Error: Mode COM2 command failed.

I'm trying to use the Mode command as outlined on this page: http://www.keil.com/support/man/docs/uv4/uv4_db_srl_io_to_com.htm And I'm getting an error: > MODE COM2 9600, 0, 8, 1 Mode COM2 command...
Error: Mode COM2 command failed.

I'm trying to use the Mode command as outlined on this page: http://www.keil.com/support/man/docs/uv4/uv4_db_srl_io_to_com.htm And I'm getting an error: > MODE COM2 9600, 0, 8, 1 Mode COM2 command...
how can i program the COM2 of the reader

hello, with Com1 there isn't any problem. with Com2 there is a problem. SERIAL_PARAM Com1Cfg; BYTE res ; Com1Cfg.Port = G_COM1; Com1Cfg.Speed = 38400; Com1Cfg.CharSize = 8; Com1Cfg.Parity...
how can i program the COM2 of the reader

hello, with Com1 there isn't any problem. with Com2 there is a problem. SERIAL_PARAM Com1Cfg; BYTE res ; Com1Cfg.Port = G_COM1; Com1Cfg.Speed = 38400; Com1Cfg.CharSize = 8; Com1Cfg.Parity...
I can't use COM1

I'm tryng to read/write from/to COM1 serial port, but i don't know how. I programe in asembler Thanks