KRAMER: SIMPLE CREATIVE TECHNOLOGY
Communication Protocols
18
1st BYTE:
Bit 7 – Defined as 0.
D – “DESTINATION”: 0 - for sending information to the switchers;
1 - for sending to the PC (from the switcher).
N5…N0 – “INSTRUCTION”
The function that is to be performed by the switcher(s) is defined by the
INSTRUCTION (6 bits). Similarly, if a function is performed via the
machine’s keyboard, then these bits are set with the INSTRUCTION NO.,
which was performed. The instruction codes are defined according to the
table below (INSTRUCTION NO. is the value to be set for N5…N0).
2nd BYTE:
Bit 7 – Defined as 1.
I6…I0 – “INPUT”.
When switching (i.e., instruction codes 1 and 2), the INPUT (7 bits) is set as
the input number which is to be switched. Similarly, if switching is done via
the machine’s front-panel, then these bits are set with the INPUT NUMBER
which was switched. For other operations, these bits are defined according to
the table.
3rd BYTE:
Bit 7 – Defined as 1.
O6…O0 – “OUTPUT”.
When switching (i.e., instruction codes 1 and 2), the OUTPUT (7 bits) is set
as the output number which is to be switched. Similarly, if switching is done
via the machine’s front-panel, then these bits are set with the OUTPUT
NUMBER which was switched. For other operations, these bits are defined
according to the table.
4th BYTE:
Bit 7 – Defined as 1.
Bit 5 – Don’t care.
OVR – Machine number override.
M4…M0 – MACHINE NUMBER.
Used to address machines in a system via their machine numbers. When
several machines are controlled from a single serial port, they are usually
configured together with each machine having an individual machine number.
If the OVR bit is set, then all machine numbers will accept (implement) the
command, and the addressed machine will reply.
For a single machine controlled via the serial port, always set M4…M0 = 1, and
make sure that the machine itself is configured as MACHINE NUMBER = 1.