Sending CTRL+Z to Modem

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Randy - 26 Apr 2005 21:17 GMT

I have an application that can instruct a cellular modem to send an SMS text
message. To be sent in HyperTerminal, CTRL and Z must be held together
before the message can be sent. How do I output CTRL+Z to the modem
programatically?

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Ken Halter - 26 Apr 2005 21:19 GMT

>I have an application that can instruct a cellular modem to send an SMS
>text
> message. To be sent in HyperTerminal, CTRL and Z must be held together
> before the message can be sent. How do I output CTRL+Z to the modem
> programatically?

Send a Chr$(26)...

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Randy - 26 Apr 2005 21:38 GMT

Ken,

Thank you very much for the fast reply. Chr(26) is the colon character.
How does this translate to CTRL+Z? Does this mean if someone included a
colon in their message it would be interpreted as a CTRL+Z and the message
would be sent unexpectedly?

Randy

> >I have an application that can instruct a cellular modem to send an SMS
> >text
[quoted text clipped - 3 lines]
>
> Send a Chr$(26)...

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Karl E. Peterson - 26 Apr 2005 21:52 GMT

> Thank you very much for the fast reply. Chr(26) is the colon
> character.

Umm, no.

Debug.Print Asc(":")

> How does this translate to CTRL+Z?

It's a historical thing. That's the way ASCII works. The first 26 were control
chars.

> Does this mean if
> someone included a colon in their message it would be interpreted as
> a CTRL+Z and the message would be sent unexpectedly?

Absolutely not.

Later... Karl

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Dick Grier - 26 Apr 2005 21:53 GMT

Hi,

Chr(26) is control-Z, as Ken says. The colon is Chr(58).

Dick

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Richard Grier (Microsoft Visual Basic MVP)

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Author of Visual Basic Programmer's Guide to Serial Communications, 4th
Edition ISBN 1-890422-28-2 (391 pages) published July 2004. See
www.mabry.com/vbpgser4 to order.

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Randy - 26 Apr 2005 22:18 GMT

Thanks everyone,

My bad. I was looking at the chart wrong. Sorry.

Randy

> Hi,
>
> Chr(26) is control-Z, as Ken says. The colon is Chr(58).
>
> Dick

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VB Forum / COM / April 2005

Sending CTRL+Z to Modem