Registered: Dec 1999
Location: Connecticut USA
Posts: 2682

I've looked for an answer to this and can't seem to find one...

In the Prefs app, on the Modem panel, there is a setting for Flow Control. According to the Visor manual, it says that the settings are:

Automatic
On (XOn)
Off (XOff)

My confusion comes from the On and Off settings. My guess is that On really means XOn/XOff flow control while Off means no flow control at all. Could there be a misprint in the manual? I'd also like to know exactly what Automatic is, especially since the Visor has no handshaking lines on the HotSync connector.

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God bless America, my home sweet home...

Registered: Jan 2000
Location:
Posts: 434

For starters, I'm fairly certain that the modem settings are applicable to Springboards. I'm uncertain if it is possible to get them to work for the IR or the USB/Serial ports without special software.

Registered: Dec 1999
Location: Connecticut USA
Posts: 2682

quote:

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Originally posted by yucca
I'm uncertain if it is possible to get them to work for the IR or the USB/Serial ports without special software.

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They do seem to have an effect on the serial port. I've been toying with my Visor connected to en external modem and so far, the only setting that seems to work is Off (as so many others have pointed out in the various threads on the subject). I know hardware flow control won't work (no RTS, DTR, etc), but Xon/Xoff should since it's software based (unless of course the serial library on the Visor doesn't implement it).

Basically, at this point I'm just curious as to the specifics. Someday I'll own a real Springboard modem (can you say Sixpak?) and none of this will matter.

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God bless America, my home sweet home...

Registered: Jan 2000
Location:
Posts: 434

quote:

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. . . but Xon/Xoff should since it's software
based (unless of course the serial library on the Visor doesn't implement it).

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Registered: Dec 1999
Location: Connecticut USA
Posts: 2682

It's all clear as mud...

Apparently, the Visor SerialManager (or whatever it's called) first looks for a Springboard-based modem. If none is found, it looks to the serial port. Nobody has confirmed this as yet, but it certainly seems to work that way since I can connect to an external modem. It may even be that the serial calls are mapped to BOTH at the same time (if I had a modem module I could test this theory).

There just doesn't seem to be much detail about the Visor hardware itself. I've looked at some of the code for the serial library but, not being a programmer, I can't make much sense from it.

A while back, HSDevSupport indicated to me that ALL serial calls were routed to the Springboard except in 2 instances: 1) HotSync (of course) and 2) keyboards (as in pin #2 KBD tied to ground). Obviously, this is not the case (again, an external modem works, as well as all those who have intefaced to GPS's). I fell for it hook, line, and sinker back then

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God bless America, my home sweet home...