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15 Control Protocols

The following section describes the control protocol employed on the

RS232 link for controlling the SOLO transmitters and receiver

equipment.

Connection details are detailed in previous sections.

Note that only features that are licensed for use in the SOLO units can be controlled. The

protocols listed here cover all possible features. Attempting to activate an unlicensed

feature will simply result in the command being ignored by the SOLO unit.

15.1 RS232 Control – General Principles

The physical interface is RS232 but this can be converted to RS 485

with an external adapter where multiple units are controlled over one RS

485 bus.

Normal operation involves sending a packet from the control device

(normally a PC) to the device being controlled. If the packet satisfies an

address integrity check, then the controlled device will action the

command and send a reply.

For compatibility

with modems an ASCII style protocol is used.

Ports are set for 8 bits, No parity, 1 stop

15.2 Packet Structure Sending (from PC)

ASCII Value

STX 02h Start byte

0-9 30h-39h 4 byte unit address. In range 0-9999

R 20h-7Eh 1 byte command type. r read, w write or

m misc

I 20h-7E 1 byte indicator of internal data block

ABC 20h-7Eh Command –three byte mnemonic

; 3Bh Separator

PQR 20h-7Eh Data –Optional, variable length

; 3Bh Separator

X 20h-7Eh Sum Check

ETX 03h End byte

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COBHAM SOLO4 Spezifikationen Seite 86