12 Kramer Protocol 2000
The Kramer Protocol
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| DESTINATION |
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| INSTRUCTION |
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| 0 | D |
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| N5 |
| N4 | N3 | N2 | N1 | N0 |
| 7 | 6 |
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| 5 |
| 4 | 3 | 2 | 1 | 0 |
| 1st byte |
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| INPUT |
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| 1 | I6 |
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| I5 |
| I4 | I3 | I2 | I1 | I0 |
| 7 | 6 |
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| 5 |
| 4 | 3 | 2 | 1 | 0 |
| 2nd byte |
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| OUTPUT |
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| 1 | O6 |
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| O5 |
| O4 | O3 | O2 | O1 | O0 |
| 7 | 6 |
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| 5 |
| 4 | 3 | 2 | 1 | 0 |
| 3rd byte |
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| MACHINE NUMBER |
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| 1 | OVR |
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| M4 | M3 | M2 | M1 | M0 |
| 7 | 6 |
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| 5 |
| 4 | 3 | 2 | 1 | 0 |
| 4th byte |
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1st BYTE: | Bit 7 – Defined as 0. |
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D – “DESTINATION”: | 0 - for sending information to the switchers (from the PC); |
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1 - for sending to the PC (from the switcher). |
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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
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
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 accept (implement) the command, and the addressed machine replies. 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.
i | All the values in the table are decimal, unless otherwise stated |
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