Z02205 datasheet(21/30 Pages) ZILOG

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Z02205

ZiLOG

Modem Controller

PS001000-MOD0599

S21

Reserved

S22

Reserved

S23

Reserved

S24

Reserved

S25

0–255

seconds

or 1/100 sec.

During synchronous operation with the &Q1 command in effect, S-register S25 indicates

the number of seconds after a telephone line connection is made before the modem

examines DTR. This register allows sufficient time to disconnect the modem from an

asynchronous terminal and attach it to a synchronous terminal. In the On-Line or

Command state during any mode of operation, changes in DTR for less than S25

hundredths of a second are ignored.

S26

Reserved

S27

Reserved

S28

0–255

minutes

Terminal inactivity timeout. Hangs up the modem after S28 minutes if no characters are

received from the modem’s terminal. Default = 0

S29

0–255

1/50th sec

Hook Flash On-Hook time. The amount of time in 20 millisecond units the modem will

leave the telephone on-hook while performing a hook-flash according to the “!” dial

string modifier. Default = 25 fiftieths of a second.

S37

0–6

code

Sets the Highest Line Rate. This register determines the highest telephone line data rate

the modem will use when connecting with a remote modem. See “Setting the Highest

Line Rate” section on the following page. Default = 0.

Table 4. Modem S-Registers (Continued)

Range

Units

Description

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