The long string output record is used to write an arbitrary ASCII string with a maximum length of 65535 characters.
The record-specific fields are described below, grouped by functionality.
The long string output record has the standard fields for specifying under what circumstances it will be processed. These fields are listed in Scan Fields.
The long string output record must specify from where it gets its desired output string.
The first field that determines where the desired output originates is the output mode select (OMSL) field,
which can have two possible value: closed_loop or supervisory.
If supervisory is specified,
DOL is ignored,
the current value of VAL is written,
and VAL can be changed externally via dbPuts at run-time.
If closed_loop is specified,
the VAL field's value is obtained from the address specified in the desired output location field (DOL) which can be either a database link or a channel access link.
The maximum number of characters in VAL is given by SIZV, and cannot be larger than 65535.
DOL can also be a constant in addition to a link,
in which case VAL is initialized to the constant value.
Your string constant,
however,
may be interpreted as a CA link name.
If you want to initialize your string output record,
it is therefore best to use the VAL field.
Note that if DOL is a constant,
OMSL cannot be closed_loop.
Field Summary Type DCT Default Read Write CA PP VAL Current Value STRING or CHAR[SIZV] No Yes Yes Yes SIZV Size of buffers USHORT Yes 41 Yes No No DOL Desired Output Link INLINK Yes Yes Yes No OMSL Output Mode Select MENU (menuOmsl) Yes Yes Yes No
The output link specified in the OUT field specifies where the long string output record is to write its string. The link can be a database or channel access link. If the OUT field is a constant, no output will be written.
In addition, the appropriate device support module must be entered into the DTYP field.
Field Summary Type DCT Default Read Write CA PP OUT Output Specification OUTLINK Yes Yes Yes No DTYP Device Type DEVICE Yes Yes Yes No
These parameters are used to specify when the monitor post should be sent by the monitor() routine.
There are two possible choices:
APST is used for archiver monitors and MPST for all other type of monitors.
Field Summary Type DCT Default Read Write CA PP MPST Post Value Monitors MENU (menuPost) Yes Yes Yes No APST Post Archive Monitors MENU (menuPost) Yes Yes Yes No
See Fields Common to All Record Types for more on the record name (NAME) and description (DESC) fields.
Field Summary Type DCT Default Read Write CA PP NAME Record Name STRING [61] No Yes No No DESC Descriptor STRING [41] Yes Yes Yes No
The long string input record has the same alarm parameters common to all record types. Alarm Fields lists the fields related to alarms that are common to all record types.
The IVOA field specifies an action to take when the INVALID alarm is triggered.
When Set output to IVOV,
the value contained in the IVOV field is written to the output link during an alarm condition.
See Invalid Output Action Fields for more information on the IVOA and IVOV fields.
Field Summary Type DCT Default Read Write CA PP IVOA INVALID Output Action MENU (menuIvoa) Yes Yes Yes No IVOV INVALID Output Value STRING [40] Yes Yes Yes No
The old value field (OVAL) of the long string input record is used to implement value change monitors for VAL. If VAL is not equal to OVAL, then monitors are triggered. LEN contains the length of the string in VAL, OLEN contains the length of the string in OVAL.
Field Summary Type DCT Default Read Write CA PP OVAL Previous Value STRING or [SIZV] No Yes No No LEN Length of VAL ULONG No Yes No No OLEN Length of OVAL ULONG No Yes No No
The following fields are used to operate the record in simulation mode.
If SIMM (fetched through SIML) is YES, the record is put in SIMS severity and the value is written through SIOL. SSCN sets a different SCAN mechanism to use in simulation mode. SDLY sets a delay (in sec) that is used for asynchronous simulation processing.
See Output Simulation Fields for more information on simulation mode and its fields.
Field Summary Type DCT Default Read Write CA PP SIML Simulation Mode link INLINK Yes Yes Yes No SIMM Simulation Mode MENU (menuYesNo) No Yes Yes No SIOL Simulation Output Link OUTLINK Yes Yes Yes No SIMS Simulation Mode Severity MENU (menuAlarmSevr) Yes Yes Yes No SDLY Sim. Mode Async Delay DOUBLE Yes -1.0 Yes Yes No SSCN Sim. Mode Scan MENU (menuScan) Yes 65535 Yes Yes No
The record defines a device support entry table type lsodset in the generated lsoRecord.h file as follows:
typedef struct lsodset {
dset common;
long (*write_string)(struct lsoRecord *prec);
} lsodset;
#define HAS_lsodset
The support module must set common.number to at least 5, and provide a pointer to its write_string() routine; the other function pointers may be NULL if their associated functionality is not required for this support layer. Most device supports also provide a common.init_record() routine to configure the record instance and connect it to the hardware or driver support layer.
Device support for DTYP Soft Channel is provided for writing values to other records or other software components.
Device support for DTYP stdio is provided for writing values to the stdout, stderr, or errlog streams. INST_IO addressing @stdout, @stderr or @errlog is used on the OUT link field to select the desired stream.