Troubles to get started with SD240 Retrofit

No unfortunately a new Config with a MPG already included did not do the trick.
Manual jogging the X and Z axes works, continuos and inkremental but not with the encoder I intend to use as MPG.
I once again ran the suggested command "halcmd show pin | grep jog" - report attached.
Did not imagine it would be this challenging to get a MPG connected...
Sigi

 

Again, the jog enables are false so the jog counts are ignored.
The jog enables are false because they are not connected to any
source (no hal "out" pin)

note that halui.axis.x.select and halui.axis.z.select pins are hal "in"
pins so can not enable anything.

What do you do to select an axis for jogging?
This part seems to be missing

That is, these need an additional connection
from whatever selects an axis for jogging:

net axis-select-x halui.axis.x.select
net axis-select-z halui.axis.z.select

Following is a hal netlisting for the MPG part of your question:

# Set jog-vel-mode to false (joint will move exactly jog-scale units for each count)
setp joint.0.jog-vel-mode 0
setp joint.2.jog-vel-mode 0
setp axis.x.jog-vel-mode 0
setp axis.z.jog-vel-mode 0

# Set jog scale 
setp mpg-scale 1.0
net  mpg-scale joint.0.jog-scale axis.x.jog-scale 
net  mpg-scale joint.2.jog-scale axis.z.jog-scale 

# Joint selection (enable only one at a time)
net mpg-select-x joint.0.jog-enable axis.x.jog-enable <= hm2_7ixx.your selector switch input
net mpg-select-z joint.2.jog-enable axis.z.jog-enable <= hm2_7ixx.your selector switch input

# Connect encoder counts to all joints (only enabled one will move)
net mpg-counts  hm2_7ixx.your mpg encoder address
net mpg=counts  joint.0.jog-counts  axis.x.jog-counts
net mpg-counts  joint.2.jog-counts  axis.z.jog-counts

Oh, damned... Thank you for the brief explanation.
The root of all the trouble seems I understood this totally wrong.
I thought "selected axis" and also the "increment" was taken from the AXIS screen- both can be chosen there 
Sorry for my sillyness. Now I understood that I need to connect the MPG in the HAL via in/outputs.

Thank you both of you

​​​​​​​Sigi
 

In this thread it was asked how to link parport signals to axis: forum.linuxcnc.org/21-axis/31791-how-to-...l-signal-to-axis-jog
and an example was given. 
Wouldn´t it be possible to link the AXIS screen status to the MPG signal  too? - so the other way round..
In other words use the selection chosen in AXIS of the axis and increment and link them to the jog mode, so that except the encoder no external elements for the axes and increment selection are necessary?
Might not make sense for a mill where you want a kind of remote control, but for a small lathe it would be convinient...

So I found the AXIS Gui document and if I apply the pins described there to your MPG code, it should be about this

# Set jog-vel-mode to false (joint will move exactly jog-scale units for each count)
setp joint.0.jog-vel-mode 0
setp joint.1.jog-vel-mode 0
setp axis.x.jog-vel-mode 0
setp axis.z.jog-vel-mode 0

# Set jog scale 
setp mpg-scale 1.0
net  mpg-scale joint.0.jog-scale axis.x.jog-scale <= halui.axis.selected.increment
net  mpg-scale joint.1.jog-scale axis.z.jog-scale <= halui.axis.selected.increment

# Joint selection (enable only one at a time)
net mpg-select-x joint.0.jog-enable axis.x.jog-enable <= halui.axis.selected.0
net mpg-select-z joint.1.jog-enable axis.z.jog-enable <= halui.axis.selected.1

# Connect encoder counts to all joints (only enabled one will move)
net mpg-counts  <=  hm2_7i80.0.encoder.03.count
net mpg=counts  joint.0.jog-counts  axis.x.jog-counts
net mpg-counts  joint.1.jog-counts  axis.z.jog-counts

Is this how it could work to use the AXIS-GUI pins instead of an axis and a increment selctor switches?

Sigi