Chapter 6: Serial Control
(Special) characters:
ACK 0x06
NAK 0x15
STX 0x02
ETX 0x03
CR 0x0D
ESC 0x1B
HTAB 0x09
LF 0x0A
Sequence of a Data Communication
Table 6-1. Data communication sequence.
ServSwitch KVM DKM FX | Control CPU | |
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— | 1. Send a command | |
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2. Acquire a command, process a | — | |
command, block further commands. | ||
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3. a) Errors occurred: <NAK> |
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b) No errors: <ACK><ECHO> | — | |
c) Optional: Reply telegram with data |
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| 4. a) Repeat telegram | |
— | b) Next command | |
| c) Receive and process the repeat telegram | |
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NOTE: The serial interface can be blocked while OSD is open.
Switching Functions Telegrams
Table 6-2. Input port’s request for output port.
Bytes | Description | Coding | |
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1 | Control character | 0x1B | |
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1 | Server indentification | 0x5B | |
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1 | Command | 0x42 | |
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2 | Total length of telegram (7 bytes, binary) | 0x07 0x00 | |
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2 | Requested output port (binary, 1…max. ports) | 0x01 0x00 (for port 1) to 0x120 0x00 (for port | |
288) | |||
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Page 109 |
