
Table of Contents
Page ii Manual Documentation Number MESR9xx-0109m
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Modbus Message Buffering ..................................................................................................................................................... 27
Modbus Message Timeout ....................................................................................................................................................... 27
Modbus RTU Message ............................................................................................................................................................ 27
Modbus Serial Control .............................................................................................................................................................. 27
Modbus TCP Message ............................................................................................................................................................. 28
Model ....................................................................................................................................................................................... 28
Network Mode .......................................................................................................................................................................... 28
Network Protocols .................................................................................................................................................................... 28
Password ................................................................................................................................................................................. 28
Port# ID Remap ....................................................................................................................................................................... 29
Serial Interface Modes ............................................................................................................................................................. 29
Modbus Gateway Name ........................................................................................................................................................... 30
Gateway Serial Port Number ................................................................................................................................................... 30
Subnet Mask ............................................................................................................................................................................ 30
TCP (Transmission Control Protocol) ...................................................................................................................................... 31
5. Upgrading the Modbus Gateway Firmware .................................................................................................. 32
Downloading Firmware Files .................................................................................................................................................... 33
Uploading the Firmware to the Modbus Gateway .................................................................................................................... 33
6. Diagnostics ..................................................................................................................................................... 35
Testing a Modbus Gateway Connection .................................................................................................................................. 35
7. Application Examples ..................................................................................................................................... 37
From Serial Master to Modbus Gateway, Slave IDs Configurable ........................................................................................... 37
From Serial Masters To Ethernet Master, Slave IDs Fixed ...................................................................................................... 38
Keep Serial Master, Add Ethernet Master(s) ........................................................................................................................... 38
Modbus RTU, ASCII, and TCP Integration .............................................................................................................................. 39
8. Modbus Help ................................................................................................................................................... 40
Modbus ASCII/RTU Basics ...................................................................................................................................................... 40
Hints and Tips .......................................................................................................................................................................... 41
9. Appendices ..................................................................................................................................................... 42
Appendix A: Default Gateway Settings .................................................................................................................................... 43
Appendix B: Product Specifications ......................................................................................................................................... 44
General Specifications ................................................................................................................................................. 45
Controls, Indicators and Connector Specifications ...................................................................................................... 46
Serial Interface Specifications ..................................................................................................................................... 47
Network Specifications ................................................................................................................................................. 48
Appendix C: Dimensional Diagrams ........................................................................................................................................ 49
Appendix D: Connector Pinouts ............................................................................................................................................... 53
MESR901-x Serial Port Pinouts ................................................................................................................................... 53
MESR902D-x Serial Port Pinouts ................................................................................................................................ 55
MESR902T-x Serial Port Pinouts ................................................................................................................................. 56
Standard Ethernet Cable RJ-45 Pin-out ....................................................................................................................... 57
10. Glossary .......................................................................................................................................................... 58
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