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Modem speed
I have a delphi program which uses modem component to connect from PC
side modem to a device side modem. I find that the program does not work with some kind of modems. (Some other kind of modems works very stable!) After connection my program will change the connection speed 19200 down to 9600. However, I find that when I do this, the connection terminates. Do anyone know why some kinds of modem will terminate the connection when I change speed and how to solve it? Because I cannot control which modem my client will use so that my program needs to work with different kinds of modems! Thanks! |
"terry" wrote in message m... I have a delphi program which uses modem component to connect from PC side modem to a device side modem. I find that the program does not work with some kind of modems. (Some other kind of modems works very stable!) After connection my program will change the connection speed 19200 down to 9600. However, I find that when I do this, the connection terminates. Do anyone know why some kinds of modem will terminate the connection when I change speed and how to solve it? Because I cannot control which modem my client will use so that my program needs to work with different kinds of modems! Thanks! |
"terry" wrote in message m... I have a delphi program which uses modem component to connect from PC side modem to a device side modem. I find that the program does not work with some kind of modems. (Some other kind of modems works very stable!) After connection my program will change the connection speed 19200 down to 9600. However, I find that when I do this, the connection terminates. Do anyone know why some kinds of modem will terminate the connection when I change speed and how to solve it? Because I cannot control which modem my client will use so that my program needs to work with different kinds of modems! Thanks! |
terry wrote:
I have a delphi program which uses modem component to connect from PC side modem to a device side modem. I find that the program does not work with some kind of modems. (Some other kind of modems works very stable!) After connection my program will change the connection speed 19200 down to 9600. However, I find that when I do this, the connection terminates. Do anyone know why some kinds of modem will terminate the connection when I change speed and how to solve it? Probably it's the software modems that do this. Not sure if there is a solution. These same modems are the ones that drop their internet connection if the connection isn't great. There may be a generic AT commend that will limit the modem speed on connection so you don't have to lower it later? http://www.engplanet.com/content/Modem.html -- Stacey |
"Stacey" wrote in message ... : terry wrote: : : I have a delphi program which uses modem component to connect from PC : side modem to a device side modem. I find that the program does not : work with some kind of modems. (Some other kind of modems works very : stable!) : : After connection my program will change the connection speed 19200 : down to 9600. However, I find that when I do this, the connection : terminates. : : Do anyone know why some kinds of modem will terminate the connection : when I change speed and how to solve it? : : : : Probably it's the software modems that do this. Not sure if there is a : solution. These same modems are the ones that drop their internet : connection if the connection isn't great. There may be a generic AT commend : that will limit the modem speed on connection so you don't have to lower it : later? : : : http://www.engplanet.com/content/Modem.html : -- : : Stacey Unless you're using ancient modems most maodems "train" to a speed that is acceptable to both parties, even the software ones. Try setting your modem at 115200kb and see what happens.It should train automatically. claus |
santa wrote:
"Stacey" wrote in message ... : terry wrote: : : I have a delphi program which uses modem component to connect from PC : side modem to a device side modem. I find that the program does not : work with some kind of modems. (Some other kind of modems works very : stable!) : : After connection my program will change the connection speed 19200 : down to 9600. However, I find that when I do this, the connection : terminates. : : Do anyone know why some kinds of modem will terminate the connection : when I change speed and how to solve it? : : : : Probably it's the software modems that do this. Not sure if there is a : solution. These same modems are the ones that drop their internet : connection if the connection isn't great. There may be a generic AT commend : that will limit the modem speed on connection so you don't have to lower it : later? : : : http://www.engplanet.com/content/Modem.html : -- : : Stacey Unless you're using ancient modems most maodems "train" to a speed that is acceptable to both parties, even the software ones. Try setting your modem at 115200kb and see what happens.It should train automatically. claus I think their problem is the software tries to =switch= the speed lower and when it does, some modems drop the connection. Very few newer "software" modems allow for variable speeds once they connect and once they've done the handshake and set the connection speed, that's it. I was thinking they might be able to =force= the modem to connect at 9600 right off the bat rather than trying to switch it to that speed after it connects to avoid dropping the connection. -- Stacey |
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