Kramer-electronics VP-14xl User Manual download pdf (Page 11)

Serial Port Pinouts

8 Serial 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

2 Receive

3 Transmit

5 Ground

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-

NATION

INSTRUCTION

1st byte

INPUT

1 I6 I5 I4 I3 I2 I1 I0

2nd byte

OUTPUT

1 O6 O5 O4 O3 O2 O1 O0

3rd byte

MACHINE NUMBER

OVR

7 6 5 4 3 2 1 0

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.

1 2 ... 6 7 8 9 10 11 12 13 14

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Kramer-electronics VP-14xl User Manual Page 11

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