Specifications

AN93
Rev. 0.9 113
The SAS tone varies between countries and requires
configuration of the user registers, U9F–UA9. The
SAS_FREQ (U9F) register sets the expected SAS tone
frequency as shown in Table 81. The default SAS
frequency is 440 Hz. The expected cadence is set in the
ten cadence registers, SAS_CADENCE0 (UA0) through
SAS_CADENCE9 (UA9).
The even-numbered registers, (UA0, UA2, etc.), control
the time that the tone is expected to be present, and the
odd numbered registers select the time that the tone
must not be present. The values are expressed in
10 millisecond units. For example, a cadence of on
500 ms, off 300 ms then on for 500 ms may be selected
by writing 0032h to UA0, 001Eh to UA1 and 0032h to
UA2. The unused registers should be written to 0. The
default cadence setting is UA0 equal to 001Eh, and the
remaining nine registers are set to zero.
Table 80. MDMF Parameters
Character Description Hex Value ASCII Value
Message Type (MDMF) 80
Message Length 20
Parameter Type (Date/Time) 01
Parameter Length 08
Month 30 39 09
Day 31 31 11
Hour 31 36 16
Minutes 32 31 21
Parameter Type (Number) 02
Parameter Length 0A
Number 35 31 32 35 35 35 31 32 33 34 5125551234
Parameter Type (Name) 07
Parameter Length 08
Name 4A 4F 48 4E 5F 44 4F 45 JOHN_DOE
Checksum 40
Table 81. SAS Tone Frequency
SAS_FREQ (U9F) SAS Frequency
0x0000 440 Hz (Default)
0x0001 400 Hz
0x0002 420 Hz
0x0003 425 Hz
0x0004 480 Hz
0x0005 450 Hz
0x0006 900 Hz
0x0007 950 Hz
0x0008 523 Hz
0x0009 1400 Hz