Re: [Emc-users] OT: Linux Security

It isn't that Linux isn't a target. It is. Just not as 'popular' a target. There are antivirus that can be run on Linux, but they tend to focus on PC virus, partly because Linux is used often as storage server, and scanning the users files is a reasonable thing to do. In my experience, Linux

Re: [Emc-users] OT: Linux Security

This is the same argument often heard in regards to MacOS in the late 90s and early 00s when Windows was rife with viruses. In fact the reason MacOS was more secure then and Linux is (still) secure has more to do with the CERT and the development model of Unix itself (from whence MacOS 10

Re: [Emc-users] OT: Linux Security

I have used Linux for a long time. If you don't go 'trolling' un-trusted web sites and using email on the same computer you use for EMC, there is no need to worry. Why? Linux is a 'less valuable' target for hackers than commodity windows and even Apple machines. There are also fewer of them in

Re: [Emc-users] Stepper generator

On Monday 04 April 2016 17:20:36 John Dammeyer wrote: > I'm sure you are going to have lots of fun with this. I suspect you > might be over simplifying it too. > > It's not really that important that you can generate 1 Mhz stepping > frequencies using the hardware timer on the micro-processor.

Re: [Emc-users] Stepper generator

It may be useful to consider what hostmot2 does, before deciding whether to do it the same way or differently. The command to the step generator is a velocity or frequency command (e.g., in units of 20ns is convenient for a DDS-type generator running at 50MHz and can express step rates down to

Re: [Emc-users] Stepper generator

The upper end is no problem, it come by itself then DMA was used to feed values but the lower end I had to twiddle with a bit to get frequency down. Synchronization is not by itself a problem but values are received from Linuxcnc with quite large jitter. I could add a little bit of lag and even

Re: [Emc-users] Stepper generator

Thanks a lot for this post! On 2016-04-04 23:20, John Dammeyer wrote: > I'm sure you are going to have lots of fun with this. I suspect you might > be over simplifying it too. > > It's not really that important that you can generate 1 Mhz stepping > frequencies using the hardware timer on the

Re: [Emc-users] Stepper generator

I'm sure you are going to have lots of fun with this. I suspect you might be over simplifying it too. It's not really that important that you can generate 1 Mhz stepping frequencies using the hardware timer on the micro-processor. Nowadays that's probably a first or second year college lab

Re: [Emc-users] OT: Linux Security

Then don't encrypt or select the option to allow the company to hold the key as well... > On Apr 4, 2016, at 2:51 PM, Nicklas Karlsson > wrote: > > On Mon, 4 Apr 2016 14:00:42 -0400 > Tom Easterday wrote: > >> Always good to have a local backup

[Emc-users] Stepper generator

I am currently implementing a stepper generator on micro controller which may output square waves with clock frequency accuracy with use of built in timer peripheral. It may generate square wave probably up to at least in the MHz range and be extended downwards as far as needed by some

Re: [Emc-users] OT: Linux Security

On Mon, 4 Apr 2016 14:00:42 -0400 Tom Easterday wrote: > Always good to have a local backup as well, but offsite backup is essential > if you really care about the data. With CrashPlan there is an option, I > believe, where they hold the key as well and can therefore decrypt

Re: [Emc-users] OT: Linux Security

Always good to have a local backup as well, but offsite backup is essential if you really care about the data. With CrashPlan there is an option, I believe, where they hold the key as well and can therefore decrypt data if you happen to lose the key. However, making sure you don't lose the

Re: [Emc-users] OT: Linux Security

On Monday 04 April 2016 10:43:10 Nicklas Karlsson wrote: > A backup of important files stored at other location or other place > not likely to be affected by the same misshap is always good. > > I'll second that. amanda grabs the lcnc related stuff from all of my machines, and all of this

Re: [Emc-users] OT: Linux Security

On Monday 04 April 2016 09:55:16 Rick Lair wrote: > Hello Guys, > > Is there any need for any anti-virus/malware/spyware software on my > linux machines, I have never thought about, but last week I switched > my desktop over to Mint from XP, and wasn't sure what security > measures are needed, I

Re: [Emc-users] OT: Linux Security

You certainly do not need to BUY any additional software. But you do need to set up the Linux machine reasonably. Mostly this means 1. Never use an admin login account for normal work. Set yourself up as a normal user then use "su" or whatever to do what you need. 2. use good passwords on

Re: [Emc-users] OT: Linux Security

On 04/04/2016 10:00 AM, Tom Easterday wrote: > For offsite backup I would highly recommend of CrashPlan. It works on Mac, > Win, and Linux. It allows for strong private key encryption of all data > during backup and on the servers. Recovery of files is easy and since you > are downloading

Re: [Emc-users] OT: Linux Security

On 04/04/2016 09:54 AM, Jeff Epler wrote: > > I don't think any of the common web or e-mail threats have payloads that > work on Linux anyway. But if you have an open ssh port and your root > password is "root", you will end up with unwanted software installed, > such as an IRC server to control

Re: [Emc-users] OT: Linux Security

On 04/04/2016 09:49 AM, Rick Lair wrote: > So what would you recommend on my desktop PC in my office, that I do > everything on, that I just converted over to Linux Mint? > > Is it behind a firewall? Does it use NAT, so the desktop has no WAN address? That's the best security. Use good

Re: [Emc-users] Modbus wiring

On Monday 04 April 2016 09:37:08 Nicklas Karlsson wrote: > > Maybe. OTOH, I can probably knock up something in eagle or geda/pcb, > > and carve it on my machine by the time UPS could make a drop here. > > Those pictured boards Farnell shows me are quite simple, and adding > > another thru-hole

Re: [Emc-users] OT: Linux Security

On 04/04/2016 08:55 AM, Rick Lair wrote: > Hello Guys, > > Is there any need for any anti-virus/malware/spyware software on my > linux machines, I have never thought about, but last week I switched my > desktop over to Mint from XP, and wasn't sure what security measures are > needed, I wasn't

Re: [Emc-users] OT: Linux Security

I would consider lost key quite a serious risk. I have copy of files I worked on the last months on CD/DVD or whatever they name the disks nowaday. If computer break down or does not work for other reason i install the software again. On Mon, 4 Apr 2016 11:00:35 -0400 Tom Easterday

Re: [Emc-users] OT: Linux Security

For offsite backup I would highly recommend of CrashPlan. It works on Mac, Win, and Linux. It allows for strong private key encryption of all data during backup and on the servers. Recovery of files is easy and since you are downloading it is usually quite fast assuming you have fast

Re: [Emc-users] OT: Linux Security

Here are the security measures I use on my Linux machines: * Have a back-up plan so that you can restore your computer after a problem (not limited to finding malware, but more likely problems such as a failed disk/SSD) * Firewall that allows incoming connections only on specific

Re: [Emc-users] OT: Linux Security

So what would you recommend on my desktop PC in my office, that I do everything on, that I just converted over to Linux Mint? Rick On 04/04/2016 10:43 AM, Nicklas Karlsson wrote: > A backup of important files stored at other location or other place not > likely to be affected by the same

Re: [Emc-users] OT: Linux Security

A backup of important files stored at other location or other place not likely to be affected by the same misshap is always good. On Mon, 4 Apr 2016 07:33:21 -0700 Jerry Scharf wrote: > Rick, > > The family of software you mentioned are there to try to protect you when >

Re: [Emc-users] OT: Linux Security

Rick, The family of software you mentioned are there to try to protect you when you bring new things onto the machine. Anti-virus is for finding bad programs that have been added to the machine. If you stick to only installing things that are downloaded from the debian distro and things you can

Re: [Emc-users] OT: Linux Security

For spyware I guess it depend. If you market the machined parts they could it see them in the broschure or wherever you put them anyway. On Mon, 4 Apr 2016 09:55:16 -0400 Rick Lair wrote: > Hello Guys, > > Is there any need for any anti-virus/malware/spyware software on

[Emc-users] OT: Linux Security

Hello Guys, Is there any need for any anti-virus/malware/spyware software on my linux machines, I have never thought about, but last week I switched my desktop over to Mint from XP, and wasn't sure what security measures are needed, I wasn't ever really concerned about the CNC's, but now with

Re: [Emc-users] Modbus wiring

> Maybe. OTOH, I can probably knock up something in eagle or geda/pcb, and > carve it on my machine by the time UPS could make a drop here. Those > pictured boards Farnell shows me are quite simple, and adding another > thru-hole for the supply bypassing those chips ought to have would be >

Re: [Emc-users] Modbus wiring

On Monday 04 April 2016 01:52:42 Nicklas Karlsson wrote: > > > > > ISO7421 > > > > > > > > Now thats sweet, and a heck of a lot better thought out than the > > > > last such chip I looked at a decade ago. Needs a 4 wire cable > > > > from each direction, but I don't see as that as a problem

Re: [Emc-users] Modbus wiring

Lemme clarify- whether or not you're galvanically isolating, any RS485 transceiver needs either 3-wire or 4-wire logic due to its half-duplex nature, OR to be protocol-aware. I don't know if the RTS could be used that way. RTS is hardware flow control, which is obsolete now and often not

Re: [Emc-users] Modbus wiring

> That's a bare unidirectional isolator. OK for RS232. Problem being, > Modbus is over RS422/RS485, a bidirectional protocol and there's a lot > of difficult problems in creating buffers of any sort. It doesn't know > which direction it's supposed to drive at any given time. > >

Re: [Emc-users] Modbus wiring

That's a bare unidirectional isolator. OK for RS232. Problem being, Modbus is over RS422/RS485, a bidirectional protocol and there's a lot of difficult problems in creating buffers of any sort. It doesn't know which direction it's supposed to drive at any given time.