Long String Input Record (lsi)

The long string input record is used to retrieve an arbitrary ASCII string with a maximum length of 65535 characters.

Parameter Fields

The record-specific fields are described below, grouped by functionality.

Scan Parameters

The long string input record has the standard fields for specifying under what circumstances it will be processed. These fields are listed in Scan Fields.

Input Specification

The INP field determines where the long string input record obtains its string from. It can be a database or channel access link, or a constant. If constant, the VAL field is initialized with the constant and can be changed via dbPuts. Otherwise, the string is read from the specified location each time the record is processed and placed in the VAL field. The maximum number of characters in VAL is given by SIZV, and cannot be larger than 65535. In addition, the appropriate device support module must be entered into the DTYP field.

Field	Summary	Type	DCT	Default	Read	Write	CA PP
VAL	Current Value	STRING or CHAR[SIZV]	No		Yes	Yes	Yes
OVAL	Old Value	STRING or [SIZV]	No		Yes	No	No
SIZV	Size of buffers	USHORT	Yes	41	Yes	No	No
INP	Input Specification	INLINK	Yes		Yes	Yes	No
DTYP	Device Type	DEVICE	Yes		Yes	Yes	No

Monitor Parameters

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

Operator Display Parameters

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

Alarm Parameters

The long string input record has the alarm parameters common to all record types. Alarm Fields lists the fields related to alarms that are common to all record types.

Run-time Parameters

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	Old 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

Simulation Mode Parameters

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 fetched 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 Input 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 Input Link	INLINK	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

Device Support Interface

The record requires device support to provide an entry table (dset) which defines the following members:

typedef struct {
    long number;
    long (*report)(int level);
    long (*init)(int after);
    long (*init_record)(lsiRecord *prec);
    long (*get_ioint_info)(int cmd, lsiRecord *prec, IOSCANPVT *piosl);
    long (*read_string)(lsiRecord *prec);
} lsidset;

The module must set number to at least 5, and provide a pointer to its read_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 an init_record() routine to configure the record instance and connect it to the hardware or driver support layer.

Device Support for Soft Records

A device support module for DTYP Soft Channel is provided for retrieving values from other records or other software components.

Device support for DTYP getenv is provided for retrieving strings from environment variables. INST_IO addressing @<environment variable> is used on the INP link field to select the desired environment variable.