11 kramer protocol 2000, Kramer protocol 2000 – Kramer Electronics VS-88FO User Manual
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VS-88FO - Kramer Protocol 2000
11
Kramer Protocol 2000
The VS-88FO
is compatible with Kramer’s Protocol 2000, version 0.50. This
RS-232/RS-485 communication protocol uses four bytes of information as defined
below. The default data rate is 9600 baud, with no parity, 8 data bits, and 1 stop
bit.
MSB
LSB
DESTI-
NATION
INSTRUCTION
0
D
N5
N4
N3
N2
N1
N0
7
6
5
4
3
2
1
0
1st byte
INPUT
1
I6
I5
I4
I3
I2
I1
I0
7
6
5
4
3
2
1
0
2nd byte
OUTPUT
1
O6
O5
O4
O3
O2
O1
O0
7
6
5
4
3
2
1
0
3rd byte
MACHINE NUMBER
1
OVR
X
M4
M3
M2
M1
M0
7
6
5
4
3
2
1
0
4th byte
1
st
BYTE:
Bit 7
– Defined as 0. D – “DESTINATION”:
0 - for sending information to the switchers (from the PC);
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 using 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).
2
nd
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 using
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.
3
rd
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 using
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.
4
th
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 using 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 using
the serial port, always set M4…M0 = 1, and make sure that the machine
itself is configured as MACHINE NUMBER = 1.
Note: All values in the table are decimal, unless otherwise stated.