Cooper Bussmann BU-945U-E 802.11 DSSS user manual Modbus TCP Configuration on I/O Transfer Menu

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Cooper Bussmann Wireless Ethernet & Device Server BU-945U-E 802.11 DSSS User Manual

Three “Modbus TCP Client Mappings” are also configured at B in order to perform the required I/O transfer. The first mapping transfers the status of the onboard digital input at C to the onboard digital output at B. Local Register 4320 specifies the register for the onboard digital output at B (since B is the local unit at which the mapping is configured). I/O Count 1 specifies that only one I/O point is being transferred (i.e., the single digital I/O). Function Code 02: Read Discretes specifies the standard Modbus function code to read discrete (i.e., digital) inputs. Destination Register 4300 specifies the register for the onboard digital input at unit C (since C is the destination unit for this mapping). Device ID 1is the ID of the onboard Modbus TCP Server at C. Server IP Address 192.168.0.200 is the IP address of unit C – which is the Modbus TCP Server we are reading from. Response Timeout 1000 ms specifies that unit C must respond to this message within 1000ms. Comm Fail Register 0 specifies the local register where the communications status for this mapping will be stored.

The second mapping reads 8 registers from serial unit D into onboard registers in unit B. Note that in this case the specified Device ID 6 is the Modbus Address of the serial device D, while the Server IP Address 192.168.0.200 is the IP Address of unit C since the Modbus TCP to RTU Gateway at unit C converts the Modbus TCP message to Modbus RTU and routes it out the serial port to unit D.

The third mapping takes the 8 registers read by the second mapping and writes them to the serial unit A. The specified Device ID 5 is the Modbus Address of the serial device A, and the Server IP Address 192.168.0.196 is the IP Address of the local unit B since the local Modbus TCP to RTU Gateway is to route the message out the serial port to unit A.

Since the BU-945U-E supports Modbus TCP Client and Server simultaneously, the Modbus TCP Server for unit B above could also be enabled. This would allow one (or more) external Modbus TCP Clients anywhere on the extended wired or wireless network to connect to unit B and monitor the status of the I/O registers – including the I/O at units A, C, and D. This is a very powerful and flexible feature which could, for example, be exploited by a central monitoring facility or SCADA.

Modbus TCP Configuration on I/O Transfer Menu:

Enable Modbus TCP Server (Slave)

Check this box to enable the onboard Modbus TCP Server. All Modbus TCP connections to the

 

module IP Address and specified Modbus Server Device ID will be routed to the onboard I/O

 

registers.

Modbus Server Device ID

Specify the Modbus Device ID for the onboard Modbus TCP Server. Allowed values are 0 to 255.

Enable Modbus TCP Client (Master)

Check this box to enable the onboard Modbus TCP Client. I/O to be transferred via the Modbus TCP

 

client is specified with Modbus TCP Client Mappings.

Modbus Client Scan Rate

Enter the delay (in milliseconds) between execution of consecutive Modbus TCP Client Mappings

 

to the same Server.

Reset Registers on Comm’s Fail

When Enabled the value in any onboard I/O register will be reset to zero if a valid Modbus

 

transaction directed to/from the given register has not been completed for longer than the

 

Comms Fail Timeout.

Comms Fail Timeout

The period of time after which onboard I/O registers will be reset if a valid Modbus transaction

 

directed at that register has not completed.

Enable Modbus Statistics

Enables the Modbus Diagnostic registers as shown in Section 4.4 “Internal Diagnostic Modbus

 

Registers” Disabling this option will free up the registers and also slightly increase processing

 

resources.

Log background Noise

RSSI & BGND on Rx messages are made available in the diagnostic registers (See 4.4 “Internal

 

Diagnostic Modbus Registers” for details. For a Hex value of 5F5D the 5D byte = RSSI and the

 

5F byte = BGND (Convert value from hex to dec and add a “-“e.g., 5F = -95dB). Enabling this

 

option removes the RSSI byte from these registers and so only the Background Noise value is

 

made available.

3A1582Rev1.6

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Contents Read Retain Cooper Bussmann Application Engineering FCC NoticePhone 800 a.m 500 p.m. Central, M-F 636 Fax 636 Important Notice GNU Free Documentation LicenseCooper Bussmann Contents BU-945U-E 802.11 630mW max power Access Point vs ClientNetwork Topology 3A1582Rev1.6 Bridge vs. Router Getting Started Quickly General Antenna InstallationAntennas Bench test and Demo System SetupPlant and Factory Installations Line-of-sight installationsOmni-directional Antennas Installation tipsRS232 Serial Port Power SupplySerial Connections Directional AntennasRS485 Serial Port DB9 Connector Pinouts3A1582Rev1.6 Discrete Digital Input/Output Start-up Selecting a Channel LED Indication802.11 900 MHz Channels 3A1582Rev1.6 Data Throughput Based on Repeater Hops Radio ThroughputConfiguring the Unit for the First Time Default ConfigurationAccessing Configuration for the First Time For local addresses Power up the BU-945U-E moduleEnter the username user and default password user Method 1 Set PC to same network as BU-945U-E3A1582Rev1.6 Quick Start Quick Start ConfigurationNetwork Configuration Save Changes and Reset Dhcp Server Configuration, Default is uncheckedWireless ports will have the same IP address Configured Essid of the clientEncryption keys must not be all zeros, i.e Security Menu3A1582Rev1.6 Router Operation Radio ConfigurationNormal Operation Transparent Bridge OperationAccess point Bands Default is AutoSignal quality, etc Drop back to non-bursting modeChannel Selection Dhcp Client ConfigurationRadio Mode BU-945U-E Only Supports the 802.11 Standard Default distance is 20kmDhcp Server Configuration DNS Server ConfigurationSpanning Tree Algorithm / Redundancy Multiple AP Repeater Mesh Network 3A1582Rev1.6 Site B WDS Configuration Example Extending range using WDSExample Adding Redundancy Example Roaming with WDS Access Points3A1582Rev1.6 Example WDS Routed Network Mouse, to highlight the entire row Routing Rules WDS ConnectionsSTP Wireless Message Filtering Specifies a destination hostInformation at a later time 3A1582Rev1.6 MAC Address Filter Configuration IP Address Filter ConfigurationUtilize the radio link. All other devices are blocked ARP Filter Configuration RS-232 PPP Server Serial Port ConfigurationSerial Gateway Modbus Modbus RTU to TCP Serial Gateway Server/Client/MulticastSerial Menu Modbus TCP to RTU GatewayMulticast Pipe Manager To be the same on all communicating Multicast devices Digital Input/OutputPort on the Client, i.e., Scada, DCS, etc Multicast Group IP AddressModbus I/O Transfer 3A1582Rev1.6 Modbus TCP Configuration on I/O Transfer Menu Module Information Configuration Modbus TCP Client Mappings on I/O Transfer MenuModule Information Webpage Fields System Tools Remote ConfigurationConfiguration Examples Setting a BU-945U-E to Factory Default SettingsExtending a Wired Network Client 1 Configuration Client 2 ConfigurationLAN B Configuration Access Point Configuration Client ConfigurationExtending Range of a Network with a Repeater Hop RED Continuously Diagnostics ChartBoot Status LED Indication during Start-up LED Indicator Condition MeaningSite Survey Diagnostic Information AvailableConnectivity Connectivity ParametersNetwork Traffic Analysis Statistics5014 STA Only Internal Diagnostic Modbus Registers9999 Both Reset module enter Ffff to reset module Connection InformationStatistic Registers Testing Radio Paths UtilitiesPing 3A1582Rev1.6 Arp IpconfigRoute Serial Ports Power SupplyGeneral Radio TransceiverInput / Output status System ParametersAppendix a Firmware Upgrades Web-Based UpgradeDhcp ACKCSMA/CA CSMA/CDIeee IPX-SPXISN SSL SNRNAT NICWEP VoIPVPN WANDBm to mW Conversion Installation MaterialsIperf Applications 3A1582Rev1.6 JPerf Application 3A1582Rev1.6 Terms and Conditions Preamble3A1582Rev1.6 No Warranty 3A1582Rev1.6 Customer Assistance
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