PPP NULL modem Dial-out

Here is a note from abstract.txt

NOTE: Serial interface uses only TXD, RXD and GND signals from the
      RS232 line. However in most cases some additional connections
      are required by the PC COM interface. For a 9-PIN standard
      connector you should therefore connect the pin 7 (RTS) to
      pin 8 (CTS) and pin 1 (CD) to pin 4 (DTR) and to pin 6 (DSR).

Windows are not happy with only TXD and RXD. Have you connected also the other pins?

Franc

Here is a note from abstract.txt

NOTE: Serial interface uses only TXD, RXD and GND signals from the
      RS232 line. However in most cases some additional connections
      are required by the PC COM interface. For a 9-PIN standard
      connector you should therefore connect the pin 7 (RTS) to
      pin 8 (CTS) and pin 1 (CD) to pin 4 (DTR) and to pin 6 (DSR).

Windows are not happy with only TXD and RXD. Have you connected also the other pins?

Franc

Windows are not happy with only TXD and RXD

My connection is perfectly happy with RX, TX and GND.

ummmm...now that you reminded me of that,well the MCB2100 Keil board does not have the COM1's handshake lines connected to the physical connector. :( http://www.keil.com/mcb2100/mcb2100-schematics.pdf

That means i've to do some hardware soldering on this board? BAD!

Now i'm not sure i can even get the MODEM to work...

Some serious set-backs there...

Thanks a lot for pointing that out...

Regards,

Akshat

@ Tamir,

are you using the PPP over NULL-MODEM? Are you dialing out to windows? If so, please help me with a step-by-step guide...

I'm able to dial-in into the keil board from windows using a "Direct cable connection b/w 2 comps..". But not the other way round.

Thanks and regards,

Akshat

But what about the Windows PPP Dial-up networking? Have you tried it? I have and I had problems until I have connected also the missing RS232 signals.

Franc

OK to clear up some things here is what i did:
WORKING:
Under windows:
1. Installed a NULL MODEM.
2. Setup a new ppp dial-up connection using that modem.
3. Dial out using username-"Keil", password-"keil"

On uVision:
1. Setup ppp.
2. init_TcpNet()
3. init_modem()
4. modem_listem()
5. ppp_listen("","Keil","keil")

NOT WORKING:
Under Windows:
1. NULL MODEM installed
2. setup "incoming connections" on COM1
3.Add a user to incoming connection - Keil(keil)

On uVision:
1. init_TcpNet()
2. init_modem()
3. tout=1;
4. while (1) { timer_poll (); main_TcpNet (); modem_dial(""); if(modem if (tick == __TRUE) { if (ppp_is_up() == __FALSE) { IOSET1 = 0x55<<16; if (--tout == 0) { /* Connect to PPP server. */ ppp_connect ("","Keil","keil"); tout = 50; } } else { IOSET1 =0X20000;//my own }

tick = __FALSE; } }

Suggestions? faults?

Thanks and regards,

Akshat

Why solder on the board? Just bridge the signals on the cable - preferably on the connector on the Windows side. Then Windows will always be ready to send data.

Ya that could work, but still that would have to be done on the board itself, or will have to rip the cable apart(not possible), to bridge the lines.

Thanks and regards,

Akshat

Why modify an expensive board, when you can rip apart and modify a dirt-cheap cable? Or you could even build a new cable from scratch.

Remember that the cable may be project-specific, but you may use the board for other projects too.

:)

YUP point noted!

Thanks for the help.

Regards,

Akshat

Hello,

Well i put some debugging into place and the NULL modem connects and modem_is_up() returns true, but after that windows shows no activity! so i assume that PPP is not able to negotiate to windows xp. What can be wrong on that front? suggestions?

Thanks and regards,

Akshat

<SOLVED>

Stopped the "SERVER" service under Windows XP"

Akshat