描述
產品名稱: 無綫電流數據記錄儀
生產產商: MICROEDGE INSTRUMENTS (CANADA)
產品系列: PRECISE-LOG
產品編號: PL-CW
PL-CW是一款8通道,電池供電,獨立且支持WIFI的電流數據記錄器。 記錄器記錄了八個外部電流源,並將數據保存在8 MB的內存中。
其鋁製外殼使它在最惡劣的工業環境中也表現出色。
嵌入式WIFI模塊可實現遠程數據監控和下載。 16位ADC使其非常適合需要精確測量的科學和實驗室應用。
只需在WIFI覆蓋區域為記錄器供電,即可從您的計算機訪問記錄器以進行配置,下載,查看圖形等等。
特徵:
- 16位模數轉換器
- 8 MB內存大小
- USB和WIFI通信。 波特率為115200 bps的接口
- 可編程輸入範圍(20 mA,50 mA)
- 超過10年的電池壽命
- 功能強大的軟件,用於配置,下載,繪圖,分析和警報報告
- 廣泛的採樣間隔選擇(一秒至十二小時)
- 堅固的鋁製外殼
Modbus
From July 15th, 2019, Modbus TCP protocol will be added to all PRECISE-LOG series of data loggers. A Modbus master/client can read one or more Input Registers and Holding Registers available in a PRECISE-LOG data logger through Modbus TCP communications. The below specifications list all supported commands and available registers PL-CW data logger supports:
Input Registers:
An Input Register stores a 16-bit integer for a channel’s real-time reading. To read one or more 16-bit Input register data, use function code 4.
Register |
Description |
Type |
Range |
0 |
CH0 Value |
Unsigned Integer |
0 - 65535 |
1 |
CH1 Value |
Unsigned Integer |
0 - 65535 |
2 |
CH2 Value |
Unsigned Integer |
0 - 65535 |
3 |
CH3 Value |
Unsigned Integer |
0 - 65535 |
4 |
CH4 Value |
Unsigned Integer |
0 - 65535 |
5 |
CH5 Value |
Unsigned Integer |
0 - 65535 |
6 |
CH6 Value |
Unsigned Integer |
0 - 65535 |
7 |
CH7 Value |
Unsigned Integer |
0 - 65535 |
Example:
To read CH2, CH3 and CH4's real-time values, a Modbus master device sends in the following command:
Data(HEX) |
Description |
Note |
0001 |
Transaction identifier |
Fixed 2-byte value |
0000 |
Protocol identifier |
Fixed 2-byte value |
0006 |
Length(6 bytes are followed) |
2-byte value |
01 |
The device address |
1-byte value, don't care |
04 |
Function Code (read Input Register) |
1-byte value |
0002 |
First register's address |
2-byte value |
0003 |
The number of required registers (read 3 registers 0002 to 0004) |
2-byte value |
Holding Registers:
A Holding Register stores a 16-bit integer indicating a setting for the data logger. To read one or more 16-bit Holding Register data, use function code 3.
Register |
Description |
Type |
Range/Equation |
0 |
Sample Interval |
0: below 1 second
>=1: sample interval in second |
0 - 65535 seconds |
1 |
Device Operating Mode |
0: logging stopped
1: logger is logging data |
|
X0 |
CHX-1 Type |
0: Range#0 (0 to 50 mA)
1: Range#1 (4 to 20 mA) |
|
X1 |
CHX-1 Enabled |
0:disabled
1:enabled |
If a channel is disabled, the reading is unknown |
X2 |
CHX-1 Equation |
0: Range#0 Current |
Range: 0 to 50 mA
Equation
O = 50 * I / 65535 |
1: Range#1 Current |
Range: 4 to 20 mA
Equation:
O = 16 * I / 65535 + 4 |
2: Linear |
O = (LRH – LRL) * I / 65535 + LRL
Where:
LRH is Linear Range high value
LRL is Linear Range low value
You can get those values from SiteView |
Where X = 1,2,3,4,5,6,7,8
O = Output, I = Input Register Value
Example:
To read CH3's equation, a Modbus master device sends in the following command:
Data(HEX) |
Description |
Note |
0001 |
Transaction identifier |
Fixed 2-byte value |
0000 |
Protocol identifier |
Fixed 2-byte value |
0006 |
Length(6 bytes are followed) |
2-byte value |
01 |
The device address |
1-byte value, don't care |
03 |
Function Code (read Holding Register) |
1-byte value |
002A |
First register's address (42 is 2A in HEX) |
2-byte value |
0001 |
The number of required registers (read 1 registers 002A) |
2-byte value |
Note:
- Modbus feature was added to firmware version 2.05 or above.To upgrade a data logger's firmware please refer to this link: How can I upgrade logger firmware?
- The age of an Input Register data is based the data logger's sample interval.If the logger has stopped logging or the logger's sampling interval is slower than five seconds, a request of Input Register data will initiate the sampling process and the new data will be available upon the next request.