ICP DAS USA tGw-735

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Tiny Modbus/TCP to RTU/ASCII Gateway

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 -

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