Kramer Electronics VS-42H user manual Kramer Protocol, Protocol Definitions

Kramer Protocol 2000

10 Kramer Protocol 2000

The VS-42His compatible with Kramer’s Protocol 20001 (version 0.50) (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 5: Protocol Definitions

MSB										LSB
		DESTNATION				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
1st 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).

2nd 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.

3rd 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.

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.

1 You can download our user-friendly “Software for Calculating Hex Codes for Protocol 2000” from our Web site:

http://www.kramerelectronics.com

18 KRAMER: SIMPLE CREATIVE TECHNOLOGY