42
W&T
Modem Operation
4.4.15 &K (AT&K[0|3|4|5|6])
= Flow control
Default setting: 3 = RTS/CTS
This command determines the flow control between the LAN-
Modem and the connected serial device:
•
&K0
(no handshake)
Flow control is turned off. The LAN-Modem sends all data
to the serial device regardless of the status of the
handshake input RTS. In the opposite direction the LAN-
Modem has no way to report an impending overflow of
its input buffer through the CTS output, so that in this
case the serial applications are responsible for ensuring
data integrity.
•
&K3 (RTS/CTS)
Flow control is handled by the port signals RTS and
CTS. The LAN-Modem sends serial data only when
t h e r e i s a n e n a b l e l e v e l o n i t s R T S i n p u t . A n
impending overflow of the serial input buffer is signaled
by the CTS output.
•
&K4 (Xon/Xoff)
Flow control is handled by the control characters
Xon
(hex 11) and
Xoff
(hex 13), whereby these characters
are filtered out from the user data stream. If the LAN-
Modem receives an
Xoff
, no additional data are sent
to the serial device until the latter has sent an
Xon
.
The LAN-Modem indicates its ready or not-ready status
likewise using an
Xoff
or
Xon
.
•
&K5 (transparent Xon/Xoff)
As in the case of
&K4
the flow control is handled by
Xon/Xoff
. The control characters are now however not
f i l t e r e d o u t , b u t r a t h e r s e n t t r a n s p a r e n t t o t h e
communication partner.
Summary of Contents for 58210
Page 1: ...Release 1 2 March 2002 Model 58210 58220 58610 58620 Manual LAN Modem W T...
Page 6: ...6 W T...
Page 26: ...26 W T...
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Page 62: ...62 W T Appendix Declaration of conformity...
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