US Robotics COURIER Manual do Utilizador descarregar pdf (Página 15)

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101

U.S. Robotics I-modem Command Reference

Using the AT Command Set • Page 1-6

Bit-Mapped S-registers

Understanding Bit-Mapped S-registers

Certain registers are "bit-mapped." A bit-mapped register uses one number to describe a

collection of settings. While bit-mapping allows us to pack a lot of information in a small

space, it is complex. Unfortunately, some discussion of binary mathematics is necessary to

explain bit-mapping.

When the I-modem displays the value of an S-register, you see a decimal value between 0

and 255. The I-modem, however, understands the decimal value as a collection of binary

digits (bits). HereÕs how bits are mapped to 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

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 307 308

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