A complete list of S-Registers A-7

Register

Default

Function

 

 

 

 

4

16

Disable MNP Level 4; retransmitting

 

 

 

 

the larger Level 4 data blocks may

 

 

 

 

be a problem if you expect a great

 

 

 

 

number of errors during a call.

 

 

5

32

Set Backspace key to delete.

 

 

6

64

Some earlier 2400 bps MNP

 

 

 

 

modems, not made by 3Com or

 

 

 

 

Microcom, were not fully

 

 

 

 

compatible with the MNP protocol.

 

 

 

 

If you have difficulty making a

 

 

 

 

successful 2400 bps MNP

 

 

 

 

connection with a remote MNP

 

 

 

 

modem, it may be because of this

 

 

 

 

incompatibility. Set S15 to 64 and

 

 

 

 

try again to make the connection.

 

 

7

128

Custom applications only.

 

 

 

 

The default 1.5K byte non-ARQ

 

 

 

 

buffer allows data transfer with X-

 

 

 

 

and Y-modem type File Transfer

 

 

 

 

Protocols without using flow

 

 

 

 

control.

 

 

 

 

The 128-byte option allows remote

 

 

 

 

users with slower modems to stop

 

 

 

 

your transmitted data from scrolling

 

 

 

 

off their screens. When remote

 

 

 

 

users send your computer an XOFF

 

 

 

 

(<Ctrl-S>) and you stop

 

 

 

 

transmitting, the data in transit

 

 

 

 

doesn’t exceed the size of their

 

 

 

 

screen.

 

 

 

S16

0

Bit-mapped register. (See the beginning of this appendix for

 

 

information about setting bit-mapped registers). For

 

 

testing, see Chapter 15, Testing.

Bit

Value

Result

1

2

Dial Test

2

4

Test pattern.

3

8

Remote digital loopback.

S18

0

Test timer for software-initiated loopback testing (&Tn);

 

 

disabled when S18 is set to 0. Used to set the duration of

 

 

testing, in seconds, before the Business Modem

 

 

automatically times out and terminates the test.

Page 143
Image 143
3Com 56K manual Larger Level 4 data blocks may, Be a problem if you expect a great, Number of errors during a call, Screen