Black Box 3600 MODEM manual Changing S-Register Values

Status Registers

Bit values for S-registers must not be confused with the total register value. Bit values are counted separately for each option group, called bit mapping, while the register value is the cumulative decimal or hexadecimal total. The decimal value counts all eight bits as a single group. Hexadecimal values split the bits into two groups of four each. Writing to an S-register changes the total value. Figure 10-2 shows the difference between decimal calculation and hexadecimal calculation.

Figure 10-1. Changing S-Register Values

Figure 10-2. Calculating S-Register Values

10-2 Modem 3600