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Current loop - Wikipedia, the free encyclopedia (592 words) |
 | For digital serial communications a current loop is a communication interface that uses current instead of voltage for signaling. |
| A digital current loop uses the absence of current for high (mark), and the presence of current in the loop for low(space). |
| For industrial process control instruments, analog 4-20 mA and 10-50 mA current loops are commonly used for analog signaling, with 4 mA representing the lowest end of the range and 20 mA the highest. |
| Current Loop Application Note: 3.0 Current Loop Interface Connections (335 words) |
| What this means is: does the port have an internal power supply that provides the current (active) for the transmitter, the receiver, or both (transmitter and receiver). |
| Interconnection of the two current loop devices is different depending on whether your unit is active or passive. |
| Interconnection of two B&B current loop converters also requires the use of a 12 VDC power supply since they are both passive port. |
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