CPT6010 Operating Instructions
15
Digital Pressure Transducer
CPT6010
For RS-485 serial operation, connect the host computer to the CPT6010 the diagram shown in
Figure 5.6.3. Notice that the host TRANSMIT lines are connected to the CPT6010 RECEIVE lines,
TA to RA, TB to RB, and so on.
If only one RS-485 CPT6010 will be connected to the system, disregard the wiring to “CPT #1” and
“CPT #2” in the illustrations. Instead, wire the computer directly to the “CPT #31” by the four-wire
method.
To connect multiple RS-485 CPT6010’s to a single host, use the full multi-drop wiring shown in Fig-
ure 5.6.3. Only full duplex (4-wire) connection is recommended. In the configuration, one computer
can communicate with up to 31 CPT6010’s without a repeater, but each CPT6010 in the system
must have a unique address. The signal is simultaneously distributed to each transducer connect-
ed to the parallel path. Each CPT6010 responds only to commands or queries directed to its own
address. Removal of one or more CPT6010’s from the line has no effect on the remaining devices.
Terminating resistor examples are shown and should be determined by the end user when cabling
extremes are required. Resistor values are selected to match the characteristic impedance of the
transmission line, typically 100 to 120 ohms.
Due to the nature of the various RS-485 converters available there may be
communication issues. We have determined that our devices work with the
ACCES I/O PRODUCTS devices. At this time we are not in a position to com-
ment on any other make of RS-485 converters and their suitability for use
with our products.
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