Maxim Integrated 73M2901CE AT Command - Manual (Page 28)

73M2901CE AT Command User Guide UG_2901CE_027
28 Rev. 2.0
4.4.23 S22 – Bit Mapped Register
(Default = 36h)
Register S22 reflects the status of certain options. Register S22 is a bit mapped register whose bits are
defined as follows:
Bit 2 Bit 1 Bit 0 Function: Synchronous/Asynchronous Control
0 0 0 Y0 Asynchronous Mode
0 0 1 Y1 Synchronous Mode
1 0 0 Y4 Quasi-Synchronous Mode
1 1 0 Y6 Asynchronous with speed buffering (Default)
Bit 6 Bit 5 Bit 4 Bit 3 Function: Select Result Code Set
0 0 0 1 X0 Enable Result Codes 0-4.
0 0 0 0 X1 Enable Result Codes 0-5, 10.
0 0 1 0 X2 Enable Result Codes 0-6, 10.
0 1 0 0 X3 Enable Result Codes 0-5, 7, 10.
0 1 1 0 X4 Enable Result Codes 0-7, 10. (Default)
1 0 0 0 X5 Enable Result Codes 0-5, 10, and detect BUSY at OFF HOOK.
1 0 1 0 X6 Enable Result Codes 0-6, 10, and detect BUSY at OFF HOOK.
1 1 0 0 X7 Enable Result Codes 0-5, 7, 10, and detect BUSY at OFF HOOK.
1 1 1 0 X8 Enable Result Codes 0-7, 10, and detect BUSY at OFF HOOK.
Result Code 0 = OK
Result Code 1 = CONNECT
Result Code 2 = RING
Result Code 3 = NO CARRIER
Result Code 4 = ERROR
Result Code 5 = CONNECT 1200
Result Code 6 = NO DIALTONE
Result Code 7 = BUSY
Result Code 8 = NO ANSWER (if @ dial modifier is used and quiet answer is not detected within S7)
Result Code 9 = CONNECT 0600
Result Code 10 = CONNECT 2400
Result Code 11 = CONNECT 4800
Result Code 12 = CONNECT 9600
Result Code 13 = CONNECT 7200
Result Code 14 = LINE-IN-USE
Result Code 22 = CONNECT 75/1200
Result Code 23 = CONNECT 1200/75
bit 7 0 = Pulse dialing make/break ratio = 39/61 (U.S.) (Default).
1 = Pulse dialing make/break ratio = 33/67 (U.K., Hong Kong).
This bit has an effect only when S32 or S33 are set to zero.
4.4.24 S23 – Busy Detect Cadence Count
(Default = 3)
Defines how many busy cadence cycles before sending the busy result code.