Digital readout from magnetic or glass scales
26 Nov 2014 23:03 #53453
by DaBit
Replied by DaBit on topic Digital readout from magnetic or glass scales
Unless you buy the FPGA board plus daughterboards (such as a 5i25+7i85) you are actually making things more complicated. Mesa often uses multiplexed encoder channels, so you need both connectors on a 5i25 to interface 4 encoders without additional electronics.
I would either get things up and running with a $10 parallel port card, and see whether you need Mesa hardware or not. Or do thing right the first time and get a Mesa 5i25/6i25+7i85+cable or similar configuration. PCW could advise you on that. Mesa hardware is very well built, so that would be a far better option than a $10 parallel port card. Especially when combined with RS422 scales.
I would either get things up and running with a $10 parallel port card, and see whether you need Mesa hardware or not. Or do thing right the first time and get a Mesa 5i25/6i25+7i85+cable or similar configuration. PCW could advise you on that. Mesa hardware is very well built, so that would be a far better option than a $10 parallel port card. Especially when combined with RS422 scales.
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26 Nov 2014 23:16 #53454
by andypugh
You are right, the 7i77 uses 3 x multiplexed encoders for 6 channels.
So does the 7i85 ( 2 x multiplexed encoders for 4 channels)
PCW may be able to advise if there is a firmware with plain encoders for the 5i25.
Replied by andypugh on topic Digital readout from magnetic or glass scales
Unless you buy the FPGA board plus daughterboards (such as a 5i25+7i85) you are actually making things more complicated. Mesa often uses multiplexed encoder channels, so you need both connectors on a 5i25 to interface 4 encoders without additional electronics.
You are right, the 7i77 uses 3 x multiplexed encoders for 6 channels.
So does the 7i85 ( 2 x multiplexed encoders for 4 channels)
PCW may be able to advise if there is a firmware with plain encoders for the 5i25.
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26 Nov 2014 23:28 - 26 Nov 2014 23:29 #53456
by PCW
Replied by PCW on topic Digital readout from magnetic or glass scales
I can make up a plain encoder config for a 5I25
(there are 17 pins/connector so 5 encoders with index is possible or 8 encoders without index per connector is possible)
But... I agree with Dabit, if you dont run into speed limitations, this really has no advantages over a parallel port
(there are 17 pins/connector so 5 encoders with index is possible or 8 encoders without index per connector is possible)
But... I agree with Dabit, if you dont run into speed limitations, this really has no advantages over a parallel port
Last edit: 26 Nov 2014 23:29 by PCW.
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