Multi-Tech Systems MTSGSM - Manual (Page 44)

MultiMobile SoftGSM User Guide
MTSGSM 44
S21 Configuration bitmap
Description S21 is a bitmapped register and controls a wide range of modem properties.
Bit Default Meaning
0 0 Not used, implemented for compatibility reasons. Corresponds to AT&J.
1 N.A. Not used
2 1 RTS/CTS behavior.
A value of 0 means CTS always on and corresponds to AT&R0.
A value of 1 means that CTS tracks RTS and corresponds to AT&R1 .
3, 4 2 Result codes behavior.
A value of 0 means that the modem ignores DTR and corresponds to
AT&D0.
A value of 2 means that the modem disconnects and returns OK on loss of
DTR and corresponds to AT&D2 .
5 1 DCD behavior.
A value of 0 means that DCD is always active and corresponds to AT&C0.
A value of 1 means that DCD reflects true carrier status and corresponds to
AT&C1.
6 0 DSR behavior.
A value of 0 means that DSR is always active and corresponds to AT&S0 .
A value of 1 means that DSR is active when handshake begins and
corresponds to AT&S1 .
7 N.A. Not used
S22 Configuration bitmap
Description S22 is a bitmapped register and controls a wide range of modem properties.
Bit Default Meaning
0 N.A. Not used
1 N.A. Not used
2 N.A. Not used
3 N.A. Not used
4.5,6 7 Limit result codes.
A value of 0 corresponds to ATX0
A value of 4 corresponds to ATX1
A value of 5 corresponds to ATX2
A value of 6 corresponds to ATX3
A value of 7 corresponds to ATX4 (default)
(See ATX description of these settings.)
7 N.A. Not used
S30 Inactivity timer
Description S30 specifies the maximum time that a data connection will be maintained if no data
transfer occurs. The value is in tens of seconds.
Value Meaning
0 The inactivity timeout is disabled. This is the default value.
1-255 The maximum time to maintain a connection without any data transfer.