AW: [En-Nut-Discussion] Modem to ethernut conections from PPPCapplication program

[Ernst Stippl]

Hi Jerome!

The wiring you show is OK to connect a DTE (terminal/host) to a DCE (modem).
The modem-side wiring you show will NOT allow you to use ahrdware ahndshake,
because HW handshake needs signals to be exchanged between the DTE and the
DCE besides RX/TX data. 
I guess there are some details to be looked at:
1) hardware: are you using Ethernut 1,2, or 3? if: 2 then which UART (0 or
1)
   how are the jumpers connecting the MCU/level converters set/connected to
the DB9 connector. is the Ethernut REALLY a DTE (from the DB9 pin usage
point of view) 
2) software: which async drivers are you using?

hth

ernst
-----Ursprüngliche Nachricht-----
Von: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] Im Auftrag von
Jerome.Dsouza at mt.com
Gesendet: Donnerstag, 29. Juni 2006 10:43
An: en-nut-discussion at egnite.de
Betreff: [En-Nut-Discussion] Modem to ethernut conections from
PPPCapplication program

Dear All,
 
I am a little confused about the modem cable connections to be done for
establishing PPP using a US robotics modem, does the NUT os provide the
driver code for hardware handshaking using te UART driver. 
If yes then how can I enable it in the pppc application code.
 
 
Am I right about the connections required between ethernut board and the
modem. 
 
 
With the Ethernut board functioning as DTE -  
 
   DTE                                      DCE or Modem    
 
1  DCD                                 1  DCD-----------        Pin No.s 1,
4, 6 of modem short
2  RX------------------------2  RX                   |
3  TX------------------------3  TX                   |
4  DTR                                  4  DTR---- -------    
5  GND----------------------5  GND                |
6  DSR                                  6  DSR-----------
7  RTS                                    7  RTS------------|
Pin Nos. 7 & 8 short
8  CTS                                    8  CTS-----------|
 
 
Please correct me if I am wrong.
 
Regards,
Jerome
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