美国OMEGA欧米茄DRA-DCC-8电流回路转换器

DRA-DCC-8是一种基于微处理器的装置，它将数字数据转换成八个连续的模拟电流回路。处理器控制数字输入，处理单元的活动存储器并更新当前输出。对于从000 hex到fff hex的数字输入范围，该单元提供两个用户选择的4至20 mA或0至20 mA的输出电流范围。一个并行端口和两个串行端口可用。并行输入端口接收由3位输出通道地址和代表输出电流值的12位数据组成的异步15位总线。DRA-DCC-8单元可与输入总线并联，并通过控制使能（E）输入终端进行选择。装置控制器持续扫描输入数据字段，并将其与先前存储的数据进行比较。

美国OMEGA欧米茄DRA-DCC-8电流回路转换器

Parallel/Serial Communications Ports

±0.1% Accuracy

12 Bit Resolution

Solid-State Technology

The DRA-DCC-8 is a microprocessor-based unit which converts digital data into eight continuous analog current loops. The processor controls the digital input, handles the active memory of the unit and updates the current outputs. For digital input range of 000 HEX to FFF HEX, the unit provides two user selected output current spans of either 4 to 20 mA or 0 to 20 mA. One parallel and two serial ports are available. The parallel input port receives an asynchronous 15 bit bus composed of a 3 bit output channel address and 12 bits of data representing the output current value. DRA-DCC-8 units can be connected in parallel to the input bus and selected by controlling the Enable (E) input terminal. The unit’s controller continuously scans the input data field and compares it to the previously stored data. When new data is encountered, the old data is replaced and the proper output current is updated. The DRA-DCC-8 provides both RS-232C and RS-422 full duplex serial communications ports. The RS-422 serial communications port enables use of up to eight DRA-DCC-8 units in a multi-drop configuration. A set of seven internal DIP switches enables parameters such as baud rate, unit identity code, digital input mode (parallel or serial) and output current span (4-20 mA or 0-20 mA) to be set by the user.

美国OMEGA欧米茄DRA-DCC-8电流回路转换器

当遇到新数据时，将替换旧数据并更新正确的输出电流。DRA-DCC-8提供RS-232C和RS-422全双工串行通信端口。RS-422串行通信端口允许在多点配置中使用多达8个DRA-DCC-8单元。一组七个内部DIP开关允许用户设置波特率、单位识别码、数字输入模式（并行或串行）和输出电流范围（4-20 mA或0-20 mA）等参数。