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- Path: news.ICSI.Net!cdbiem
- From: cdbiem@roo.netrax.net (Charles Biemiller X0024)
- Newsgroups: comp.dcom.modems
- Subject: Help-No flow control/IRQ3
- Date: 28 Mar 1996 02:09:01 GMT
- Organization: Internet Connect Services, Inc.
- Message-ID: <4jcsbt$6e0@monet.ICSI.Net>
- NNTP-Posting-Host: ns1.netrax.net
- X-Newsreader: TIN [version 1.2 PL2]
-
- I hope you will be able to help me with a problem that I have been
- working on for days.
-
- I am having problems controlling my modem. The modem is an internal 1442
- fax/data modem, model AFEP-V1 .510-BP39 ROCKWELL RPI (TM) MODEM with data
- pump model RC144DPi Rev CA. The modem is set on serial port 2 with IRQ3.
- My computer is an IBM PC compatible computer with an 8088 processor.
-
- The modem ignores any type of flow control, whether it is XON or XOFF or
- RTS/CTS. When I send a XOFF char to the modem it ignores it and sends
- data anyway. With XON/XOFF flow control I use the command &K4. With
- RTS/CTS flow control, when I clear the RTS bit on port 2FCh (bit 1) the
- modem still sends data. With hardware flow control I use the command &K3.
-
- The other problem I am having is that the modem will not generate an IRQ3
- when there is data ready from the modem. IRQ3 is allowed by my
- Programmable Interrupt Controller and I changed the vector of Interrupt
- 0Bh to point to my interrupt handler, but it is never called. I wrote to
- port 2F9h (interrupt enable register) to enable an interrupt on data
- available (bit 0) but the modem will not generate the interrupt.
-
- I know the modem is not at fault, because it works fine with my
- communications software. Therefore, I must be doing something wrong.
- Please let me know what you think is going wrong.
-
-
- Thank You,
- Charlie Biemiller
-
-