Out of inputs
01 May 2024 12:27 #299452
by COlger81
Out of inputs was created by COlger81
I have a 7i92m, 7i77, and a 7i72. All 32 inputs are in use and i need 3 more digital inputs. The smart serial rs422 port on the 7i77 is used by the 7i72. What is the best way to achieve this?
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01 May 2024 13:00 #299457
by tommylight
Replied by tommylight on topic Out of inputs
IDC26 connector on 7i92 has 17 more IO, but those are very sensitive so care must be taken for wiring and signal shaping.
Using voltage dividers (simple 2 resistor thingy) you can use those for anything you need.
Or get a cheap BOB and IDC26-DB25 connector, but that limits to only 5 inputs.
Using voltage dividers (simple 2 resistor thingy) you can use those for anything you need.
Or get a cheap BOB and IDC26-DB25 connector, but that limits to only 5 inputs.
The following user(s) said Thank You: cornholio
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01 May 2024 13:00 #299458
by cornholio
Replied by cornholio on topic Out of inputs
The 2nd port on the 7i92 can be used.
A opto isolator board, something found on eBay or AliExpress or a dozen places, can be used to provide voltage translation.
A opto isolator board, something found on eBay or AliExpress or a dozen places, can be used to provide voltage translation.
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01 May 2024 13:28 #299461
by COlger81
Replied by COlger81 on topic Out of inputs
Is there a mesa option to achieve this? Would it be possible to use a spare encoder input on the 7i77?
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01 May 2024 13:32 #299462
by COlger81
Replied by COlger81 on topic Out of inputs
1 of the 3 inputs needed will be used for a prox sensor to home ATC turret.
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01 May 2024 13:46 - 01 May 2024 13:55 #299464
by PCW
Replied by PCW on topic Out of inputs
Yes, you can use spare encoder pins as general purpose inputs.
They will work with 5V signals if set to single ended mode.
The encoder inputs have a 2K pullup resistor to 5V (so will work
with NPN proximity switches) The single ended encoder inputs
are safe to +12 and -7V.
The pin names will be:
hm2_7i92.0.encoder.0x.input-a
hm2_7i92.0.encoder.0x.input-b
hm2_7i92.0.encoder.0x.input-index
They will work with 5V signals if set to single ended mode.
The encoder inputs have a 2K pullup resistor to 5V (so will work
with NPN proximity switches) The single ended encoder inputs
are safe to +12 and -7V.
The pin names will be:
hm2_7i92.0.encoder.0x.input-a
hm2_7i92.0.encoder.0x.input-b
hm2_7i92.0.encoder.0x.input-index
Last edit: 01 May 2024 13:55 by PCW.
The following user(s) said Thank You: RotarySMP
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01 May 2024 13:52 #299465
by COlger81
Replied by COlger81 on topic Out of inputs
That's perfect. Thanks for the help.
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