Datasheet

Interconnecting the communicator with the detector
Addendum, AutroFlame X33AF 116-P-X33AFADDENDUM/YGB, DEC P/N 95-8624, 2007-11-12, Autronica Fire and Security AS
Page 4
2. Interconnecting the
communicator with the detector
Point-to-Point Mode
The HART Communicator can connect to the X33AF at any wiring
termination point in the analog output signal loop. Connect the HART
communicator in parallel with the X33AF analog signal or load
resistor. The HART connections are non-polarized
IMPORTANT WIRING NOTE
The HART Communicator does not measure loop current directly, but
instead reads a voltage signal across a resistance (250 ohms) in the
loop. The recommended connection point is across the input
impedance of the signal receiver (PLC), which is a nominal 250 ohms.
See Figures 1 to 4. If testing/programming on a bench, a 250 ohm
load resistor must be used. See Figure 5.
Switch on the HART Communicator. If a device is found, the HART
Communicator displays the Main menu. If no device is found, check
the connections and verify the presence of a minimum of 250 ohms
load resistance in series in the loop.