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DS18B20 data acquisition workstation

SLET1000-D is a long-range digital temperature acquisition system 240 can also connect digital temperature sensor (a total of 10 routes, each way up to 24) to RS232 digital communication methods Ibid.
Technical parameters
Technical parameters:
Sensor DS18B20, SLST1-1, SLST1-2, SLST1-3
Shows that temperature range 0 ¡æ ~ +125.0 ¡æ
Display resolution 0.1 ¡æ
Temperature measurement accuracy of 0.5 ¡æ
4s/240 point measurement speed
Channel number of 10 channels, each channel can be accessed by the most 24 points
19200 baud rate (baud rate can be customized to other)
Communication port RS232 (optional CAN, RS485 or Ethernet)
DC 5V 1A power supply
5W power
Weight of 1000 grams
Storage temperature -20 ~ 80 ¡æ
Operating Environment: -40 ¡æ ~ +85 ¡æ
Support the measurement cable length <350m
Dimensions 200 ¡Á 70 ¡Á 175mm3

Features
1. To provide secondary development of communication protocol for the secondary development
2. Sensor acquisition bus routing, wiring is simple and convenient and flexible.
3. To facilitate networking, workstations have their own ID
4. Can be read into the sensor
5. Can be read online the only 64-bit sensor serial number
6. Support of the measuring point 240 DS18B20
Connection

1. Power Supply
The equipment used in power for DC5V, maximum voltage is not allowed more than 5.8V, the minimum voltage of not less than 4.5V
Randomly assigned to the power supply DC5V 1A, if the sensors more and longer lead time, recommend the use of the 2A-3A Power Supply DC5V.
2. Communication I
The local standard communication interface for RS232, when necessary RS485 communications can be an external RS232/RS485 converter to extend the communication distance, because the equipment has a unique ID, the machine for 01, an external RS232/RS485 converter network equipment can be.
3. Sensor Interface
Three-line sensor system bus. See connection scheduling, VCC, GND for power supply to the sensor. DQn channel number for the sensor, the device a total of 10 channels, that is, DQ1, DQ2, ... DQ10
     Each channel can be accessed by 24 sensors, the most common line is not more than 80 meters long, if the communication distance of more than 100 meters, it is recommended to use coarse core of the twisted-pair (signal twisted pair line and ground).
Communication protocol
A, RS232 serial communication of the agreement:
Baud Rate: 19200, data bits: 8; stop bits: 1; Check: None. Can not be changed.
Second, the application layer protocol:
All data and commands must be all ASCII characters.
ASCII character data to # (ASCII code: 0x23) starting command to ASCII characters @ (ASCII code: 0x40) to start. Data and commands are in ASCII characters at the end of 0x0d and 0x0a.
Third, communications operation
1. Read temperature
Computer to send command:
@ T [device address] [0D] [0A]
[Device address] account for two-byte, the first byte is always 00, followed by a byte address for the actual node.
Address inquiries for equipment such as an all temperature data:
For example: the command (the command in hexadecimal) as: [40] [54] [00] [01] [0D] [0A]
 
Equipment in response to:
! [Device address] # T [device address] [SUBinfo1] [SUBinfo 2] ... [SUBinfon] [0D] [0A]
! For the pre-Fu, # T-based functions of order No.
[Device address] for the device address, or two bytes, where the return address information constituted by the ASCII characters, such as the device address is 01, corresponding to the two hexadecimal values for the 30 31
Constitute a sensor information
Sensor information that is [SUBinfo n] constituted by the following information:
[ID] [SUBID] [data0] [data1] ... [data5] a total of 10 ASCII code.
[ID] as the channel number, the equipment, a total of 10 channels, ASCII value of the range of 01-0A
[SUBID] Sensor number for each channel a maximum of 24 sensors then, numbers from 61 onwards, the value of the range of :61-78
[data0] [data1] ... [data5] that the actual measurement data, a total of 6 ASCII code. Temperature measurement data is the code of the ASC, including units, can be directly displayed. When the sensor is not received, the display "Error!"
For example, send the command in hexadecimal: 40 54 00 01 0d 0a
Equipment, the return value (the value for the ASCII characters) as follows:
! 01 # T00F00161 28.60162 28.70163 0.00164 28.60165 28.70166 28.80167 0.00168 28.70169 28.8016A 0.0016B 0.0016C 0.0016D 0.0016E 0.0016F 0.00170 0.00171 0.00172 0.00173 0.00174 0.00175 0.00176 0.00177 0.00178
 
2. Long-range time into a specified channel ID and serial number
DS18B20 practical application in the workstation before you will need to read all the sensor information to the location of the corresponding channel.
Computer to send command:
@ S [channel address] [sensor number] [0D] [0A]
@ S to order at
[Device address] for the device address, or two bytes, the equipment, a total of 10 channels, each channel can be accessed by 24 sensors, the range of equipment addresses the value :01-0A, for example, address 1, hexadecimal value for 00 01, address 10, a value of hexadecimal 00 0A
[Sensor number] account for the two bytes that form the first channel in the designated number of its location. Value range is 1-24, corresponding hexadecimal for :01-18
Back from the machine to operate correctly:
@ OK [channel address] [sensor number]
Failed to restore proper operation from the machine:
@ ERR4 [channel address] [sensor number]
Table operation ERR4 overtime, not being able to handle.
For example:
To have access to the current sensor DQ1 (only then a) the serial number stored in the channel 1, 2 position, the hexadecimal command as follows:
40 53 00 01 00 02 0d 0a
Back from the machine: @ OK0102 Table The sensor only has a 64-bit serial number stored in the device, the sensor can be a normal collection.
If the reply from the machine: @ ERR40102 table when equipment busy, unable to correctly handle the PC into the operation of reading the request to be separated at this time three seconds after the re-those operations until the return from the machine @ OK0102

3. See the specified channel ID and serial number
@ U [channel address] [sensor number] [0D] [0A]
@ U [channel address] [sensor number] [0D] [0A]
Orders @ U for Fu
[Device address] for the device address, or two bytes, the equipment, a total of 10 channels, each channel can be accessed by 24 sensors, the range of equipment addresses the value :01-0A, for example, address 1, hexadecimal value for 00 01, address 10, a value of hexadecimal 00 0A
[Sensor number] account for the two bytes that form the first channel in the designated number of its location. Value range is 1-24, corresponding hexadecimal for :01-18
Equipment return:
  UPOK [64 Sequence No.]
From Table UPOK specify the location of the correct 64-bit serial number of sensors
[64-bit serial number] 16 bytes total (all ASCII value)
For inquires about channel location 1 2
Order to: 40 53 00 01 00 02 0d 0a
Back from the machine: UPOK28B993E201000093
28B993E201000093 table for the serial number of the sensors 28 B9 93 E2 01 00 00 93, that is, the value system should be 16: 28 B9 93 E2 01 00 00 93

Hits£º   Date£º 2009-10-28  ¡¾Print this Page¡¿ ¡¾Close¡¿