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Field Type DCT Initial Access Modify Rec Proc PP
Monitor
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OUT OUTLINK Yes 0 No No N/A No
UNIT RECCHOICE Yes 0 Yes Yes No No
DLY DOUBLE Yes 0 Yes Yes Yes Yes
WIDE DOUBLE Yes 0 Yes Yes Yes Yes
ODLY DOUBLE No 0 Yes No No
OWID DOUBLE No 0 Yes No No
CTYP RECCHOICE Yes 0 Yes Yes No No
CEDG RECCHOICE Yes 0 Yes Yes No No
ECS SHORT Yes 0 Yes Yes No No
ECR DOUBLE Yes 0 Yes Yes No No
VAL RECCHOICE No 0 Yes Yes Yes No
PFLD USHORT No 0 Yes No No
LLOW RECCHOICE Yes 0 Yes Yes No No
TTYP RECCHOICE Yes 0 Yes Yes No No
HTS ENUM Yes 0 Yes Yes No Yes
STL INLINK Yes 0 No No N/A No
STV RECCHOICE Yes 0 Yes Yes No Yes
HOPR FLOAT Yes 0 Yes Yes No No
LOPR FLOAT Yes 0 Yes Yes No No
PREC SHORT Yes 0 Yes Yes No No
GATE RECCHOICE Yes 1 Yes Yes No Yes
GLNK INLINK Yes 0 Yes No N/A No
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Name Summary Description
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OUT Output Link This field is used by the device support routines to decide
where to send output. For soft records, it can be a
constant, a database link, or a channel access link. If the
link is a constant, the result is no output.
UNIT Time units Time units of delay and width. (Seconds, Milliseconds,
Microseconds, Nanoseconds, Picoseconds).
DLY Pulse Delay, in Delay after trigger edge until beginning of pulse.
UNITS of time
WIDE Pulse Width, in Width of pulse generated.
UNITS of time
ODLY Old Delay Value when last monitors for delay were triggered.
OWID Old Width Value when last monitors for width were triggered.
CTYP Clock Type Hardware/Software. If software selected, then clock
automatically determined by software. If hardware
selected, then clock determined by ECS and ECR.
CEDG Clock Signal Edge This can be Rising Edge or Falling Edge. This field forces
clock timing on rising or falling edge of source signal.
ECS External Clock If CTYP is internal, this field is ignored. If CTYP is
Source external, then this field is device dependent.
ECR External Clock Clock rate for external clock source.
Rate, in Hz
VAL Value This field is will contain value 1 if a trigger was detected
since the last time the record was processed and a 0
otherwise.
PFLD Processing Field This field is set to indicate if which of the following fields
changed since last processed: DLY, WIDE, STV, GATE, or
HTS.
LLOW Low Logic Level 0: Logic Low=0
1: Logic Low=1
TTYP Trigger Type. This field indicates where the pulse trigger will come
(Hardware/ from. Hardware indicates HTS will be used, software will
Software) use STL, STV.
HTS Hardware Trigger The source of the delayed pulse trigger.
source
STL Soft Trigger This value for STV will be read from here if this is set.
Location (Input
link)
STV Soft Trigger Value This can be enabled or disable. This will trigger a delayed
pulse if TTYP set to software and device allows it.
HOPR High Operating These fields determine the upper and lower display limits
Range for graphics displays and the upper and lower control
limits for control displays. The fields are used by record
support to honor calls to get_graphic_double or
get_control_double.
LOPR Low Operating
Range
PREC Display Precision Precision with which to display DLY. This field is used by
record support to supply a value when get_precision
is called.
GATE Gate for enable/ This field can be used to enable and disable the pulses.
disable of pulse
generation
GLNK Gate Location This field is used to determine where to get the value for
GATE.
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Next this routine initializes STV with the value of STL if STL type is CONSTANT link or creates a channel access link if STL type is PV_LINK.
GATE is likewise initialized if GLNK is CONSTANT or PV_LINK.
If device support includes init_record, it is called.
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Name Summary Description
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OUT Output Link This field is used by the device support routines to locate
its output.
WIDE Pulse Width Device support must use WIDE for pulse width
DLY Pulse Delay Device support must use DLY for the delay after trigger
edge until beginning of pulse.
LLOW Low Logic Level Device support must use to determine logic low level.
UNIT Time Units All values that refer to time measure will be in this time
unit.
VAL Value This field will contain a 1 if a trigger occured since the
last time the record was processed if the device supports
it.
PFLD Processing Field This field is used by some devices to indicate if the record
was scanned to adjust certain fields such as delay or
trigger source. If the device has a destructive read, then
changes to these types of fields will only could writes to
the device instead of a read and a write.
TTYP Trigger Type This field is used by the device support routines to force
triggering on leading or falling edge of signal if the
specified device supports it.
HTS Hardware Trigger This field wil be used to set the hardware trigger source if
Source the device supports it.
STV Soft Trigger Soure This field will be used for software to trigger an output
delayed pulse if the device supports it.
CEDG Clock Signal Edge This field is used by the device support routines to force
clock timing on leading or falling edge of signal.
CTYP Clock Type If CTYP is external, device support is responsible for
using ECR for the clock rate and if CTYP is internal, ECS
is the clock source.
ECS External Clock
Source
ECR External Clock Rate
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report()This routine is optional. If provided, it prints a report of all device modules.
init()This routine is called once during IOC initialization.
init_record(precord)This routine is optional. If provided, it is called by the record support init_record routine.
get_ioint_info(int cmd,struct dbCommon *precord,IOSCANPVT *ppvt)This routine is called by the ioEventScan system each time the record is added or deleted from an I/O event scan list. cmd has the value (0,1) if the record is being (added to, deleted from) an I/O event list. It must be provided for any device type that can use the ioEvent scanner.
write_pd(precord)This routine issues commands to the output device.
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