Paradyne 3800 manual of DTE Interface Configuration Options

COMSPHERE 3800 Series Modems

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.

9-12 September 1998 3810-A2-GB30-30