Kramer Electronics VP-88K User Manual download pdf (Page 55)

Kramer Protocol

AFV-MODE = Front panel AFV mode

"0" or "afv" to set front panel switching buttons in audio-follow-video state.

"1" or "brk" to set front panel switching buttons in their previous state when audio.

15.3 Kramer Protocol 2000

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 18: Protocol Definitions

MSB

LSB

DESTI-

NATION

INSTRUCTION

0 D N5 N4 N3 N2 N1 N0

1st byte

INPUT

7 6 5 4 3 2 1 0

2nd byte

OUTPUT

7 6 5 4 3 2 1 0

3rd byte

MACHINE NUMBER

OVR

4th byte

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).

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.

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.

BYTE: Bit 7 – Defined as 1.

Bit 5 – Don’t care.

OVR – Machine number override.

M4…M0 – MACHINE NUMBER.

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Kramer Electronics VP-88K User Manual Page 55

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