191 Comms
Note! Modern modems can sense and adjust to the speed at which you are
transmitting. With older modems, you may need to specify the exact speed of
the connection.
Data bits, stop bits and parity
The data bits, stop bits and parity settings determine how each character to be
transmitted is converted into bits.
• Set the number of data bits to the same as the setting on the remote
machine.
• Set the number of stop bits to be the same as the setting on the remote
machine. Usually 1 stop bit is sufficient, but with low Baud rates (300 or
less), or when communicating with some mechanical devices, you may
need to set 2 stop bits. Having 2 stop bits set instead of 1 will never cause
an error (though the transfer rate will be slightly slower). However, setting
1 when you should have 2 will cause errors.
• You can choose from none, even and odd parity. Make sure the setting is
the same as the one on the remote machine.
Handshaking
Use the tick boxes on the Handshaking page of the Communication settings
dialog to select which of the following are used when communicating:
• XON/XOFF
• RTS/CTS
• DSR/DTR
• DCD
When communicating via a modem, you should normally set XON/XOFF,
DSR/DTR and RTS/CTS handshaking, though this may vary according to the
remote setup and your modem manufacturer’s guidelines.
• Handshaking is sometimes termed flow control.
• For Hardware flow control, tick the RTS/CTS box.
The type of Terminal emulation
Comms can emulate a plain ‘teletype’ or a VT100 terminal.
• To use one of these: select Terminal emulation on the Tools menu.
Choose TTY for a teletype, or VT100 in the Terminal to emulate line.
You can adjust the width and height of the screen by setting the number of
characters for each in the Terminal emulation dialog. If you set a greater width
or height than can be displayed in the current zoom state, you can use the
scroll bars to view other areas of the screen.
Note! To hide the scroll bars, remove the tick from Show scroll bars on the
View menu.
• Use Clear screen on the Edit menu to remove all the characters from the
display.
Special codes
Different computers may require different codes to be sent when the Enter key
is pressed. Comms is initially set to add a ‘line feed’ character to both
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