Technical Reference

Register

Default

Function

 

 

S19

0

Sets the duration, in minutes, for the inactivity timer. The

 

 

timer activates when there is no data activity on the phone

 

 

line; at time-out the modem hangs up. S19 = 0 disables

 

 

the timer.

 

 

S20

0

Reserved

 

 

S21

10

Sets the length, in 10-millisecond units, of breaks sent

 

 

from the modem to the computer; applies to MNP or

 

 

V.42 mode only.

 

 

S22

17

Stores the ASCII decimal code for the XON character.

S23

19

Stores the ASCII decimal code for the XOFF character.

S24

0

Reserved

 

 

S25

20

Sets the duration, in hundredths of a second, that DTR

 

 

must be dropped so that the modem does not interpret a

 

 

random glitch as a DTR loss. (Most users will want to use

 

 

the default; this register is useful for setting compatibility

 

 

with older systems running under older operating software.)

S26

0

Reserved

 

 

S27

0

Bit-mapped register setup. To set the register,

 

 

see instructions for S13.

 

 

Bit

Value

Result

 

 

0

1

Enables ITU-T V.21 modulation at 300

 

 

 

 

bps for overseas calls; in V.21 mode,

 

 

 

 

the modem answers both overseas

 

 

 

 

and domestic (U.S. and Canada)

 

 

 

 

calls, but only originates V.21 calls.

 

 

 

 

(Default Bell 103)

 

 

1

2

Enables unencoded (non-trellis

 

 

 

 

coded) modulation in V.32 mode.

68 56K Voice Faxmodem Internal - User’s Guide

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3Com 1.024.1644-00 manual Timer