The Address Byte - Ladybug LB5900 Series Interface Manual

The Address byte

All instructions and queries from the user controller begin with an address byte which
determines the sensor to be accessed. The address byte is the first byte sent after a start
condition is issued and is read by all connected sensors. Message content after the address is
ignored by sensors without matching addresses. LadyBug utilizes I2C standard 7-bit addressing
with bits 7-3 set as '10011' followed by two bits for sensor addressing then the direction bit as
detailed below. Like all transferred bytes to the sensor, the address byte will be acknowledged.
Figure 8 - Sensor Addressing
For hardware selection of Adr1 & Adr2, review the I2C Device Address table in the Electrical
Connection and Addressing section. A Command Header and three data length bytes, follow the
address byte on outbound communications.
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