Table 18: S registers
Register
Function
S42
Auto rate (for test and debugging only)
0
Disabled
1
Enabled
S43
Auto mode (for test and debugging only)
0
Disabled
1
Enabled
S89
Timer to control sleep mode
176
Appendix C: Modem information
Range / units
0, 5-255 / seconds
Default
1
1
10