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Lantronix XPort APS: Modbus Protocol User Guide - Page 6

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1: Introduction This protocol manual is for use with Lantronix Industrial Automation Protocol (IAP) Device Servers, such as the XPress DR-IAP, UDS1100-IAP, and xDirect-IAP. In addition to our IAP Device Servers, the Modbus protocol is supported on various embedded products including versions of the XPort, WiPort, xPico, and Micro/Micro125. The default protocol in new IAP Device Servers is the Standard Tunneling protocol, a serial protocol used to connect thousands of intelligent devices to the Ethernet. The user guide for your IAP Device Server provides detailed information for installing and operating the IAP Device Server using Standard Tunnel protocol. Changing that protocol to one of the industrial protocols changes the configuration menus and dialogs. This User Guide provides Modbus™ protocol-specific information for the embedded and external products listed above. Modbus Protocol User Guide 6

Section	Page
Modbus Protocol User Guide	1
Copyright and Trademark	2
Contacts	2
Disclaimer	2
Revision History	2
Table of Contents	3
Figures	5
Tables	5
1: Introduction	6
2: Modbus	7
Extended Modbus System Example	7
Modbus/TCP Master Talking to Modbus/TCP Slave	8
Modbus/TCP Master Talking to Modbus/RTU Serial Slave	8
Modbus/RTU Serial Master Talking to Modbus/TCP Slave	8
Modbus/RTU Serial Master Talking to Modbus/RTU Serial Slave	8
3: Configuring Modbus	9
Network Protocols	9
Packing Algorithm	9
IP Address	9
Configuration Methods	9
IAP Device Server’s IP Address	10
Using the Setup Mode Screen	10
Basic Commands (D/S/Q)	11
Default Settings (D)	11
Save (S)	11
Quit Without Saving (Q)	11
Network/IP Settings	12
IP Address	12
Set Gateway IP Address (Y/N)	12
Set Netmask (N for default)	12
Telnet Configuration Password	12
Serial and Mode Settings	12
Attached Device (1=Slave, 2=Master)	12
Serial Protocol (1=Modbus/RTU, 2=Modbus/ASCII)	12
Interface Type (1=RS232 2=RS422/RS485+4-wire 3=RS485+2-wire)	13
Enter Serial Parameters (B,D,P,S)	13
Modem Control Settings	13
RTS/CTS Mode (1=Fixed 2=Variable)	13
Delay after Output of RTS (0-1275 ms, 5ms increments)	13
Wait for CTS to Go Active (N/Y)	13
Delay after CTS Going Active (0-1275 ms, 5ms increments)	14
Delay Dropping RTS after Transmitting (0-1275 ms, 5 ms increments)	14
Advanced Modbus Protocol Settings	14
Slave Address (0 for auto, or 1…255 fixed otherwise)	14
Allow Modbus Broadcasts (1=Yes 2=No)	14
Use MB/TCP 0x0B/0x0A Exception Responses (1=No 2=Yes)	14
Disable Modbus/TCP pipeline (1=No 2=Yes)	15
Character Timeout (10-7050 msec)	15
Message Timeout (200-65000 msec)	15
Serial TX delay after RX (0-1275 msec) (0)	15
Swap 4x/0x to get 3x//x (1y)	16
Unit ID to IP Address Lookup Table	16
Close Idle TCP sockets after (3-60 sec, 0=leave open)	17
Redundant Entry Retries after (15-60 sec. 0=disable feature)	17
A)dd, D)elete, E)xit Select Function	17
Modbus Address From/To	17
Slave IP Address	17
Security Settings	17
SNMP	18
SNMP community	18
Telnet Setup	18
TFTP Download	18
Port 77FEh	18
Web Server	19
Enable Enhanced Password	19
Port 77F0 (Hex)	19
Default Security Settings	19
4: Monitor Mode and Firmware	20
5: WiPort and WiBox Implementation	21
6: XPort Implementation	24
7: xPico Implementation	25
8: Micro125 Implementation	27
9: Factory Defaults with Reset Pin/Default Pin	28
xPico Factory Defaults	28
xDirect Factory Defaults	28
Micro125 Factory Defaults	28
10: Troubleshooting and Technical Support	29
How fast can I poll?	29
I cannot get a slave response	30
Only Slave ID #1 can be polled	31
Every 2nd poll seems to fail	31

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Modbus Protocol User Guide

1: Introduction

This protocol manual is for use with Lantronix Industrial Automation Protocol (IAP) Device

Servers, such as the XPress DR-IAP, UDS1100-IAP, and xDirect-IAP. In addition to our IAP

Device Servers, the Modbus protocol is supported on various embedded products including

versions of the XPort, WiPort, xPico, and Micro/Micro125. The default protocol in new IAP Device

Servers is the Standard Tunneling protocol, a serial protocol used to connect thousands of

intelligent devices to the Ethernet. The user guide for your IAP Device Server provides detailed

information for installing and operating the IAP Device Server using Standard Tunnel protocol.

Changing that protocol to one of the industrial protocols changes the configuration menus and

dialogs.

This User Guide provides Modbus™ protocol-specific information for the embedded and external

products listed above.