5-2 RS-232C Kommandotabell

Kommunikasjonsformat (samsvarer med RS232C-standarden)

Baudfrekvens: 9.600 bps

paritet: Ingen

Databit: 8, stoppbit: 1

Flytkontroll: Ingen

Seriell kommunikasjonsprotokoll

1.Kommandopakkestruktur [7 byte]

0x08

0x22

cmd1

cmd2

cmd3

verdi

CS

En kommandopakke består av totalt 7 byte.

De to bytene 0x08 og 0x22 angir at pakken er for seriell kommunikasjon.

De følgende 4 bytene representerer en forhåndsdefinert kommando som kan defineres av brukeren.

Den siste byten er kontrollsummen som kontrollerer gyldigheten for gjeldende pakke.

Topptekst [2 byte]: Forhåndsdefinerte verdier fastsatt til 0x08 ogg 0x22.

Kmd1 [1 byte]: Den første verdien for koden som er definert i kommandolisten (heksidesimal)

Kmd2 [1 byte]: Den andre verdien for koden som er definert i kommandolisten (heksidesimal)

Kmd3 [1 byte]: Den tredje verdien for koden som er definert i kommandolisten (heksidesimal)

Verdi [1 byte]: Inndataparameter for kommandoen (standard: 0) (heksadesimal)

CS [1 byte]: Kontrollsum (2-tallene utfyller summen av alle verdiene unntatt CS-verdien.)

2.Responspakkestruktur [3 byte] 1. Vellykket

0x03

0x0C

0xF1

 

 

 

2.Mislykket

0x030x0C0xFF

Når den mottatte pakken fra en ekstern enhet har en gyldig verdi, sendes en vellykket pakke. Ellers sendes en mislykket pakke.

En mislykket pakke sendes hvis:

Den mottatte pakkelisten ikke er lik 7 byte.

Verdien på pakkeoverskriften på 2 byte ikke er lik 0x08, 0x22.

Kontrollsummen er feil.

Mislykket registrering av en ekstern enhet

En ekstern enhet klassifiserer pakken som mislykket hvis den ikke mottar en vellykket pakke innen 100 ms.

5-2

Mer informasjon

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Samsung SP2203XWX/EN, SP2503XWX/EN manual RS-232C Kommandotabell, Kommunikasjonsformat samsvarer med RS232C-standarden

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