diff --git a/app/app-prime-modbus/app/app-prime-modbus/rs485_serial.c b/app/app-prime-modbus/app/app-prime-modbus/rs485_serial.c
index 4e25232..7fc630a 100644
--- a/app/app-prime-modbus/app/app-prime-modbus/rs485_serial.c
+++ b/app/app-prime-modbus/app/app-prime-modbus/rs485_serial.c
@@ -765,7 +765,7 @@ int rs485_initialize( void){
         printf( "ini file error.\n");
         return -1;
     } else {
-        char    *dev_uart   = ini_read_string ( inifile, "uart", "devname"  , "/dev/ttyUSB0" );
+        char    *dev_uart   = ini_read_string ( inifile, "uart", "devname"  , "/dev/ttymxc2" );
         int      baud       = ini_read_integer( inifile, "uart", "baud"     , 19200          );
 
         printf( "dev_uart   = %s\n", dev_uart);