252301 Issue 2.0.pdf - 第49页

GEM Manual for DEK Printers Capabilities I ssue 2.0 June 9th, 2011 page 49 of 156 5.12 Spooling I n the event that a co mmunication failure occur s the DEK printer is capable of spooling message s into non-volatile stora…

GEM Manual for DEK Printers Capabilities

Issue 2.0 June 9th, 2011 page 48 of 156

To illustrate, an example is given, assuming that UPPERDB = LOWERDB = 100. The list shows

consecutive readings of the variable and the resultant zone:

99 Lower Zone (Initial reading)

101 Upper Zone (Zone transition)

100 Lower Zone (Zone transition)

100 Lower Zone

99 Lower Zone

100 Upper Zone (Zone transition)

Transition from one zone into another generates a collection event, as might be reported via S6F11.

The host has the option of receiving notification by enabling event reporting for the event. For each

variable that has monitoring capability, one CEID is reserved to indicate zone transitions for that

variable. To aid in the determination of the nature of a transition event, three DVVAL's have been

defined: LimitVariable, EventLimit and TransitionType.

Scenarios:

Host defines limit attributes:

Comments Host Equipment Comments

[IF] S2, F45 is Multi-block

[THEN] Send Multi-block inquire

S2F39 -->

<-- S2F40 Multi-block grant.

[END IF]

Host defines new variable limit

attributes

S2F45 -->

<-- S2F46 Equipment acknowledges Host request.

Host queries equipment for current limits:

Comments Host Equipment Comments

Host queries Equipment for current

variable limit attribute definitions

S2F47 -->

<-- S2F48 Equipment returns report containing requested

variable limit attribute values.

Examples of applying limits monitoring for different applications are shown in SEMI E30-95

Appendix 7.

GEM Manual for DEK Printers Capabilities

Issue 2.0 June 9th, 2011 page 49 of 156

5.12 Spooling

In the event that a communication failure occurs the DEK printer is capable of spooling messages into

non-volatile storage. These messages can be recovered for transmission when the communications link

is restored.

5.12.1 Definitions

MaxSpoolTransmit: An equipment constant containing the maximum number of messages that the

equipment will transmit from the spool in response to an S6F23 "Transmit Spooled Messages" request.

If MaxSpoolTransmit is set to zero, no limit is placed on the messages sent from the spool. Multi-block

inquire/grant messages are not counted in this total.

OverWriteSpool: An equipment constant used to indicate to the equipment whether to overwrite data

in the spool area or to discard further messages whenever the spool area limits are exceeded.

Send Queue: Refers to the queue into which equipment generated SECS messages are placed in

preparation for transmission to the host.

Spool: The spool is an area of non-volatile storage in which the equipment stores certain messages that

cannot be delivered to the host (when the equipment is in the NOT COMMUNICATING substate of

COMMUNICATIONS ENABLED).

SpoolCountActual: A status variable used to keep a count of the messages actually stored in the

equipment's spool area. Multi-block inquire/grant messages are not spooled and not included in this

count.

SpoolCountTotal: A status variable used to keep a count of the total number of primary messages

directed to the spool, regardless of whether placed or currently retained in the spool. Multi-block

inquire/grant messages are not spooled and not included in this count.

SpoolFullTime: A status variable containing the timestamp when the spool last became full. If the

spool was not filled during the last spooling period, this will contain a time value prior to the current

SpoolStartTime.

SpoolStartTime: A status variable containing the timestamp from when spooling was last activated.

GEM Manual for DEK Printers Capabilities

Issue 2.0 June 9th, 2011 page 50 of 156

5.12.2 Spooling State Model

There are two major states of spooling: SPOOL INACTIVE and SPOOL ACTIVE. SPOOL ACTIVE

has two components: SPOOL UNLOAD and SPOOL LOAD. These are each broken into substates.

The POWER OFF and POWER ON parent states are common to all equipment subsystems. They are

shown here to illustrate the retention of spooling context during a power down situation.

NOTE: Disabling SECS communications does not affect the current spooling state since no messages

are generated until communications are subsequently enabled. Spooling is effectively frozen in this

case.

POWER OFF - The printer has lost power for any reason.

POWER ON - The printer is powered up.

SPOOL INACTIVE - This is the normal operating mode. No spooling occurs. The spool area is

empty. Primary SECS-II messages are transmitted normally.

SPOOL ACTIVE - All primary SECS-II messages ready for sending and for which spooling is

enabled (see S2F43) are directed to the spool area. All other primary messages, except Stream 1, are

discarded. The printer will attempt to send any secondary messages that are generated and discard these

messages should the attempt to send fail.

State Diagram:

SPOOL OUTPUT

PURGE

SPOOL

TRANSMIT

SPOOL

NO SPOOL

OUTPUT

SPOOL

NOT FULL

SPOOL

FULL

SPOOL

INACTIVE

POWER

OFF

POWER ON

SPOOL UNLOAD

SPOOL LOAD

SPOOL ACTIVE

Once communications are established, the host must initiate the spool unload sequence to restore full

functionality. Since the printer will deliver secondary messages, the host may inquire for information

or send commands as needed.