10
When the bit 0 of CD15 is on, telephone numbers are output at RS232C interface.
3.5.4 How to read and write CD15 Control Register
The CD15 Control Register is written by the following command:
M4B(n1)(n2), where n1 and n2 forms a 8-bit bytes. When it is written, CD15 sends "C" to signal
that it has been written into the non-volatile memory.
For example, for the Bellcore format and raw data format with control characters, the
written command is M4B04. When ETS standard and raw data format is required, the written
command is M4B00.
The CD15 Control Register is read by the following command:
R4B
3.5.5 Input signal attenuation CD15 Control Register bit 4
It is recommended to attenuate caller-ID signal by setting CD15 Control Register bit4 for
general operation. For weak caller-ID signal, CD15 Control Register bit 4 may be set.
3.5.6 OFF-HOOK CONTROL, CD15 CONTROL REGISTER BIT 3, OHTIMEREG, and WAITREG
When the bit 3 of CD15 control register is on, off-hook relay is turned on to establish off-hook
state to answer incoming ring signal. The duration of the off-hook relay is determined by
programming OHTIMEREG as follows:
M54(n1)(n2) where n1 n2 forms two digits hexadecimal number with increment of 100 ms. For
example, M541D would programs three seconds period.
The above sequence of turning on relay is delayed by WAITREG as follows:
M53(n1)(n2) where n1 n2 forms two digit hexadecimal number with increment of 100 ms. For
example M530A would programs one second delay.
The recommended programming sequence is as follows:
M4B18
M530A
M541D
3.6 CD15 Interface Register
CD15 Interface Register also resides in CD15, and it provides selection of RS232C interface
handshake method. Software handshake using XON and XOFF is enabled all the time. The
written command is M3D(n1)(n2), and read command is R3D. A character "C" is output
when write operation into CD15 non-volatile memory is complete.
3.6.1 Hardware handshake (RTS and CTS)
When all bits in CD15 Interface Register are off, hardware handshake method is selected.
The written command is M3D00. It sends "C" after writing into non-volatile memory.
3.6.2 No hardware handshake method
Summary of Contents for CD 15
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