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Digital Interfaces RS422
optoNCDT 1420
8.
Digital Interfaces RS422
8.1
Preliminary Remarks
The interface RS422 has a maximum baud rate of 1 MBaud. The factory-set baud rate is 921.6 kBaud. The
maximum measuring rate is 4 kHz.
Data format: Measurement values in binary format, commands as an ASCII string.
Interface parameter: 8 Data bits, no parity, one stop bit (8N1).
i
Disconnect or connect the D-sub connection between RS422 and USB converter when the sensor is
disconnected from power supply only.
8.2
Measurement Data Format
16
1
resp. 18 bits are transmitted per output value, see Chap.
. An output value is divided into three bytes
that differ in the two most significant bits. The transmission of additional output values is optional.
Output value 1 / additional:
L-Byte
0
0
D5
D4
D3
D2
D1
D0
M-Byte
0
1
D11
D10
D9
D8
D7
D6
H-Byte
1
0
2
0
3
0
3
D15
D14
D13
D12
Output sequence: L-Byte, M-Byte, H-Byte.
1, 3) Error values are coded with 18 Bit.
2) To decide between the 1
st
output value and additional output values, bit 7 in the H-Byte is set to 1. Bit 7 in
the H-Byte is set to 0 for the 1
st
output value. This simultaneously represents the identifier of a new block. De-
pending on the measuring rate, baud rate and output data rate output all data can be output in one block. If
data output is not possible, a run-time error will be output. Use the command GETOUTINFO_RS422 to query
for data selection and output sequence.
Содержание ILD 1420-10
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