FabulaTech Forum Newbie
Re: split emulated serial port?
« Reply #2 on: Apr 14th, 2005, 4:46pm »
Andrew, thanks for the reply.
I tested the trial version. It is usable, but there is a couple of inconviniences I would like to be resolved.
I want to access a remote device through its serial port. (Use of an IP network is not an option.) The device has a modem attached to its serial port. Locally, I have a laptop computer (Windows XP SP2) with a built-in software modem (on COM3) and no (hardware) serial ports. The control software for the device works through serial ports.
I did the following: created two splitted ports, COM1 and COM2 (I could use shared ports to the same result). Installed a Standard Modem on COM1. Then, connected to the remote modem with Hyperterminal. Then I run the device control software using the COM2 port. It worked!
But there are disadvantages:
1) For this setup to work, I had to initialize the second, "Standard" modem to the &d0 state, which causes the modem to ignore the state of the DTR signal. Otherwise, the modem would disconnect when the control software opens the port.
Would it be possible (in future versions of your splitter) to add some control over serial port control lines, so that there be no need in that &d0 setting?
The disadvantage of using &d0 is that the modem does not disconnect when the programs terminate.
2) If, instead of attaching a second modem, I try to use the modem already existing in the system, the control software can not open the spliited port ("the port is in use by another application" or something).
Would it be possible modify the spliiter to enable the use of the existing modem instead of attaching yet another one?