Forums | Other (Public) | Modem disconnects when serial port closed | Watch |
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marek Tl Posts: 3 United Kingdom | Posted - 4/22/2004 1:35:40 AM I am using a piece of software that takes data in to the serial port. The data is from a GPS receiver (NMEA data) I want to put a modem between the GPS receiver and the PC so that the GPS data comes from a remote site. The GPS software does not support modem dial-up so I am trying to fool it into thinking the data from the modem is the GPS receiver. Is there any way I cn get the modem only to disconnect on an ATH command rather than when windows closes the reference to the serial port? Many thanks |
v.Richard Tl Posts: 6222 USA | Posted - 4/23/2004 9:12:57 AM If you use an external serial modem, you could connect the modem to PC via a breakout box (or specially wired cable) and prevent modem from disconnecting when port is closed. It may be possible with internal modem if the internal is a full hardware-controller-based modem that supports commands to disable hangup on drop of DTR.
Aloha! Richard. |
marek Tl Posts: 3 United Kingdom | Posted - 4/27/2004 6:02:06 AM Do you know which line to break into for this? Does the line to the modem then need pulling high or low? Thanks
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v.Richard Tl Posts: 6222 USA | Posted - 4/30/2004 2:08:42 PM Breakout box - Supply the modem with high voltage (+5V) on the DTR line by breaking it out from the PC - Aloha! Richard. |
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