Modbus device ID

Started by Anonymous in comp.arch.embedded12 years ago 1 reply

The company I work for is developing a controller that has three communications ports: two RS485 and one TCP. Modbus TCP and Modbus RTU...

The company I work for is developing a controller that has three communications ports: two RS485 and one TCP. Modbus TCP and Modbus RTU Master/Slave will be implemented. It has been proposed that each port have a different Modbus device ID, rather than one global ID. I contend there is no benefit to this, and only adds confusion for integrators. Does anyone know of a precedent for this?...


Re: cool article, interesting quote

Started by Spehro Pefhany in comp.arch.embedded13 years ago 9 replies

On Thu, 20 Apr 2006 20:26:38 -0700, John Larkin wrote: > At something like 14 klines and lots going on, it got a bit hairy. We > used an...

On Thu, 20 Apr 2006 20:26:38 -0700, John Larkin wrote: > At something like 14 klines and lots going on, it got a bit hairy. We > used an Xport module for the ethernet option. Once TCP/IP stacks get > involved internally, I concede the language debate. > John You could still program the parts you want to in assembly and just link in the TCP/IP, G


AVR+Nut/OS vs. AT91+Linux

Started by Randall Nortman in comp.arch.embedded14 years ago 22 replies

I need to produce an Ethernet-capable embedded device (including TCP/IP stack) for about $50 in low quantities (think perhaps qty 100). I can...

I need to produce an Ethernet-capable embedded device (including TCP/IP stack) for about $50 in low quantities (think perhaps qty 100). I can get a 2-layer board in these quantities for $13, so that leaves only about $40 for everything that goes on the board. The good news is that by far, the dominating resource consumption will be from the TCP/IP stack, and whatever OS overhead there may be...


Low cost TCP/IP platform

Started by Gavin Jacobs in comp.arch.embedded14 years ago 10 replies

I'm about to do some work with UPnP. The platform I need is described below. Any suggestions? The specs are: a) Any small embedded...

I'm about to do some work with UPnP. The platform I need is described below. Any suggestions? The specs are: a) Any small embedded microprocessor c/w a multitasking OS and a TCP/IP stack b) 10BaseT Ethernet interface c) A few discrete I/O and a 1Wire interface for the Dallas temperature sensor The development specs are: i) Any free or open source compiler (C preferred, but will consider ...


TCP/IP throughput with lwip in bf536

Started by chokka.17 in comp.arch.embedded9 years ago

hi, i'm new to bf536 vdk with lwip project. I evaluating the throughput of lwip stack. On TCP i'm getting only 5.0Mbps and On UDP i'm getting...

hi, i'm new to bf536 vdk with lwip project. I evaluating the throughput of lwip stack. On TCP i'm getting only 5.0Mbps and On UDP i'm getting only 32Mbps for 100Mbps link. Can anybody tell me what i've to do to improve the throughput. Thanks in advance Ragards Cho --------------------------------------- Posted through http://www.EmbeddedRelated.com


attempting to troubleshoot for customer

Started by Tier3 in comp.arch.embedded12 years ago

This little poor thing looks just odd. When you take a closer look, you will see that port numbers and other TCP parameters of this packet are...

This little poor thing looks just odd. When you take a closer look, you will see that port numbers and other TCP parameters of this packet are actually... constructed of what should be the packet payload! Source port and destination port, two 2-byte values that start every TCP header, are 18245 and 28261 - 0x4745, 0x5420 in network endian order. This translates to ASCII string 'GET ', a ...


Smalles Ethernet (no TCP/IP) implementation, even 10Mbps

Started by Anonymous in comp.arch.embedded7 years ago 51 replies

I have to create a small network composed by some nodes. At the moment, the number of nodes is about 10, but I want to have a flexible...

I have to create a small network composed by some nodes. At the moment, the number of nodes is about 10, but I want to have a flexible architecture that could increase in the future. I think Ethernet is a very good bus technology that solves many problems to the developer: framing, multi-master, addressing, conflicts, ... I don't need the full TCP/IP stack that needs high resources


Beginner level help required

Started by shoaibali11 in comp.arch.embedded14 years ago 2 replies

Hi everybody I am new to porting ucOS on an ARM processor so need your help please My application requires Ethernet interfacing with ARM...

Hi everybody I am new to porting ucOS on an ARM processor so need your help please My application requires Ethernet interfacing with ARM processor, so I nee ucOS with tcp/ip stack. The processor I want to use is SAMSUNG S3C4510B. even do not know where to start from as I have no knowledge of ucOS. But I can learn very quickly if somebody please guide me. What I need is: 1- ucOS with TCP/...


TCP/IP Stack For Low End Micros

Started by Ken Lee in comp.arch.embedded16 years ago 5 replies

Hi All, I've done a Google search and have gotten a few leads, but I'm wondering if anybody can suggest a TCP/IP stack for an Hitachi Tiny...

Hi All, I've done a Google search and have gotten a few leads, but I'm wondering if anybody can suggest a TCP/IP stack for an Hitachi Tiny H8 (H8/3687). Possibly an implementation on a different low end micro which could be ported would help. TIA, Ken. +====================================+ I hate junk email. Please direct any genuine email to: kenlee at hotpop.com


TCP packets : end of thre-way handshake and start of data-transmission - how to detect ?

Started by R.Wieser in comp.arch.embedded10 years ago 28 replies

Hello All, I'm (still) busy trying to write TCP/IP for an rtl8019as NIC connected to an ATMega32 controller, and seem to have hit a snag : I...

Hello All, I'm (still) busy trying to write TCP/IP for an rtl8019as NIC connected to an ATMega32 controller, and seem to have hit a snag : I cannot seem to find any information that tells me *with authority* when the three-way handshake ends and the first data-packet starts. Most info that I found describe the handshake, and than follow that up with tearing-down the connection (sending t...


TCP/IP Stacks for STR9

Started by dadams in comp.arch.embedded11 years ago 7 replies

I am working on new design on the STR9 that requires Ethernet. I have very little knowledge of Ethernet, as on previous applications we...

I am working on new design on the STR9 that requires Ethernet. I have very little knowledge of Ethernet, as on previous applications we have transmitted data (in a variety of protocol formats such as Modbus, DNP3.0) serially using RS485. We are now wanting to do this over Ethernet, and there seems to be several TCP/IP stacks available. As I only require to send and receive data I was wo...


Embedded webserver on an 8 bit MCU

Started by zalzon in comp.arch.embedded15 years ago 12 replies

Back from the grave. To advance my knowledge of embedded systems, I would like to build an embedded webserver on an 877 PIC microcontroller. ...

Back from the grave. To advance my knowledge of embedded systems, I would like to build an embedded webserver on an 877 PIC microcontroller. Nothing fancy as far as the webserver is concerned. From what I gather, i need to impliment a tcp/ip stack on the MCU and somehow hook it up to an ethernet card. For now, I've focused my efforts at learning TCP/IP in as much detail as I can. ...


TCP/IP software overhead ?

Started by Anton Erasmus in comp.arch.embedded14 years ago 13 replies

Hi, I am trying to get a feel for how much resources one needs for the TCP/IP in an embedded system for the following typical scenario: The...

Hi, I am trying to get a feel for how much resources one needs for the TCP/IP in an embedded system for the following typical scenario: The embeded system is connected to a busy fileserver type LAN. (10Mb/s or 100Mb/s). The embedded system only communicates on an add hock bases. i.e. a few hundred bytes every couple of seconds. (Telnet type interface), unless code is being uploaded, or ...


porting tcp/ip stack from one rtos to another

Started by elitekatti in comp.arch.embedded12 years ago 5 replies

Very new to the concept of porting code across RTOS'es. Now i need to port the tcp/ip code from one RTOS to another. Need suggestions as to how...

Very new to the concept of porting code across RTOS'es. Now i need to port the tcp/ip code from one RTOS to another. Need suggestions as to how can i start with this??


MC9S12NE64

Started by Johnny Karlsson in comp.arch.embedded14 years ago 21 replies

Hi, I'm using the MC9S12NE64 with the Freescale version of OpenTCP and I'm having some problems the the tcp/ip-stack. It sometimes doesn't ACK...

Hi, I'm using the MC9S12NE64 with the Freescale version of OpenTCP and I'm having some problems the the tcp/ip-stack. It sometimes doesn't ACK received data packets, which results in retransmissions. The problem doesen't seem to be related to high volume traffic all, tough the problem becomes more acute when a lot of data is being received and transmitted. Is someone using this tcp/ip-stack a...


Reliable freeware (RTOS and TCP/IP) for ARM7

Started by in comp.arch.embedded12 years ago 10 replies

Hello all, We are looking for very reliable freeware for the ARM7 microcontroller (NXP). The target application is for proffesional use which...

Hello all, We are looking for very reliable freeware for the ARM7 microcontroller (NXP). The target application is for proffesional use which sets high requirements for reliability. The product is very cost-sensitive which has made us looking for freeware alternatives to the commercial/proffessional RTOS and TCP/IP stacks. We are currently considering: http://www.sics.se/~adam/uip...


Rabbit 4k and ethernet

Started by Anonymous in comp.arch.embedded12 years ago 7 replies

Hi experts, We have to design a special device....to implement a special protocol on top of ethernet. Rabbit 4k devices look like a good...

Hi experts, We have to design a special device....to implement a special protocol on top of ethernet. Rabbit 4k devices look like a good choice, but it comes with TCP/IP stack built in. How easy it is in Rabbit 4K to get rid of the the TCP/IP stack from OS and take charge of packets arriving over ethernet. I am aware of NE2000 compatibility. Please let me know whether it will be helpf...


high bandwitch ethernet communication

Started by eliben in comp.arch.embedded12 years ago 30 replies

Hello, In our application we have to receive and merge several proprietary serial channels (200 MHz) over fibers, and send all the data...

Hello, In our application we have to receive and merge several proprietary serial channels (200 MHz) over fibers, and send all the data over Gigabit Ethernet. The bandwidth is ~60 MByte/s, sustained. While generally sending this amount of data is possible over Gbit Ethernet, doing so in an embedded system isn't easy. That's because we need to send it by UDP or TCP, for which a TCP/UDP/IP...


testing TCP stack - teardrop & co

Started by Markus Zingg in comp.arch.embedded15 years ago 2 replies

Hi group I'm in the process of testing the robustness and if needed improof my embedded TCP/IP stack implementation. I performed already many...

Hi group I'm in the process of testing the robustness and if needed improof my embedded TCP/IP stack implementation. I performed already many kind of (mostly stress) tests etc, but testing attacks is not so easy as I first thought. It turns out that getting "malware" which I would like to "use" to simulate all kind of attacks is (somehow fortunately) not so easy. I managed to get a tool to...


OT: How much traffic does your ISP filter by TCP port no.?

Started by Didi in comp.arch.embedded12 years ago 1 reply

A few days ago my ISP blocked my outgoing TCP connections to port 25 - except to their mailserver. After a few calls they agreed to let me also...

A few days ago my ISP blocked my outgoing TCP connections to port 25 - except to their mailserver. After a few calls they agreed to let me also access my domains mailserver (turned out they just allowed it globally to all their customers...). I sometimes use my domains mailserver or my ISP's, but at times, e.g. when I want to have the delivery session to the final recipient mailserver log...