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- The CTTY Command of DOS 2.0
-
- Carl H. Pelto
- South East Michigan Computer Club
-
- There are two ways to use the CTTY
- command to drive an IBM PC with a
- remote terminal.
-
- 1. Direct Connection
-
- When computers and terminals are
- configured as DTE (data terminal
- equipment), the send and receive
- lines have to be swapped. Another
- way is to use a null modem
- adapter at the serial cable
- connection. With this connection
- made, type:
-
- MODE COM1:300,,,,
-
- To verify that the serial port is
- active and wired correctly to the
- other terminal, type:
-
- DIR>COM1
-
- This redirects the standard
- output of the DIR command to the
- initialized COM1 port to test the
- signal path. If the remote device
- sees the DIR results, you're all
- set. Then type:
-
- CTTY COM1
-
- Now run any DOS command from the
- remote terminal. When finished,
- type from the remote terminal:
-
- CTTY CON
-
- This restores control to the host
- IBM computer.
-
- 2. Modem Connection
-
- To use a smart modem with this
- command, develop two batch files
- to initialize the serial port and
- set the modem to auto answer. To
- create the first file, type:
-
- COPY CON:INIT.BAT
- AT SO=1
- F6
-
- F6 puts an end-of-file mark,
- control Z, at the end of the
- file. To create the second file,
- type:
-
- COPY CON:SETUP.BAT
- MODE COM1:300,,,,
- TYPE INIT.BAT>COM1
- CTTY COM1
- F6
-
- To set up for an incoming call,
- simply type:
-
- SETUP
-
- You will see the running of the
- batch file and its messages up
- until the CTTY COM1 command.
- Every thing will then freeze up
- until the phone rings, the modem
- answers and sends the DOS prompt
- A> to the remote terminal. As
- with the direct connection, the
- remote can run most DOS commands,
- including ERASE *.* and FORMAT,
- so be careful. To return control
- to the host IBM PC again, type
- CTTY CON from the remote. I hope
- you have as much fun with this
- command as I have had.