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Series 3050 Btu Monitor
OUTPUT OPTION CARD
If the Series 3050 Btu Monitor was ordered with the Output Option card, it will have several additional outputs.
1. Analog Output ( 0-20mA; or 4-20mA ) which can be converted externally to 0-5VDC, 1-5VDC with a 250 Ohm resistor; or
0-10VDC or 2-10VDC with a500 Ohm resistor. A 15VDC power supply is provided to permit current sinking or sourcing. The
Series 3050 has special software that permits the Analog output.
2. USB for direct access to a computer using a standard mini-USB cable.
3. RS-485 for fully addressable Modbus or BACnet communication.
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1 RS485 B
2 RS485 A
3 RS485 GND
4 LOOP +
5 LOOP -
6 GND
Figure 12: Current Sourcing Analog Output
1 RS485 B
2 RS485 A
3 RS485 GND
4 LOOP +
5 LOOP -
6 GND
Figure 13: Current Sinking Analog Output
Figure 12
RS485 Communication
1 RS485 B
2 RS485 A
3 RS485 GND
4 LOOP +
5 LOOP -
6 GND
Figure 14: RS485 Communication (Modbus and BACnet)
Figure 13
Model 3700
Model 345WT
or other
MODBUS
Master
Device
Shield
RS485 -
RS485 +
6-11
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