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Kramer Protocol

Table 4: Protocol Definitions

MSB LSB

DESTI-

NATION

INSTRUCTION

1st byte

INPUT

2nd byte

OUTPUT

3rd byte

MACHINE NUMBER

1 OVR X M4 M3 M2 M1 M0

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.

Used to address machines in a system via their

machine numbers.

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.

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.

Table 5: Instruction Codes for Protocol 2000

Note: All values in the table are decimal, unless otherwise stated.

INSTRUCTION DEFINITION FOR SPECIFIC INSTRUCTION NOTE

# DESCRIPTION INPUT OUTPUT

RESET DEVICE

SWITCH RELAY DATA

Set equal to control data

input which is to be switched

0=OFF

1=ON

Set equal to control data

output which is to be

switched

2,27

45 REQUEST STATUS OF RELAY

DATA OUTPUT

Equal to output number

whose status is reqd

3,4,27

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22 23

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