RL78 G16 Modbus application note

Hi 

I tried implementing the application note r01an6961ej0110-rl78g16-modbus. I am able to run the code but facing some issues while returning of Modbus frame. Using the MCU as Modbus RTU slave and Modbus poll software as master to check data. 

The issue is the slave returns frame when master sends data twice! that is the Modbus Poll software sends Modbus read request two times and the slave responds to only one. The Modbus poll logs are attached.  

Is this some timer error or framing error I even tried sending the Modbus frame manually using the computer terminal there also when I send the Frame twice the slave returns only once!

Tx:20-12:55:13.676-01 01 00 00 00 07 7D C8
Tx:21-12:55:16.724-01 01 00 00 00 07 7D C8
Rx:22-12:55:16.770-01 01 01 7F 10 68
Tx:23-12:55:17.784-01 01 00 00 00 07 7D C8
Tx:24-12:55:20.814-01 01 00 00 00 07 7D C8
Rx:25-12:55:20.861-01 01 01 7F 10 68
Tx:26-12:55:21.875-01 01 00 00 00 07 7D C8
Tx:27-12:55:24.916-01 01 00 00 00 07 7D C8
Rx:28-12:55:24.962-01 01 01 7F 10 68
Tx:29-12:55:25.969-01 01 00 00 00 07 7D C8
Tx:30-12:55:28.993-01 01 00 00 00 07 7D C8
Rx:31-12:55:29.039-01 01 01 7F 10 68
Tx:32-12:55:30.047-01 01 00 00 00 07 7D C8
Tx:35-12:50:50.278-01 03 00 00 00 07 04 08
Tx:36-12:50:51.319-01 03 00 00 00 07 04 08
Rx:37-12:50:51.365-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:38-12:50:51.867-01 03 00 00 00 07 04 08
Tx:39-12:50:52.978-01 03 00 00 00 07 04 08
Rx:40-12:50:53.024-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:41-12:50:53.525-01 03 00 00 00 07 04 08
Tx:42-12:50:54.635-01 03 00 00 00 07 04 08
Rx:43-12:50:54.680-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:44-12:50:55.185-01 03 00 00 00 07 04 08
Tx:45-12:50:56.297-01 03 00 00 00 07 04 08
Rx:46-12:50:56.343-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:47-12:50:56.845-01 03 00 00 00 07 04 08
Tx:48-12:50:57.958-01 03 00 00 00 07 04 08
Rx:49-12:50:58.003-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:50-12:50:58.506-01 03 00 00 00 07 04 08
Tx:51-12:50:59.615-01 03 00 00 00 07 04 08
Rx:52-12:50:59.661-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:53-12:51:00.162-01 03 00 00 00 07 04 08
Tx:54-12:51:01.274-01 03 00 00 00 07 04 08
Rx:55-12:51:01.326-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:56-12:51:01.822-01 03 00 00 00 07 04 08
Tx:57-12:51:02.935-01 03 00 00 00 07 04 08
Rx:58-12:51:02.981-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:59-12:51:03.485-01 03 00 00 00 07 04 08
Tx:60-12:51:04.598-01 03 00 00 00 07 04 08
Rx:61-12:51:04.658-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:62-12:51:05.159-01 03 00 00 00 07 04 08
Tx:63-12:51:06.274-01 03 00 00 00 07 04 08
Rx:64-12:51:06.319-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:65-12:51:06.824-01 03 00 00 00 07 04 08
Tx:66-12:51:07.937-01 03 00 00 00 07 04 08
Rx:67-12:51:07.982-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:68-12:51:08.484-01 03 00 00 00 07 04 08
Tx:69-12:51:09.595-01 03 00 00 00 07 04 08
Rx:70-12:51:09.641-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:71-12:51:10.146-01 03 00 00 00 07 04 08
Tx:72-12:51:11.258-01 03 00 00 00 07 04 08
Rx:73-12:51:11.303-01 03 0E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 EF 15
Tx:74-12:51:11.805-01 03 00 00 00 07 04 08