CHAPTER 6: S-Registers

default setting is two seconds. S8 may be set for up to 255 seconds.

S8 also sets the time the modem waits before retrying a call after detecting a busy signal. Some computer systems need more than two seconds to reset (in which case you should increase the value of S8).

S9

Carrier Detect Response Time

Unit:

100-mSec intervals

Range:

1-255

Default:

6

Description:

S9 sets the time delay between when the modem

 

first detects a valid incoming carrier signal and

 

when the modem turns on its Carrier Detect

 

circuit. The default setting is 600 milliseconds

 

(six units of 100 mSec each). S9 may be set to a

 

maximum of 255 (25.5 seconds).

S10

Carrier Loss Disconnect Delay Time

Unit:

100-mSec intervals

Range:

0-255

Default:

7

Description:

S10 sets the time a carrier signal must be lost

 

before the modem disconnects. The default

 

setting is 700 mSec (seven units of 100 mSec

 

each). Maximum delay is 25.4 seconds (S10 set

 

to 254). Setting the S10 value to 255 causes the

 

modem to not disconnect with loss of carrier.

 

(This S-Register applies at speeds of 2400 bps

 

and less.)

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Black Box MD1640A, MD1641A manual Carrier Detect Response Time, S10 Carrier Loss Disconnect Delay Time