PMDX-122 and G-251, good combo given lack of optoisolation?

[debetto]

I recently purchased a PMDX-122 BOB for my 4 G-251's. Both lack optoisolation, and I am not sure if the combo is a good idea.

Thoughts?

Debetto

[jalessi]

Debetto,

The PMDX-122 is buffered, so you dont need to worry.

This is posted on the PMDX.COM website

The PMDX-122 is a motion control breakout board for interfacing with the parallel port of an IBM-PC style computer

+Supports all signals present on a standard printer port. (8 data, 5 input, 4 output)

+Allows the 8 bit data port to be used as outputs (step/dir/etc) or as 8 input bits.

+Great for second parallel port usage when using encoders or lots of feedback signals.

+Buffers signals to protect the PC's printer port.

+Utilizes standard IEEE-1284 Centronics style printer cable for connection to PC.

+Connection to PC can also be via a 26 pin ribbon cable which allows a remote DB-25 to be used.

+Provides LED status indicators on all 8 data port signals, 5 input and 4 output signals.

+Supports the MACH "charge pump" signal to inhibit outputs when the MACH software is not running.

+The "charge pump" function can be daisy chained between boards

+Inhibits outputs when E-Stop or Fault inputs are asserted.

+Reports E-Stop to computer on loss of power, E-Stop loop open, Fault input grounded, or printer cable disconnected

+Provides one 10 Amp. relay on board for spindle or other I/O output function.

+Inputs have pull-ups to +5 volts and are filtered to suppress noise.

+Step and direction outputs from data bits can be common ground or common +5 volts for driving opto inputs.

+All I/O connections are made via wire clamp screw terminal strips.

+Auxiliary +5 volt DC output available to power sensors.

+Three power supply options. (external DC, external AC, or USB port power steal)

+LED to indicate "outputs enabled" status so "charge pump" status can be seen.

+Jumpers to control "charge pump" functionality, E-Stop behavior, and data port direction


The PMDX-122 and G251 combo will work fine.

Jeff...

[debetto]

Thanks for the reply! I wanted to make sure didnt zap my computer.