Polarity Selection For Do3 And Do4 Vs Do1 And Do2 - Pacific Power Source LMX Series Operation Manual

Events that can be assigned to digital outputs are listed in the table below and can be set
using the Function field.
EVENT
FAULT
FORM
HIGH
LOW
OUTPUT STATE
PROGRAM
REMOTE
TRANSIENT
XFMR_COUPLING

7.12.6 Polarity Selection for DO3 and DO4 vs DO1 and DO2

The two open drain outputs DO3 and DO4 have internal 1 kΩ pull-up resistors to +5.5V.
These outputs can be used as regular digital outputs (open-drain type) if needed. However,
the logic will be inverted because a "direct" logic for the relay drive means an "inverted"
logic for the open drain output. The FET being on means the relay coil active, but with a pull-
up the output goes to low.
DO3 and DO4 use direct logic for the relay drive, which means that if the inverting logic is
not active and there is a "1" written to the digital output, an internal FET will be activated
causing a "low" in the open drain output.
Each digital output can be configured to have separate inverting logic, so the user can
configure these 2 to be inverting and have the normal direct logic when used as open-drain
outputs.
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Entire Contents Copyright 2018 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
LMX Series Power Source Operation Manual
SECTION 7: Auxiliary I/OError! Reference source not found.
Digital Output Assignable Events
Description
Output goes high on fault event
Output FORM state
Fixed Output high
Fixed Output low
Output Relay State
Output goes high when Program is selected
Output goes high when unit is in REMOTE state
Output goes high when transient is running
Indicates output coupling mode
Table 7-5: AUX I/O Digital Output assignable Events or Conditions
LMX SERIES™ OPERATION MANUAL
Indication
1 = Fault occurred, 0 = No Fault
1 = SINGLE, 0 = SPLIT/THREE
1 = ON
0 = OFF
1 = ON (enabled), 0 = OFF (disabled)
1 = Steady State Program, 0 = Manual mode
1 = REMOTE state, -0 = LOCAL state
1 = Running/Paused/Stepping, 0 = Stopped
1 = Transformer Coupled, 0 = Direct Coupled
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