG   initialise_state() - /dev/ttyS7 UnsetRTS-OK
01/12/16 08:42:50  < 1220>  DEBUG   |/dev/ttyS7 (16)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:42:50  < 1220>  DEBUG   |/dev/ttyS7         <= 00

When I reverse the TX and RX, below is the result

syslink@rtu2-c1-s0-cpu:~ ./test_com -d1 -y4 -b12 -t500 -n /dev/ttyS7
01/12/16 08:43:10  < 1289>  ERROR   Unrecognized hex character
01/12/16 08:43:10  < 1289>  DEBUG   Opening RS232 master
01/12/16 08:43:10  < 1289>  DEBUG   Initialize comm
01/12/16 08:43:10  < 1289>  DEBUG   init port - PORT:/dev/ttyS7, Timeout:500
01/12/16 08:43:10  < 1289>  DEBUG   Baud Rate        = 115200
01/12/16 08:43:10  < 1289>  DEBUG   Parity           = 8-bit None
01/12/16 08:43:10  < 1289>  DEBUG   RTS              = Always Low
01/12/16 08:43:10  < 1289>  DEBUG   initialise_state() - /dev/ttyS7 UnsetRTS-OK
01/12/16 08:43:10  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:10  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:11  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:11  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:11  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:11  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:12  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:12  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:12  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:12  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:13  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:13  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:14  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:14  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:14  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:14  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:15  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:15  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:16  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:16  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:16  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:16  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:17  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:17  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:18  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:18  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:18  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:18  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:19  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:19  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:20  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:20  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:20  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:20  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:21  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:21  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:22  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:22  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:22  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:22  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:23  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:23  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:24  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:24  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:24  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:24  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:25  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:25  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:25  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:25  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:26  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:26  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:27  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:27  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:27  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:27  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:28  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:28  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:29  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:29  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:29  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:29  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:30  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:30  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:31  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:31  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:31  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:31  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:32  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:32  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:33  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:33  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:33  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:33  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:34  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:34  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:34  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:34  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:35  < 1289>  DEBUG   |/dev/ttyS7 (24)    => 00 11 22 33 44 55 66 77 88 99 aa bb cc dd                  ee
01/12/16 08:43:35  < 1289>  DEBUG   |/dev/ttyS7         => ff 01 23 45 67 89 ab cd ef

### SET AS RECEIVE MODE
syslink@rtu2-c1-s0-cpu:~ ./test_com -d1 -y1 -b12 -t500 -n /dev/ttyS6
01/12/16 08:43:08  < 1282>  ERROR   Unrecognized hex character
01/12/16 08:43:08  < 1282>  DEBUG   Opening RS232 slave
01/12/16 08:43:08  < 1282>  DEBUG   Initialize comm
01/12/16 08:43:08  < 1282>  DEBUG   init port - PORT:/dev/ttyS6, Timeout:500
01/12/16 08:43:08  < 1282>  DEBUG   Baud Rate        = 115200
01/12/16 08:43:08  < 1282>  DEBUG   Parity           = 8-bit None
01/12/16 08:43:08  < 1282>  DEBUG   RTS              = Always Low
01/12/16 08:43:08  < 1282>  DEBUG   initialise_state() - /dev/ttyS6 UnsetRTS-OK
01/12/16 08:43:10  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:10  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:11  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:11  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:11  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:11  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:12  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:12  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:12  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:12  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:13  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:13  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:14  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:14  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:14  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:14  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:15  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:15  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:16  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:16  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:16  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:16  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:17  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:17  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:18  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:18  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:18  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:18  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:19  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:19  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:20  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:20  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:20  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:20  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:21  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:21  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:22  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:22  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:22  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:22  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:23  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:23  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:24  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:24  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:24  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:24  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:25  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:25  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:25  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:25  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:26  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:26  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:27  < 1282>  DEBUG   |/dev/ttyS6 (24)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:27  < 1282>  DEBUG   |/dev/ttyS6         <= ff 01 23 45 67 89 ab cd ef
01/12/16 08:43:27  < 1282>  DEBUG   |/dev/ttyS6 (16)    <= 00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee
01/12/16 08:43:27  < 1282>  DEBUG   |/dev/ttyS6         <= ff
01/12/16 08:43:28  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:29  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:29  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:30  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:31  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:31  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:32  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:33  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:33  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00
01/12/16 08:43:34  < 1282>  DEBUG   |/dev/ttyS6 (1)     <= 00

Hope to get some advise where can go wrong?

Best regards,

Kpk