I am sorry, i have said one mistake. In fact, with rs485 in NMEA mode I do not query, it is fmb125 that just send to me periodically. And you were right, I have tried NMEA mode with rs232 and it worked the same way of rs485.
Just to conclude:
- > It is not possible to receive NMEA data on the rs232 external device using tcp binary mode?
-> If the answer is no, it is possible for rs232 external device to change fmb125 mode on demand? (Switching from binary mode to nmea, and the other way around)