Asynchronous Terminals and Printer Processes Programming Manual

PROCEDURE CALLS FOR ACCESSING TERMINALS

Page Mode

S5073-002

Application I/O Process LIU Device

WRITE

(Screen)

READ

(Function key)

WRITE

Completion

READ

WRITE

(EOT)

WRITEREAD

(Block 1)

WRITEREAD

(Block 2)

WRITEREAD

(Last block)

WRITE

Completion

WRITE

(EOT)

WRITEREAD

(ENQ)

WRITEREAD

(ACK)

READ

Completion

ACK

Function Key

EOT

READ

Completion

•

Figure 3-2. Page Mode Example

Once the message is received, the READ completes. The applica-

tion reads the screen with a WRITEREAD. The protocol module

issues WRITEREADs to the terminal. After all blocks have been

received, the WRITEREAD is completed as shown in Figure 3-3.

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