Datasheet

36
D6F-D MEMS 2-Axis Flow Sensor
Connection
Fig. 2. Block Diagram
The sensor has two port of RJ-45 connectors (8 pins), and all the pair of each pin is connected internally.
These connectors can be used for daisy chain wiring when using multiple devices on the same bus (multi-drop connection).
The standard CAT5e straight LAN cable can be used for the electrical connection.
Interface
* The communication settings of this device can be set by DIP switch configuration as shown in Fig. 3.
All bits are switched off before shipment.
Fig. 3. DIP Switches
Item Specifications
Interface RS-485
Wire Connection Multi-drop connection with daisy chain wiring (32 devices max.)
Communication system 2 wires : Half duplex
Baud rate 9600bps or 38400bps : DIP switch* selectable
Protocol Modbus-RTU
Transmission code Binary
Data length 8 bit
Stop bit 1 bit
Parity None
Response time 250 ms max.
Command interval 10 ms min. (Minimum wait time after receiving the response from the device to the consecutive command transmission)
Slave address 1 to 32 (0x01 to 0x20) : DIP switch* selectable
Termination resistor Built-in termination resistor : DIP switch* selectable
RS485
Interface
MCU
Sensing
Element
X-Axis
Flow Sensor
Signal
Processing
Y-Axis
Flow Sensor
1. VCC
2. GND
3. NC
4. TRD(−)
5. TRD(+)
6. NC
7. GND
8. VCC
RJ-45
Connector
1. VCC
2. GND
3. NC
4. TRD(−)
5. TRD(+)
6. NC
7. GND
8. VCC
Pin Symbol Function
1 VCC Power Supply Voltage
2 GND Ground
3 NC Non-Connection
4 TRD(-) Serial Interface
5 TRD(+) Serial Interface
6 NC Non-Connection
7 GND Ground
8 VCC Power Supply Voltage
1
8
OFF
ON
Note: Slave address of the device = 1 + (5 bit of integer consisting of circuit
number 1 to 5).
Circuits Function ON OFF
8 Built-in termination resistor Enable Disable
7 Baud rate 38400bps 9600bps
6 None - -
5 Slave Address : bit 4 1 0
4 Slave Address : bit 3 1 0
3 Slave Address : bit 2 1 0
2 Slave Address : bit 1 1 0
1 Slave Address : bit 0 1 0