Me inertialSENSOR ACC5703, Руководство по эксплуатации

Страница: 25 / 30

Page 25
Appendix | Digital Interface RS485
ACC5703
A 4.2.1 Reading Measurement Data
Master: Request data
Byte: SD DA SA FC FCS ED
Value: 0x10 x x 0x4C x 0x16
FCS
Slave: Response data
Byte: SD LE LE
rep SD
rep DA SA FC Data[] FCS ED
Value: 0x68 x x 0x68 x x 0x08 x x 0x16
FCS
Designations
SD Start Delimiter
(0x10: datagram without data, 0x68: datagram with variable length)
LE Length (number of bytes without SD, LE, LE rep, SD rep, FCS, ED)
LE rep LE repeated
SD rep SD repeated
DA Destination Address (default 0x7E = 126)
SA Source Address (e. g. 0x01)
FC Function Code
FCS Checksum
(sum of all bytes without SD, LE, LE rep, SD rep, FCS, ED, overflow at 256)
ED End Delimiter
Data[] Measurement data, variable number, little endian
The measurement data consists of one status byte, one measured values counter, number of measured val-
ues, and the measured data. The measured values counter increases continuously with each sampled value.
It represents the number of measured values buffered in the sensor since the last enquiry by the master and
therefore represents the number of the measured values transmitted in this package (floats).