Kramer Electronics VP-14x1 Pin D-sub Serial Port Pinouts, Protocol Command Definition

Serial Port Pinouts

8Serial Port Pinouts

Table 7 describes the pinouts of the 9-pin D-sub serial ports.

Table 7: 9-Pin D-sub Serial Port Pinouts

Pin Function

2Receive

3Transmit

5Ground

Note: Flow control signals are not supported.

9 Table of Hex Codes for Serial Communication (Protocol 2000)

The RS-232/RS-485 Protocol 2000 uses four bytes of information as shown in Table 8. The data rate is set by the DIP-switches (see Table 5), with no parity, 8 data bits and 1 stop bit.

Table 8: Protocol Command Definition

	MSB								LSB
			DESTI-				INSTRUCTION
			NATION
0		D		N5	N4	N3	N2	N1	N0
7	6		5		4	3	2	1	0

1st byte

1

7

2nd byte

1

7

3rd byte

1

7

4th byte

INPUT

I6	I5	I4	I3	I2	I1	I0
6	5	4	3	2	1	0

OUTPUT

O6	O5	O4	O3	O2	O1	O0
6	5	4	3	2	1	0

				MACHINE NUMBER
OVR	X	M4	M3		M2	M1	M0
6	5	4	3		2	1	0

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.

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