COBHAM SOLO4 Especificações descarregar pdf (Página 87)

15.3 Packet Structure Reply (from controlled device)

ASCII Value

STX 02h Start byte

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

Z 20h-7Eh Status BYTE

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

; 3Bh Separator

X 20h-7Eh Sum Check

ETX 03h End byte

The Sum check byte is the summation of all bytes in the packet, not

including the start and end bytes. Higher order bytes are ignored and

the final byte result is modified to prevent ASCII control characters being

sent. Bit 7 (highest) is forced high.

Status byte will indicate command performed OK, or indicate an error.

ASCII Meaning

1 All OK

E General error, Command could not be actioned

Typically E will be returned if the message is formatted incorrectly

(separators in wrong place) or if commands are in upper case, or if

commands do not match against the allowed list of commands, or if the

checksum is wrong.

Addresses in the range 0001 to 9998 are for general use. Address 0000

is reserved and 9999 is a broadcast address. i.e. any device will reply to

this address. Its reply will contain its own specific address.

All data in the transmitter and receiver is stored as one of 5 data types,

Double, String, List, Integer or HexInteger. The data type dictates the

contents of the data section of the reply.

• List – 1 byte for sending. Value is hexadecimal coded as ASCII. 2 byte

reply. Reply represents index into original choice list. e.g. Reply 02

indicates entry 2 in original list.

• Double - variable length. Reply always contains decimal point and 4

decimal places. Can have 1 to 3 digits before decimal.

• Integer - 6byte reply. integer value with stuffed with preceding zeros.

e.g. GOP reply 000012 = GOP length 12

• String - Variable length. Reply is string excluding null terminator

• HexInteger – 8byte Hex reply

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 98 99

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COBHAM SOLO4 Especificações Página 87