Citect for Windows Driver Specification DanBuss DNIP Driver

Driver Design Specification
Contents
1. TARGET DEVICE(S) AND PROTOCOL 4
1.1 Introduction 4
1.2 Device Manufacturer 4
1.3 Device Definition 4
1.4 Communications Method 4
1.5 Communications/Hardware Configuration 4
1.5.1 PC-GW PC Cable 5
1.5.2 I/O Device Settings 5
1.5.3 Software Setup 5
2. PROTOCOL REQUIREMENTS 6
2.1 Introduction 6
2.2 Initialising the Port 6
2.3 IO Device Online Test 6
2.4 State Flow Description 6
2.5 Message Structure 6
2.6 Data Format 7
2.7 Checksum 7
2.8 Extended Protocol Description 7
2.9 Error Handling 7
3. GENERAL DRIVER DESCRIPTION 8
3.1 Cache 8
3.2 Request Performance 8
3.3 Reads and Request Priority 8
3.4 DANBUSS Performance 8
3.5 Writes 9
3.6 One Shots 9
3.7 Function Block reads 9
3.8 Citect Cache 9
3.9 Danbuss.dbf 9
4. USER INTERFACE 11
4.1 Introduction 11
DanBuss DNIP.doc 2