Kramer Electronics VM-28H - Manual (Page 20)

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Communication Protocol
18
8 Communication Protocol
The VM-28H/VM-216H is compatible with Kramer’s Protocol 2000 (version
0.48) (below). This RS-232/RS-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.
Table 4: Protocol Definitions
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 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).
2
nd BYTE: Bit 7 – Defined as 1.
I6…I0 – “INPUT”.
When switching (ie. 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.
3
rd BYTE: Bit 7 – Defined as 1.
O6…O0 – “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 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 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.