Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2020 ICP DAS CO., Ltd. All Rights Reserved. - 4 -
6.2 MODBUS NET ID.............................................................................................................................................................. - 75 -
6.3 PAIR-CONNECTION APPLICATIONS .................................................................................................................................. - 76 -
6.4 TCP CLIENT MODE APPLICATIONS ................................................................................................................................. - 84 -
7. MODBUS INFORMATION ...................................................................................................................................................- 89 -
7.1 MODBUS MESSAGE STRUCTURE ...................................................................................................................................... - 89 -
01(0x01) Read the Status of the Coils (Readback DOs)
............................................................................................................- 92 -
02(0x02) Read the Status of the Input (Read DIs)
...................................................................................................................- 93 -
03(0x03) Read the Holding Registers (Readback AOs)
............................................................................................................- 94 -
04(0x04) Read the Input Registers (Read AIs)
.........................................................................................................................- 95 -
05(0x05) Force a Single Coil (Write DO)
..................................................................................................................................- 96 -
06(0x06) Preset a Single Register (Wr ite AO)
..........................................................................................................................- 97 -
15(0x0F) Force Multiple Coils (Wr ite DOs)
...............................................................................................................................- 98 -
16(0x10) Preset Multiple Registers (Write AOs) ..............................................................................................................- 99 -
7.2 EXCEPTION CODES............................................................................................................................................................ - 100 -
APPENDIX A: TROUBLESHOOTING........................................................................................................................................- 102 -
A1. HOW DO I RESTORE THE WEB PASSWORD FOR THE MODULE TO THE FACTORY DEFAULT PASSWORD? ............................................... - 102 -
APPENDIX B: GLOSSARY ............................................................................................................................................................- 104 -
1. ARP (ADDRESS RESOLUTION PROTOCOL)............................................................................................................... - 104 -
2. CLIENTS AND SERVERS.................................................................................................................................................. - 104 -
3. ETHERNET ......................................................................................................................................................................... - 105 -
4. FIRMWARE......................................................................................................................................................................... - 105 -
5. GATEWAY........................................................................................................................................................................... - 105 -
6. ICMP (INTERNET CONTROL MESSAGE PROTOCOL) ............................................................................................... - 105 -
7. INTERNET........................................................................................................................................................................... - 105 -
8. IP (INTERNET PROTOCOL) ADDRESS .......................................................................................................................... - 106 -
9. MAC (MEDIA ACCESS CONTROL) ADDRESS ............................................................................................................ - 106 -
10. PACKET ........................................................................................................................................................................ - 106 -
11. PING .............................................................................................................................................................................. - 106 -
12. RARP (REVERSE ADDRESS RESOLUTION PROTOCOL).................................................................................... - 106 -
13. SOCKET ........................................................................................................................................................................ - 107 -
14. SUBNET MASK ............................................................................................................................................................ - 107 -
15. TCP (TRANSMISSION CONTROL PROTOCOL) ...................................................................................................... - 107 -
16. TCP/IP ......................................................................................................................................................................... - 107 -
17. UDP (USER DATAGRAM PROTOCOL) .................................................................................................................... - 107 -
APPENDIX C: ACTUAL BAUD RATE MEASUREMENT........................................................................................................- 108 -
APPENDIX D: REVISION HISTORY..........................................................................................................................................- 109 -