DPMS XPQ, User Manual

Page: 35 / 134

33
POWER INSTRUMENTS
programmed as energy pulse output. For example, DO1 is used as energy
pulse output and DO2 is used as reactive energy pulse output. The pulse width
and pulse constant can be set.
When the digital output is used as an over limit alarm output, the upper and
lower limit of the parameter, time interval and output port can be set. A drawing
of the alarming output with beeper is in fig 2.31.
fig 2.31 Do Alarming Circult
The wire for digital output should be between AWG22 (0.5mm
2
) ~AWG16
(1.3mm
2
).
Communication
The communication port and protocol of the DPMS XPQ are RS485 and
Modbus-RTU. The communication terminals are A, B, and S (11, 12, 13). A is
differential , B is differential signal - and S is connected to the shield of
the twisted pair cable. Up to 32 devices can be connected on an RS485 bus.
Use good quality shielded twisted pair cable, AWG22 (0.5mm
2
) or larger. The
Fig 2.31 DO Alarming Circuit
Power
Supply
Photo -Mos
Acuvim -X
Beeper