Netiom Link Manual in PDF Format
Contents
1. The programming link is used to switch Netiom Link between active mode and programming mode In active mode Netiom Link will connect to the network and respond to ethernet messages It will not respond to any commands issued on the serial port In programming mode Netiom Link will not access the network but it will accept commands from the serial port When the link is removed all network connections will be reset Quick Start 1 Place the programming link in position 2 Connect the network to Netiom Link with an ethernet cable 3 Connect a 12 Volt d c power supply to the power terminals 4 The LED s should now be illuminated The amber LED may flicker occasionally 5 You may now want to verify the settings using the Netiom Link Interface software 6 Install and run the Netiom Link Interface Software 7 Select the PC comms port you will be using This is on the General page 8 Connect a null modem lead between the PC comms port and the Netiom Link serial port 9 Press the Read From NETIOM LINK button You can now review the settings 10 The next step will depend on your network settings If you have a DHCP server typically an ADSL router proceed from section With DHCP Server otherwise go the section Without DHCP Server With DHCP Server 11 Ensure that the following boxes are checked on the Data page Get Address Automatically Enable Client Use Broadcast Address If are not checked then ch2. both ends Is the router or hub is switch on Is the cable good and is it the correct type There are two types of ethernet cables straight through and cross over If you are connecting into a hub or router you should use a straight through type If you are connecting directly to a PC you will need to use a cross over type Problem Netiom Link will work fine on a local network but it will not work over the internet Solution Make sure that you have not set the client addressing to Use Broadcast Address at either end of the link Make sure that you have set port forwarding on both gateways to the correct port and IP address Some gateways will remember old IP addresses and their associated MAC addresses Thus the gateway may be forwarding packets using an incorrect MAC address Try resetting the gateway or changing the IP address of the Netiom Link to another address Phaedrus Limited Unit 1 Darwen Enterprise Centre Railway Road Darwen BB3 3EH U K Tel Fax 44 0 1254 772622 e mail tech phaedrusltd com Issue 1 March 2005 Appendix 1 Link Initiation 1 Client Mode with Fixed IP Address At start up an ARP Address Resolution Protocol request is issued If the request is resolved Netiom Link will know the MAC address of the target device and will know that it is present on the network A network packet will then be transmitted with the current status of the inputs This should then result in the return of a packet
3. button on the general page 21 When the download is complete remove the programming link 22 Repeat the procedure for the second module but you must use a different IP address from the one used on the first module Interface Software PC based software is provided to provide a graphical interface to programming Netiom Link On the opening page there are controls for loading and sending data and a logging area which will show a log of activity as well as any problems encountered The Data page is used to set all the necessary parameters for the Netiom Link Data Data can be written to Netiom Link or read from it via the serial port at 19200 baud Note that the programming link must be in place before communications can be established with Netiom Link The best way to use the program is to read data from Netiom Link modify it and then write it back At start up the program will load a set of defaults from the file DefaultConfig txt If you need a different set of defaults you can overwrite this file with your own values If you have several different configurations then these can be saved as separate files Before sending data to Netiom Link the data is checked for any inconsistencies and will not proceed if any are found If problems are encountered a list is written to the logging window During the write operation to Netiom Link all data is read back and compared with the data sent If there are any problems then they will be rep
4. from the target end thus establishing the link If the ARP request is not resolved then Netiom Link will wait for the Timeout period and then re issue the request This will continue until a response is returned If there is a break in the receipt of packets from the remote end of the link for the Timeout period then the link is reset and a new ARP request is issued Again this is repeated until the link is re established 2 Client Mode with Broadcast IP Address At start up a network packet is transmitted with the current input status The IP address will be 255 255 255 255 and the MAC address will be OxFFFFFFFF both defined as broadcast values The target will recognise that this is a packet from a Netiom Link and will respond using the originating IP and MAC addresses as their target addresses The originating device will receive the packet recognise that it a Netiom Link package and will now deduce the IP and MAC addresses of the remote end The next packet transmitted by the originating end will use this new information thus establishing the link 3 Non Client Mode At start up the Netiom Link will listen for packets on the assigned Port Number It will not transmit and data at this time When a packet is received it is inspected to determine if it is a Netiom Link packet If it is then it will respond to the packet with the current status of its inputs using the originating IP and MAC addresses as the target address thus establishing the
5. in the range 20mS to 20 seconds Note that it is important that both ends of the link have the same baud rate as there is limited buffering within the Netiom Links and congestion could cause data loss Watchdog The watchdog facility can be used to monitor link activity If this facility is enabled then output 1 will be activated when the link is established Note that this will then remove the functionality of Input 1 MAC Address This field shows the MAC address of the Netiom Link It is not possible to change this number and is provided for information only Pings Netiom Link will respond to network pings To ping Netiom Link from a PC use the command line ping followed by its IP address For example ping 192 168 0 6 Hardware Connections The digital inputs and outputs are available via screw terminals or 10 way headers The headers also have power pins so that auxiliary modules can be powered directly from Netiom Link Each of the headers has the same pin assignment regardless of whether they are inputs or outputs The following diagram shows the pin arrangement Digital Inputs Each digital input is connected to a CMOS gate via a 100K resistor It is pulled up to the internal 5 Volt supply rail via a 10K resistor The input can be directly interfaced to TTL and CMOS outputs The input voltage should not exceed 5 Volts In addition the inputs can use clean contacts referenced to 0 Volts or open collector outputs again re
6. NETIOM Link User Manual About This Manual This manual provides a detailed description of the operation and features of Netiom Link It assumes that the reader is familiar with network terminology and therefore does not give any detailed descriptions of networks or their operation If you are not familiar with networking then it may help to read the Network Terminology document PC based software is provided which provides a graphical interface to the programming features of Netiom Link This manual makes reference to this software in the explanations for the set up procedure It is not necessary to read the whole manual before setting up Netiom Link as it is unlikely that you will use all of its features For small networks the Quick Start section should get you up and running so that you can create a basic link If you encounter problems with the Quick Start then it likely that you have some sort of problem with network addressing If so refer to that section The Introduction and Operation section may also help with problem solving Details of how Netiom Link establishes and controls the link are in the Appendices This information is provided for those who are interested in the internal workings of the link and for a better understanding of its operation It is not necessary to read or understand to this level of detail to use the product Introduction Netiom Link is a network enabled Input Output module It is intended to
7. client mode When in client mode the Netiom Link will need to know the IP address to connect to the other end of the link Two methods are available If Use Broadcast Address is selected Netiom Link will transmit a broadcast to all devices on the network The device at the other end will recognise this message and return with a reply indicating its own IP address The originating device will then use this new IP address for further communication Note that this method is only suitable for local area networks as broadcasts are not allowed to transverse gateways The second method is to supply an IP address In this case the originating Netiom Link will establish contact directly with the other end This method must be used for wide area networks such as the internet Serial Port With the programming link in place the serial port always runs at 19200 baud In active mode you can specify the baud rate so that Netiom Link can communicate with external equipment Netiom Link can support baud rates in the range 2400 to 38400 baud Netiom Link will store incoming serial data in a 64 byte working buffer until it deems that the data string is complete Once complete or the buffer is full the data is transmitted to the remote Netiom Link You can specify either a carriage return line feed pair CR LF indicates that the data is complete or use a timed methology i e no data for a fixed period If the latter is chosen then the timeout value can be specified
8. eck them and download to Netiom Link using the Write To NETIOM LINK button on the general page 12 Remove the programming link The red LED should now flicker once or twice 13 Wait for about 5 seconds and replace the programming link 14 Read the data back from Netiom Link as before 15 The assigned IP address will now be displayed on the Server page If this reads 0 0 0 0 then the DHCP process has failed and it will be necessary to set up the IP address manually Follow the Without DHCP Server section instructions 16 Repeat the procedure for the second module Without DHCP Server 17 You will need to set up the addressing manually Uncheck the Get Address Automatically box on the Data page of the Netiom Link Interface software 18 If there are a large number of devices on your network you will need to be assigned an IP address from your network administrator If there are only a few PCs you can determine their address from a command prompt Type in ipconfig and the settings will be returned Make a note of each one and choose an address close to the ones returned changing only the fourth number For example if your network is using 192 168 0 2 and 192 168 0 5 try using 192 168 0 6 19 Enter the obtained number into the IP address boxes You should be safe using 192 168 0 1 for the gateway address and 255 255 255 0 for the Submask 20 Download the new data to Netiom Link using the Write To NETIOM LINK
9. ed as the Gateway Address You can find the settings on any local PC running Windows by going to the command prompt and typing config This will return the IP Address of the PC the Gateway Address and the Submask If you only have one PC and gateway router then use the last two values for the Gateway Address and Submask and increment the last digit of the IP Address by 1 Port Number The port number is used as part of the network interface This can be set anywhere in the range 1 to 65535 However values below 1024 should be avoided as these are generally pre allocated to well known services Both devices on a link must have the same port number otherwise they will not be able to communicate with each other If more than one pair of Netiom Links are used on a network then each pair should be allocated different port numbers Connections The connections section defines how the link is established and maintained At least one of the pair must be enabled in client mode In client mode the Netiom Link will periodically send out a network packet even if the link is not established Data will be transmitted whenever a change occurs on the inputs or when a serial message is received If there has been no change for a period defined by the Update Period then a message will be transmitted as a heartbeat If client mode is not select messages are not transmitted until the link is established Messages will then be sent in the same way as in
10. ferenced to 0 Volts If the driving modules do not share the same power supply as Netiom Link then it will be necessary to common their 0 Volt lines The inputs are scanned with a timebase of 100mS Thus the input signal must be present for 200mS in order to guarantee Netiom Link seeing it With the input high or open circuit Netiom Link will report it as a 1 otherwise it will be reported as a 0 SU 18K N namn TO CMOS INPUT air 100K Outputs Outputs are open collector and can be used to drive relays solenoid LEDs etc Optional LED and relay modules are available which plug directly into the 10 way header E Ao Lat be Note that if these outputs are to drive inductive loads such as relays and motors then the load must have some form of back EMF suppression fitted IF SUPPRESSION IS NOT FITTED THEN THE OUTPUT DEVICE WILL BE DAMAGED The following diagram shows how to interface the VIOM output to a relay SUPPLY Analogue Inputs Analogue inputs are not used with Netiom Link Hardware Accessories Display Module The display module consists of 8 LEDs which can be connected directly on to the Netiom Link controller Connection is via a ribbon cable to the output header If all 16 outputs are to be displayed then two VIOM Display modules will be required Relay Module The Relay module consists of 8 single pole change over relays which can be connected directly on to the Netiom Link controlle
11. iod expires Each packet is divided into 4 sections The first section identifies the message as originating from a Netiom Link device The second section is used for control marking as urgent non urgent etc The third section defines the current state of the inputs and is always transmitted The final section is only present if there is a serial port message and contains the data received Appendix 3 Serial Port Data It is not practicable for data to be sent over the network one character at a time Therefore Netiom Link packages the data for onward transmission As each character is received from the serial port it is placed into a 64 byte buffer When a packet is complete with either a carriage return line feed pair or a break of transmission as defined by the user it is packed into a UDP packet and transmitted If the package size reaches the buffer limit again it is packaged up and sent to the remote end Inherent in this process is a transmission latency Transmission at the remote end will not commence until reception at the local end is complete or the buffer is full Systems using the serial port must take this latency into account especially if retries and timeouts are employed Problems may also be encountered if large amounts of data is to be transmitted Netiom Link uses a strategy of acknowledgements and retries to minimise the effect of lost data packets However Netiom Link has limited storage for holding data for re
12. link If there is a break in the receipt of packets from the remote end of the link for the Timeout period then the Netiom Link will stop transmitting and revert to listening mode again Appendix 2 Data Transmission Netiom Link uses UDP User Datagram Protocol packets to transmit information across the network This is a simpler but faster protocol than TCP and more suited to this type of link While there is no change in input conditions and no serial port activity a packet is sent at the end of the user defined update period The packet is marked as non urgent so that the remote end knows that this is a regular update packet and does not need to respond until its own update period expires This heartbeat message ensures that the remote end knows that the link is still in place and that if packets are lost that outputs are still synchronised If there is a change of input conditions or a serial port message is received then Netiom Link will immediately transmit a message irrespective of the state of the update period This message will be marked as urgent and assigned a message number On receiving this message the remote end will acknowledge the packet The originating end will wait for this acknowledgement and if it is not received within a fixed period will re issue it The re issues will continue until either an acknowledgement is received or a new message is generated by another input change serial message receipt or until the update per
13. orted in the log window Setting The Address In order to function properly on a network Netiom Link needs know the following information IP Address Gateway Address Submask Netiom Link is able to collect this information automatically if the network has a DHCP server However if these addresses are obtained automatically they will be dynamic and can change with time This may cause an interruption to the link however it should be restored automatically To obtain an address automatically check the Get Address Automatically box After you download the data to Netiom Link and remove the link Netiom Link will attempt to obtain the relevant information To set up the addresses manually uncheck the Get Address Automatically box and enter the addresses in the appropriate edit boxes Each box must contain a number in the range 0 to 255 The default values are IP Address 192 168 0 6 Gateway Address 192 168 0 1 Submask 255 255 255 0 These values should be OK for small networks with only one or two computers and a gateway router If you need to change them you will need to ascertain the values from the network For local networks there are three address ranges 10 0 0 0 to 10 255 255 255 172 16 0 0 to 172 31 255 255 192 168 0 0 to 192 168 255 255 The best way to find free addresses is to log on to the gateway router as this will keep track of all the attached devices It will also show its own IP address which should be us
14. r Connection is via a ribbon cable to the output header If all 16 outputs are to be used then two Relay modules will be required Using Netiom Link on the Internet Netiom Link can work on wide area networks such as the Internet as well as local networks Dial up networks using modems are not suitable for accessing Netiom Link The local network will be connected to the Internet via a gateway This may be a computer or an ADSL router or some similar device The gateway will have two IP addresses one which it will present to the local network and one which it will present to the Internet The Internet IP address will be supplied by your ISP If you are connecting to Netiom Link via the Internet then you will need to use the Internet IP address You will also need to tell the gateway to route incoming traffic to Netiom Link This is called Port Forwarding Thus you will need to set the gateway Port Forwarding to the same port as you have defined the Port Number parameter to the Netiom Link IP address Then any port requests the gateway receives from the Internet will be forwarded to Netiom Link Troubleshooting Problem No LEDs are illuminated Solution This is likely to be a power problem Check that power is connected and that it is the correct polarity Problem The green LED is off but the red and yellow are on Solution This is an ethernet connection problem Make sure that the ethernet cable is firmly in position at
15. transmission and if an acknowledgement has not been received before another packet is ready for transmission the new packet will be transmitted and the previous pack discarded Normally this will not cause problems as the data loss is relatively rare but critical data should be checked within the receiving application
16. work in pairs across networks with the inputs of one Netiom Link being repeated on the outputs of the second Serial data received at the port of one module will be sent out the serial port of the other module Netiom Link consists of 16 Digital Inputs 16 Digital Outputs 1 Serial Port 1 Ethernet Port Three LEDs are provided which show the status of the ethernet connection A link is provided to switch between active mode and programming mode Netiom Link will work on both local networks and wide area networks such as the Internet To run Netiom Link you will need A 12 Volt d c power supply A null modem serial lead for programming An ethernet cable to connect to the network Outputs 9 to 16 Analogue Inputs Digital Inputs 9 to 16 Programming Pins Serial Port Ethernet Port FB2022 Os Outputs 1 to 8 Power Digital Inputs 1 to 8 Operation Netiom Link has 3 LEDs which indicate the status of the ethernet connection Green indicates that Netiom Link is connected to the network When it is on it indicates that the network connection is present but not necessarily that Netiom Link is communicating with the network Amber is the receive indication This is normally on and switches off when data is received In normal operation this will flicker off every few seconds as it detects normal network polling Red is the transmit indication This will switch off when data is transmitted from Netiom Link It is normally on
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