Status Registers

DTR State Recognition S25

The S25 register specifies the amount of time (0-255) in 0.01 second (10 ms) increments that DTR must stay high or low in order to be recognized as such. The default value is 5 (0.05 second).

RTS/CTS Delay S26

The S26 register specifies the amount of time (0-255) in 0.01 second (10 ms) increments between the RTS signal and the CTS signal. The default value is 0.

Bit Mapped

S27

 

 

 

 

 

Bit

Value

Command

Description

 

 

 

 

1, 0

00

&M

Async

 

01

&M1

Sync data / async dial

 

10

&M2

Sync data / dial through DTR

 

11

&M3

Sync data / manual dial

 

 

 

 

2

0

&L

Dial-up line

 

1

&L1 and

Leased line

 

 

&L2

 

 

 

 

 

3

--

--

Reserved

 

 

 

 

5, 4

00

&X

Internal clock

 

01

&X1

External clock

 

10

&X2

Receive clock

 

11

--

Not used

 

 

 

 

6

1

--

Enable async DTR dialer

 

0

 

Disable async DTR dialer

 

 

 

 

7

--

--

Reserved

 

 

 

 

Lookback Timer S28

The S28 register specifies the amount of time in 1.0 minute increments that the modem will remain in dial backup mode before retrying leased line mode. A zero will disable automatic lookback to leased line. The default value is 15 minutes.

Bit

Value

Command

Description

 

 

 

 

7- 0

0-255

--

Time in 1 minute increments (0=disabled)

 

 

 

 

Modem 3600

10-11

Page 155
Image 155
Black Box 3600 MODEM manual DTR State Recognition S25, RTS/CTS Delay S26, Bit Mapped S27, Lookback Timer S28