Basler Electric BE1-700 Modbus Protocol - Manual (Page 9)

9376700991 Rev D BE1-700 Modbus™ Protocol i
SECTION 1 • GENERAL INFORMATION
TABLE OF CONTENTS
SECTION 1 • GENERAL INFORMATION ................................................................................................ 1-1
Introduction ............................................................................................................................................ 1-1
Message Structure ............................................................................................................................. 1-1
Modbus™ Modes of Operation ............................................................................................................... 1-2
Modbus™ RTU .................................................................................................................................... 1-2
Modbus/TCP ...................................................................................................................................... 1-3
Communications Hardware Requirements .......................................................................................... 1-10
RTU Communication Requirements ................................................................................................ 1-10
TCP Communication Requirements ................................................................................................. 1-10
Detailed Message Query and Response ............................................................................................. 1-10
Read Holding Registers ................................................................................................................... 1-10
Return Query Data ........................................................................................................................... 1-11
Restart Communications Option ...................................................................................................... 1-11
Listen Only Mode ............................................................................................................................. 1-11
Preset Multiple Registers ................................................................................................................. 1-12
Preset Single Register (Write Single Holding Register) ................................................................... 1-13
Data Formats ....................................................................................................................................... 1-13
Floating Point Data Format (FP) ...................................................................................................... 1-13
Long Integer Data Format (LI) .......................................................................................................... 1-14
Integer Data Format (INT) ................................................................................................................ 1-14
Short Integer Data Format (SI) ......................................................................................................... 1-14
ASCII String Data Format (ASC(x)) ................................................................................................. 1-14
Bit Mapped Data Format (BM(x)) ..................................................................................................... 1-15
CRC Error Check ............................................................................................................................. 1-15
Session Access Registers ................................................................................................................ 1-15
Template Registers .......................................................................................................................... 1-16
Fault Summary Registers ................................................................................................................. 1-16
Report Generation Registers ........................................................................................................... 1-17
Contiguous Poll Block Registers ...................................................................................................... 1-17
Exception Code Enhancement Registers ........................................................................................ 1-17
Figures
Figure 1-1. Basler Modbus/TCP Device Discovery Screen ...................................................................... 1-4
Figure 1-2. DOS Configuration Utility Screen - Login ................................................................................ 1-4
Figure 1-3. DOS Configuration Utility Screen - Password ......................................................................... 1-5
Figure 1-4. DOS Configuration Utility Screen – Enable DHCP Client ....................................................... 1-5
Figure 1-5. DOS Configuration Utility Screen – Don’t Enable DHCP Client ............................................. 1-6
Figure 1-6. DOS Configuration Utility Screen – Enter IP Address ............................................................ 1-6
Figure 1-7. DOS Configuration Utility Screen – Enter Subnet Mask ......................................................... 1-6
Figure 1-8. DOS Configuration Utility Screen – Enter Default Gateway ................................................... 1-7
Figure 1-9. DOS Configuration Utility Screen – Return to Main Menu ...................................................... 1-7
Figure 1-10. DOS Configuration Utility Screen – Enable DHCP Client ..................................................... 1-8
Figure 1-11. DOS Command Shell ............................................................................................................ 1-9
Figure 1-12. DOS Command Example with DHCP Server ....................................................................... 1-9
Figure 1-13. DOS Command Example without DHCP Server .................................................................. 1-9
Figure 1-14. DOS Command Example of Default IP Address Detected ................................................. 1-10
Tables
Table 1-1. Timing Considerations .............................................................................................................. 1-3
Table 1-2. Supported Exception Response Codes ................................................................................... 1-3
Table 1-3. Floating Point Format ............................................................................................................. 1-13