Installation guide

Chapter 7: AT Commands and Registers
7-48 CSMIM-T1 Hardware Installation Guide
S21= n Bit Mapped Register (Table 7-10)
Table 7-10 Saved Command Settings with S21
S22= n Bit Mapped Register (Table 7-11)
Table 7-11 Saved Command Settings with S22
Bit
Position
Function Decimal Value
3,4 DTR 0 Ignores DTR (&D0)
1 On-to-Off DTR transition: modem enters com-
mand state (&D1)
2 On-to-Off DTR transition: modem goes on
hook (&D2)
3 On-to-Off DTR transition: modem resets
(&D3)
5 DCD 0 DCD always On
1 DCD On indicates data carrier is present or
DCD On except momentarily at disconnect
6 not used
7 long space 0 off (Y0)
disconnect 1 on (Y1)
Bit
Position
Function Decimal Value
4,5,6 result code 0 same as X0
options 4 same as X1
5 same as X2
6 same as X3
7 same as X4
7 make/break 0 39/61
ratio 1 33/67