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Instruction class - indicates the type of command, e.g., interindustry or proprietary INS 1 Instruction code - indicates the specific command, e.g., "select", "write data" P1-P2 2 Instruction parameters for the command, e.g., offset into file at which to write the data L c: 0, 1 or 3 Encodes the number (N c) of bytes of command data to follow
A terminal node controller (TNC) is a device used by amateur radio operators to participate in AX.25 packet radio networks. It is similar in function to the Packet Assembler/Disassemblers used on X.25 networks, with the addition of a modem to convert baseband digital signals to audio tones. [1]
The command syntax shows some characters in a mixture of upper and lower case. Abbreviating the command to only sending the upper case has the same meaning as sending the upper and lower case command. [3] For example, the command “SYSTem:COMMunicate:SERial:BAUD 2400” would set an RS-232 serial communications interface to 2400 bit/s.
Like other sub-functions in this list, there are manufacturer-specific reserved values that offer unique and/or specific functionality. 0x27 0x67 Security Access Security check is available to enable the most security-critical services. For this purpose a "Seed" is generated and sent to the client by the control unit.
The command bytes are shown here in Hex, but are sent as bytes, not hex strings. In all cases except the Return command, the high nibble indicates which port (on a multi-port TNC) the command applies to. A TNC may support other nonstandard commands, at the vendor's discretion.
Battery Integration and Radar DIsplay Equipment (BIRDIE) Nike missile Command, control and coordination system (CCCS) The Martin Company: AN/GSG-10: TACFIRE Gun data computer automating selected field artillery command and control functions [135]
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Packet Tracer is a cross-platform visual simulation tool designed by Cisco Systems that allows users to create network topologies and imitate modern computer networks.The software allows users to simulate the configuration of Cisco routers and switches using a simulated command line interface.