A
S-R
EGISTERS
Understanding
Bit-Mapped
S-Registers
A bit-mapped S-Register uses one number to describe a collection of
settings. Bit-mapping allows us to pack a lot of information in a small
space.
Bit-mapped registers are in the form of Sr.b=n, where r is the bit-mapped
register;.b is the bit; n is 0 (off) or 1 (on).
The modem displays the value of an S-Register, as a decimal value
between 0 and 255. The modem, however, understands the decimal
value as a collection of binary digits (bits).
How bits are
mapped to decimal
values
Bits can be mapped into decimal values. Each bit can be either on (1) or
off (0). Eight bits create 256 unique combinations of 1s and 0s. Each of
the eight bits can be assigned a number corresponding to its position:
b b b b b b b b
7 6 5 4 3 2 1 0
Also, each bit can be assigned a value corresponding to its number:
Bit
Value
7
2
7
=
128
6
2
6
=
64
5
2
5
=
32
4
2
4
=
16
3
2
3
=
8
2
2
2
=
4
1
2
1
=
2
0
2
0
=
1
Summary of Contents for OfficeConnect 56K Business
Page 14: ...4 ABOUT THIS GUIDE ...
Page 32: ...1 18 CHAPTER 1 CONNECTING TO YOUR ISP ...
Page 42: ...3 6 CHAPTER 3 MODES OF OPERATION ...
Page 64: ...7 4 CHAPTER 7 CONTROLLING EIA 232 SIGNALING ...
Page 72: ...8 8 CHAPTER 8 CONTROLLING DATA RATES ...
Page 80: ...9 8 CHAPTER 9 ACCESSING AND CONFIGURING THE BUSINESS MODEM REMOTELY ...
Page 96: ...11 6 CHAPTER 11 FLOW CONTROL ...
Page 108: ...12 12 CHAPTER 12 HANDSHAKING ERROR CONTROL DATA COMPRESSION AND THROUGHPUT ...
Page 112: ...13 4 CHAPTER 13 DISPLAYING QUERYING AND HELP SCREENS ...
Page 124: ...14 12 CHAPTER 14 TESTING THE CONNECTION ...
Page 132: ...15 8 CHAPTER 15 TROUBLESHOOTING ...
Page 162: ...B 14 APPENDIX B ALPHABETIC COMMAND SUMMARY ...
Page 168: ...C 6 APPENDIX C FLOW CONTROL TEMPLATE ...
Page 210: ...14 GLOSSARY ...