Operating instructions

AMC-DTR Sensor Transmitter User Manual
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a “star” pattern for reliable operation. The “end of line” unit should have J1 installed in the ‘A’
position for terminating resistor installation. All others should have J1 in the ‘B’ position. Front
panel Rx / Tx LEDs are helpful troubleshooting tools.
Figure 8: RS-485 Modbus Wiring
4.8 Isolated 4-20mA Output DTR-10-0250 Option
Description:
The optional DTR-10-0250 Isolated 4-20mA option (Figure 9) provides dual 4-20mA outputs that
are electrically isolated from sensor inputs and the 24 VDC power source. Each 4-20mA output
share the same common terminal and are not isolated from each other. This board is
“piggybacked” behind the DTR-10-0232 Display Assembly (Figure 5). Addition of this option
requires 4-wire mode 4-20mA operation and thereby requires the DTR-10-0233 I/O Power
Supply board (Figure 6).
Figure 9: DTR-10-0250 Isolated 4-20mA Output Option