Xylem H-5223 - Manual (Page 29)

Digital Input: General purpose input returns a 1 or a 0. Typical application is a gate
position, open or closed. This is the default mode.
Counter Input: The pin is used as a counter input. A falling edge (5 volts to 0 volts)
causes a counter to increment by the count / encoder inc value. Typical
application is a tipping bucket rain gauge.
Encoder Input: If both inputs are set to this mode then a standard quadrature shaft encoder
may be used for stage readings. Normally Phase A of the encoder would
be connected to digital I/O 1 and Phase B would be connected to digital
I/O 2. A ground wire is also connected between the encoder and the H-
5223. Each change of state of the encoder will cause the encoder value to
increment or decrement at a rate set by the count / encoder inc setting.
On At Scan: This is an output mode that will cause the pin to automatically turn on
(driven high) before each scan and turn off at the end of the scan. At the
beginning of the scan when this pin is driven high, the scanning process
will be delayed for a time period set by the ‘Pulse /Delay’ option. A
typical application is to turn on a pump during each scan.
Output Pulse: This output option is used to pulse or turn on the output for a duration set
by the ‘Pulse / Delay’ option if a user defined condition exists. This
output will be pulsed sometime during the scan process. The condition is
defined by using the ‘Trigger Source” option, the “Trigger Mode’ option
and the “Trigger Set Point” option as defined below. A typical application
is to trigger an automatic water sampler that requires a 1 second pulse to
start its process.
Output Cont. This output option is used to turn on the output continuously when a user
defined condition occurs and to stay on until the condition goes away. The
condition is defined by using the ‘Trigger Source” option, the “Trigger
Mode’ option and the “Trigger Set Point” option as defined below. A
typical application is to turn on a warning light when a water level is too
high. The condition will be evaluated on each scan.
NOTE: On output modes; the H-5223 checks to see if the digital output mode is set for
“Output Pulse” or “Output Cont.” automatically at the end of each scan if it is not
set as source for logging or for GOES. At this time the output is activated if
needed. If it is set as a source for logging or GOES then the user defined
condition is check at that point and the output set or cleared at that point in time,
not at the end of the scan.
D - Pulse Length / Warm Up Delay
This option is used to define a pulse length when the digital I/O is set for pulsed output mode
and is used to define a warm up delay when the digital I/O is set for “On At Scan” output
mode.
Pulsed Output Mode: As defined, the system checks the mode of the digital I/O and if it
H-5223
Remote Operation (Menu Mode) 3-7