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COMSPHERE 3800 Series Modems
9-12 November 1996 3810-A2-GB30-20
Table 9-1
(5 of 7)
DTE Interface Configuration Options
CTS Control: Forced_On
Nxt Forced_On Stndrd_RS232 WinkWhenDisc Follows_DTR
Clear-to-Send Control. CTS is a signal from the modem to the DTE indicating that it can accept data from the DTE.
NOTE:
When CTS flow control or CTS/RTS flow control is enabled, CTS will turn ON and Off regardless of the setting
of CTS Control.
Forced On – CTS is forced ON at all times. Use this selection for most asynchronous applications.
Standard RS232 – In Synchronous mode, forces the state of CTS to follow the state of RTS in normal EIA-232-D
operation. The minimum time that elapses between CTS and RTS is determined by the RTS/CTS Delay configuration
option. Use this setting for most synchronous applications.
In AT Command mode, CTS goes low just prior to DSR going active and goes high when the modem enters Data mode.
This operation prevents losing data in applications which begin transmitting as soon as DSR and CTS are both active.
Wink When Disconnect – CTS is normally forced ON, but is turned Off for 1 to 2 seconds upon a disconnect. Use this
for most UNIX applications.
Follows DTR – The state of CTS follows the state of DTR. When DTR turns ON, CTS turns ON. When DTR turns Off,
CTS turns Off.
For Async Dial, Forced On is the factory default.
For Sync Dial and Sync Leased, Stndrd_RS232 is the factory default. For UNIX Dial, WinkWhenDisc is the factory
default.
AT command for Forced On is \D0.
AT command for Standard RS232 is \D1.
AT command for Wink When Disconnect is \D2.
AT command for Follows DTR is \D3.
RTS/CTS Delay: 0 msec
Nxt 0msec 10msec 50msec 150msec 600msec
Request-to-Send/Clear-to-Send Delay. RTS/CTS Delay sets the delay time between the modem receiving RTS from the
DTE and the modem sending CTS to the DTE.
This delay is only valid in Async Direct mode and synchronous applications when it is necessary to have a short delay
between the time the DTE raises RTS and the time the modem presents CTS to allow the DTE to send data.
NOTE: For this configuration option to be valid, both the RTS Action and the CTS Control configuration options must be
set for Stndrd RS232. If RTS Action is set for Ignore, RTS is always ON and this configuration option has no
effect.
The factory default is 0 milliseconds.
AT command is S-register S26 =
n,
where
n
is a value from 0 to 255 in 10 millisecond increments.