Supply Voltage Load Resistance For Smv Hart/De; Supply Voltage For Smv Modbus; Figure 14 - Transmitter Terminal Board And Grounding Screw - Honeywell SMV800 SmartLine User Manual

Loop wiring is connected to the Transmitter by simply attaching the positive (+) and negative (–)
loop wires to the positive (+) and negative (–) terminals on the Transmitter terminal block in the
Electronics Housing shown in Figure 14 Connect the Loop Power wiring shield to earth ground
only at the power supply end.

5.2.2 Supply Voltage Load Resistance for SMV HART/DE

HART Models: 10.8 to 42.4 Vdc at terminals (IS version limited to 30v)
0 to 1440 ohm (as shown in Figure 13).
DE Models: 15V to 42.4 Vdc at terminals (IS version limited to 30V)
0 to 900 Ohm (as shown in Figure 13).

5.2.3 Supply Voltage for SMV Modbus

Modbus (RS-485) Models: 9.5V to 30 Vdc at terminals.
Power Consumption:
Average power consumption is 70mW at 9.5V Supply. This includes RS-485 communication at
9600 baud rate at a rate of once per second without termination at room temperature. (Figure 18).
As shown in Figure 14 each Transmitter has an internal terminal to connect it to earth ground.
Optionally, a ground terminal can be added to the outside of the Electronics Housing. Screw
terminals 1, 2, 3, 5, 6, 7 & 8 only required for single input. Terminals 4 and 9 are used for Modbus
devices only. See section
Wiring must comply with local codes, regulations and ordinances. Grounding may be
required to meet various approval body certification, for example CE conformity. Refer to
Appendix A of this document for details.
CAUTION: For proper operation of the transmitter, grounding of the
transmitter is mandatory. This minimizes the possible effects of noise on the
output signal and affords protection against lighting and static discharge
For HART DE the Transmitter is designed to operate in a 2-wire power/current loop with
loop resistance and power supply voltage within the operating range; see
Revision 10
Figure 14 – Transmitter Terminal Board and Grounding Screw
5.3.5.
SMV800 Transmitter User's Manual
Figure 13.
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