Using XFER
Advanced User’s Guide
3-19
Xmodem:
If the
F
option is not included in the command line, no flow
control is used. XON/XOFF cannot be used with Xmodem protocol, because
Xmodem protocol sends raw binary data and cannot distinguish between the
XON/XOFF characters and file data. Attempting to specify XON/XOFF with
Xmodem protocol will result in an error.
Zmodem:
On the Falcon
33x
and
34x
, the default flow control for Zmodem
is Xon/Xoff. For all other portables and host PCs, the default is RTS/CTS. On
a Falcon portable, flow control should be used when transferring with
Zmodem, especially if Zmodem is in streaming mode. In streaming mode, the
Zmodem sender does not wait for acknowledgements to packets but
continuously sends a stream of data. Often this can overwhelm the receiver
especially if it is receiving at high data rates or receiving to the
C
drive or to a
PCMCIA ATA card, which writes data to disk much slower than the
D
drive.
H or ?
Help:
This option displays a brief description of the XFER syntax, options, and
settings.
I
file
Modem-Initialization File:
This option specifies the file that contains modem
setup and control commands. Refer to
on
for complete information about I
file
.
M
command
Modem Command:
This option allows commands to be sent to the modem
before the start of the file transfer. To use the
M
option, replace
command
with
one of the following commands:
A
= Auto answer
ATstr
= Send AT
str
commands
D#x
= Dial memory #
x
(0–9)
Dstr
= Dial phone number
str
Specifying
XFER
/MA
instructs the modem to go into auto-answer mode. In
this mode the modem will wait for the timeout period specified in the modem-
initialization file for another modem to dial into it. On detection of a ring-in
signal, XFER will answer the line and attempt to start a file transfer.
Specifying
XFER
/MATstr
allows a string of AT commands to be sent to the
modem. These commands will be sent to the modem after the initialization
string from the modem-initialization file and can be used to specify a different
configuration. Since only one modem command can be specified on the
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