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Page 36

Serial Interface RS422

optoNCDT 1402

Data Protocol ILD14018.2

Setup of the Commands 8.2.1

The commands for the sensor are transmitted in full duplex mode. Each instruction has a head, the ID, the

command, the quantity and data if required (parameter, if quantity > 0).

The head contains 4 bytes to identify a connection towards the sensor. The ID consists of 2 bytes, the com-

mand and quantity) consists of 1 byte. The complete string (without parameter) has a length of 8 bytes. The

quantity is a equivalent of the subsequent bytes.

Each complete command is returned by the sensor. The answer contains the 2 ID bytes (equivalent to the

transmitted ID), the modified command byte, the quantity and response informations. The modified com-

mand byte = command OR masked with 0x80

hex

if the command was transmitted successful. If an error hap-

pens the modified command byte = command OR masked with 0xC0

hex

. In the case of an error the quantity

is 1 and contains the error code.

Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8 Byte 9

Head ID Command Quantity Parameter

Set-up of a command in the transmitterFig. 17:

Byte 1 Byte 2 Byte 3 Byte 4 Byte 5

ID Command OR masked with 0x80 hex Quantity Parameter

Set-up of a command in the receiver, error-free transmittedFig. 18:

Byte 1 Byte 2 Byte 3 Byte 4 Byte 5

ID Command OR masked with 0xC0 hex Quantity = 1 Error code

Set-up of a command in the receiver, faulty transmissionFig. 19:

MICRO-EPSILON ILD1402-5 User Manual

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