15
4lliBYTE: Bit 7 - Defined as I.
Bit 5 - Don't care.
OVR - Machine number override.
M4 ... MO - MACHINE NUMBER
Used to address machines in a system via their machine nwnbers. When several machines are controlled from a single serial
port, they are usually configured together with each machine having an individual machine nwnber. 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... MO
=
1, and make sure that the machine itself is
configured as MACHINE NUMBER ~ I.
Bit 7 - Defined as I.
06 ... 00 - "OUTPUT"
When switching (ie. 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 NU1'v1BERwhich was
switched. For other operations, these bits are defined according to the table.
3ruBYTE:
Bit 7 - Defined as I.
16... 10- "INPUT"
When switching (ie. instruction codes 1 and 2), the
Ilql'Uf
(7 bits) is set as the input mnnber which is to be switched.
Similarly, if switching is done via the machine's front-panel, then these bits are set with the INPUT NU1'v1BERwhich was
switched. For other operations, these bits are defined according to the table.
2odBYTE:
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
rnSTRUCTION
NO., which was performed. The
instruction codes are defined according to the table below (INSTRUCTION NO. is the value to be set for N5 ... NO).
1st byte
I
~6
INPUT
I;
I~
1~4
I~
1~2
1~
1
1~O
2nd byte
I
~6
OUTPUT
I;
1~5 1~4 1~3 1~2 1~1 1~O
3rd byte
MACHINENUMBER
1 OVR
X
M4 M3 M2 M1 MO
7
6
5 4 3 2 1
0
4th byte
IOBYTE:
Bit 7 - Defined as O.
D - "DESTINATION"
0- for sending information to the switchers (from the PC);
1 - for sending to the PC (from the switcher).
N5 ...NO - "INSTRUCTION"
DESTI-
INSTRUCTION
NATION
10
D N5
IN4
1
N3
1
N2
1
N1
1
NO
7 6
5 4 3 2 1
0
LSBMSB
Table
4:
Protocol Definitions
The VM-24H is compatible with Kramer's Protocol 2000 (version 0.50)
(below). This RS-232IRS-485 communication protocol uses four bytes of
information as defined below. For RS-232, a null-modem connection
between the machine and controller is used. The default data rate is 9600
baud, with no parity, 8 data bits and 1 stop bit.
8 Communication Protocol
Communication Protocol
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