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INX***DH-F199-B30-***,INY***DH-F199-B30-***
Product Description
2
Product Description
2.1
Use and Application
INX***DH-F199-B30-*** and INY***DH-F199-B30-*** series inclination sensors detect and
measure the tilt angle (inclination/slope/elevation) of an object in relation to the force of gravity.
The basic principle behind these inclination sensors is a microelectromechanical systems
(MEMS) sensor cell that is embedded in a fully molded application-specific integrated circuit
(ASIC). The angle is measured by the relative change in electrical capacitance in the MEMS
cell.
INX***DH-F199-B30-*** sensors are 1-axis sensors that detect and measure the tilt around the
x-axis.
INY***DH-F199-B30-*** sensors are 2-axis sensors that detect and measure the tilt around the
x-axis and the y-axis.
Communication with the inclination sensors, such as configuration and data output, occurs via
a MODBUS RTU interface.
MODBUS RTU Interface
MODBUS RTU is an open serial (RS-232 or RS-485) protocol that is based on master/slave
architecture. It is a widely accepted protocol due to its ease of use and reliability. MODBUS
RTU messages are simple and, therefore, reliable. Due to this simplicity, the basic 16-bit
MODBUS RTU register structure can be used to pack in floating point, tables, ASCII text,
queues, and other unrelated data.
The MODBUS application protocol defines a simple protocol data unit (PDU) independent of
the underlying communication layers: The mapping of MODBUS protocol on a specific bus or
network introduces some additional fields on the PDU. The client that initiates a MODBUS
transaction builds the MODBUS PDU and then adds fields to build the appropriate
communication PDU.
Address field
Figure 2.1
On the MODBUS serial line, the address field only contains the slave address. The valid slave
node addresses are in the range of 0 ... 247 decimal. The individual slave devices are assigned
addresses in the range of 1 ... 247. A master addresses a slave by placing the slave address in
the address field of the message. When the slave returns its response, it places its own
address in the response address field to let the master know which slave is responding
2.2
Accessories
Various accessories are available. See datasheet or relevant product page on the Internet
www.pepperl-fuchs.com.
MODBUS SERIAL LINE PDU
Function code
Data
MODBUS PDU
CRC (or LRC)
7
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