Campbell CR6 Series, Руководство оператора

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Section 8. Operation
476
code snip turns the modem on for ten minutes at the top of the hour using the
TimeIntoInterval() instruction embedded in an If / Then logic statement:
If TimeIntoInterval ( 0,60,Min) Then PortSet (9,1) 'Port “9” is the
SW12V Port. Turn phone on.
If TimeIntoInterval (10,60,Min) Then PortSet (9,0) 'Turn phone
off.
TimeIsBetween()
returns
TRUE
if the CR6 real-time clock falls within the
specified range; otherwise, the function returns FALSE . Like
TimeIntoInterval() , TimeIsBetween() is often embedded in an If / Then logic
statement, as shown in the following code snip.
If TimeIsBetween (0,10,60,Min) Then
SW12 (1) 'Turn phone on.
Else
SW12 (0) 'Turn phone off.
EndIf
TimeIsBetween() returns TRUE for the entire interval specified whereas
TimeIntoInterval() returns TRUE only for the one scan that matches the interval
specified.
For example, using the preceding code snips, if the CRBasic program is sent to
the datalogger at one minute past the hour, the TimeIsBetween() instruction will
evaluate as TRUE on its first scan. The TimeIntoInterval() instruction will
evaluate as
TRUE
at the top of the next hour (59 minutes later).
• Note START is inclusive and STOP is exclusive in the range of time
that will return a TRUE result. For example:
TimeIsBetween (0,10,60,Min) will return TRUE at 8:00:00.00 and
FALSE at 08:10:00.00.
8.3.1 Terminals Configured for Control
U
and
C
terminals can be configured as output ports to set low (0 Vdc, turn off)
or high (3.3 or 5 Vdc, turn on) using the PortSet() or WriteIO() instructions.
Terminals can also be configured for pulse-width modulation. See Pulse Width
Modulation — Specifications
(p. 114).
A terminal configured for digital I/O is
normally used to operate an external relay-driver circuit because the port itself has
limited drive capacity. For current sourcing limit, or drive capacity, see Omnibus
Current Source and Sink Limits — Specifications
(p. 124).
8.4 Measurement and Control Peripherals — Details
Related Topics:
• Measurement and Control Peripherals — Overview
(p. 92)
• Measurement and Control Peripherals — Details
(p. 476)
•
Measurement and Control Peripherals — Lists
(p. 652)
Peripheral devices expand the CR6 input and output capacities. Some
peripherals are designed as SDM (synchronous devices for measurement) or
CDM (CPI devices for measurement). SDM and CDM devices are intelligent