01-04-2002
A Modem Dailer
I am trying to write a Modem Dialer Software on SCO unix platform. I have successfully opened /dev/tty1A port and made following port setings
[Server Side]
Input Mode = 0 ( None )
OutPut Mode = 0 ( None )
Hardware Control Mode = 8 Bits , Enable Receiver , Drop DTR when application terminates , Bi-Direction Flow Control
Disable Special Control Characters except START, STOP , VMIN , VTIME
I have successfully got a response from Modem as "OK" for both "AT" & "ATZ" commands. I have connected the Modem to my intercom line. At an other PC i am running the client software which has the same setup for port /dev/tty2A as of Server and a Modem connected at its end which in turn is connected to the intercom line
I am completely unable to transfer data from Server/Client to Clinet/Server PC. When I write "ATD phone_numberW\r" command at the client side , I am able to trace "RING" event at Server side. But after that the code goes for a toss stating at client side "NO DIALTONE" or "BUSY" or "HANGUP".
Kindly guide me the Know how of modem Programming stating
1) How to detect what Modem Make I am using?
2)What is the generic Modem Init strings?
3)What are the sequences of Command to be intiated from Client and Server side to Modem and what will be the EXPECTED responses ?
4) Are my port settings correct ?
5) How can I transfer data from PC to PC using Modems at both ends.
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dhb(4) Kernel Interfaces Manual dhb(4)
Name
dhb - DHB32 communications multiplexer
Syntax
device dmb0 at vaxbi? node? flags 0x????
vector dmbsint dmbaint dmblint
Description
A DHB32 device provides 16 asynchronous communication lines with full modem control. The DHB32 and the DMB32 share a common software
device driver. For this reason, the configuration line is the same for both the DHB32 and DMB32.
Each line attached to a DHB32 serial line port behaves as described in Input and output for each line can independently be set to run at
any of 16 speeds. See for the encoding.
Bit i of flags may be specified for a to say that a line should be treated as a hardwired connection with carrier always present. If bit i
of flags is not set, the line will operate under full modem control. Modem lines will operate in accordance to the CD (carrier detect),
DSR (data set ready) and CTS (clear to send) leads. Thus, specifying ``flags 0x0004'' in the specification of would cause line 2 on the
DHB32 to be treated as hardwired with carrier always present. In this example, the remainder of the lines will be modem control lines.
Diagnostics
dmbinit: async lines unavailable
This message is produced at system boot time if the DHB32 fails its internal self test indicating that the asynchronous lines have failed
to configure.
dmb%d: fifo overflow
The character input fifo overflowed before it could be serviced. This can happen if the CPU is running with elevated priority for too long
a period of time. Overflow errors may indicate that configuration constraints have been reached.
dmb%d: DMA Error. tbuf = 0x%x
A DMA output transfer failed. This problem can result from a memory error or an invalid pte (page table entry). For a description of the
error code in the ``tbuf'' register. See the DHB32 documentation.
dmb%d: DMB Hardware Error. TX.DMA.START failed
The failed to clear the start bit. Normally, this is cleared to signal that a DMA transfer has completed.
dmb%d: Modem Error. tbuf = 0x%x
Indicates a problem with a modem or its cable. For a description of the error code in the ``tbuf'' register. See the DHB32 documentation.
dmb%d: Internal Error. tbuf = 0x%x
Indicates that the DHB32 detected an internal error. For a description of the error code in the ``tbuf'' register. See the DHB32 User
Guide.
Files
(modem lines only)
See Also
tty(4), MAKEDEV(8), dmbsp(4)
dhb(4)