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HOME_OFFSET is the location of the home switch.
Where is your z home switch located in relation to the top of Z travel?


Override Limits on the SETTINGS tab should allow you to jog after hitting a limit.
 

Ok, I should have been more detailed. The connections are:

hm2_5i25 < sslbp > < TTL-RS485 > 7i87

I'm using the TTL to RS485 translator the MESA told me to use. It and the 7i87 card have power but I don't know if the signal is getting through.

3: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether a4:1f:72:67:47:1f brd ff:ff:ff:ff:ff:ff
inet 10.10.10.100/8 brd 10.255.255.255 scope global enp5s0
valid_lft forever preferred_lft forever

Note that this overlaps your other address:

2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:e0:4c:68:0e:4f brd ff:ff:ff:ff:ff:ff
inet 10.0.0.5/24 brd 10.0.0.255 scope global dynamic noprefixroute enp4s0
valid_lft 84042sec preferred_lft 84042sec
inet6 fe80::2e0:4cff:fe68:e4f/64 scope link noprefixroute
valid_lft forever preferred_lft forever

Allowing a normal internet packet to get routed out of the real time interface
Not sure that would cause your issues but you might try setting enp5s0's netmask
to /24 (so 10.10.10.255) rather than /8 (10.255.255.255)
 

Ich hab jetzt alles mal probiert .
Es funktioniert nichts !
Jeder Pin (fault,Error,enable ... ) muß schon auf True stehen,wenn ich den Powerbutton drücke,sonst gibt es eine Fehlermeldung .

Entweder muß ich den Powerbutton auf einen anderen Pin umbiegen oder nen externen Taster verwenden ,den Rest dann mit Classicladder
Eventuell wäre das ne Idee für ein Zusatzfeature

it reports the same as before. i don't know what the deal with that computer is. linuxcnc runs flawlessly on the duo-core laptop and i think thats what i am gong to use for now. i have been messing with this computer for a month at least trying to get linuxcnc working on it and it just doesn't want to work. for whatever reason. i gonna just use the laptop and that will be its only job, running linuxcnc, which it does very well. i just want to start using my machine, and the longer i mess with that desktop, its time i am not milling. i appreciate all your help. ill put it on the back burner for now and maybe i will visit it again in the futrure. thank you very much for you knowledge and patients. i WILL need your expertise again.

You need a RS-422 interface with the correct pinout and polarity
between the 5I25 and 7I87. That's why I asked about the
daughtercard you are using.

Its supposed to be:

hm2_5i25 < sslbp > 7i87

forum.linuxcnc.org/30-cnc-machines/31792...-01-retrofit?start=0

If you successfully built software that incorporates stepgen index
you should have a stepgen index enable pin for each stepgen.
This is the pin you must use (rather than the encoder index enable pin)
if you are homing to index on a step/dir system  without encoder
feedback to LinuxCNC.

I replaced my section 12 with the code you suggest and linuxcnc aborts with:

./vc-p4s.hal:109: Pin 'parport.0.pin-01-out' was already linked to signal 'spindle-on'

So I commented this line out in the main hal:

#net spindle-on => parport.0.pin-01-out

and that fixes the error, but the spindle still does not operate.

Can I ask a basic question? If this section of src/emc/motion/command.c is reached (which it is) shouldn't the spindle turn on?

case EMCMOT_SPINDLE_ON:

rtapi_print_msg(RTAPI_MSG_DBG, "SPINDLE_ON: spindle %d/%d speed %d\n",
emcmotCommand->spindle, emcmotConfig->numSpindles, (int) emcmotCommand->vel);
spindle_num = emcmotCommand->spindle;
if (spindle_num >= emcmotConfig->numSpindles){
reportError(_("Attempt to start non-existent spindle"));
emcmotStatus->commandStatus = EMCMOT_COMMAND_INVALID_COMMAND;
break;
}

...

What does "ip a" report now?
 

Normally, yes.

If the drives have PUL+ and PUL- you can
wire the outputs (assuming channel 4):

Drive 1

PUL+ -->  7I96S STEP4+
PUL- --> 7I96S GND
DIR+ --> 7I96S DIR4+
DIR-  --> 7I96S GND

Drive 2

PUL+ -->  7I96S +5V
PUL- --> 7I96S STEP4-
DIR+ --> 7I96S +5V
DIR-  --> 7I96S DIR4-

So you do not double the loading
on the 7I96S step/dir outputs

What daughtercard do you use?
Maybe an interface/pinout/polarity issue

I have a project with two stepper motors driving a single axis.  The motors are connected to the axis hub with T5 16mm belts.  So they should almost never fall out of step with each other.

The robot is 5-DOF but has six motors and I would like to keep all the steppers on the Mesa card.  With a Mesa 7i96S can I drive two stepper drivers, in parralell, from a single step/gen output? 

 

You can look at the SSI section of the hostmot2 manual page
man hostmot2

Also I think tommylight has some example SSI configurations