X25AM Programming Manual

Contents

X25AM Programming Manual—527201-001

iii

2. ITI Applications (continued)

Terminal Reset 2-14

Optimizing Output Data from 6530 Terminals 2-14

Data Processing 2-16

Forwarding Data from the PAD 2-16

Data Packetizing by ITI 2-17

Disposition of Terminal Control Characters by ITI 2-18

ITI Application Programming 2-20

ITI Programming Tasks 2-20

ITI Procedure Statements Summary 2-25

ITI Programming Example 2-45

3. PTP Applications

Overview of PTP Protocol 3-1

The PTP File-System Interface 3-2

File-System Procedures Supported by PTP 3-2

Initiating a Call 3-2

Waiting for a Call 3-3

Exchanging Data 3-3

Clearing a Call 3-4

PTP Data-Exchange Modes 3-5

D, Q, and M Bits 3-6

Mode 0 3-7

Mode 1 3-8

Mode 2 3-9

Mode 3 3-21

Subdevice States 3-23

The Two-Step Read 3-23

PTP Application Programming 3-24

PTP Programming Tasks 3-24

PTP Procedure Statements Summary 3-29

Programming Examples Using a Permanent Virtual Circuit 3-43

Start the Data Exchange (Use Mode 0) 3-43

Wait for the Data Exchange (Use Mode 0) 3-45

Programming Examples Using a Switched Virtual Circuit 3-47

Start the Data Exchange (Use Mode 0) 3-47

Wait for the Data Exchange (Use Mode 0) 3-49

Start the Data Exchange (Use Mode 1) 3-50

Wait for the Data Exchange (Use Mode 1) 3-52