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superiorcontrols
25 Posts |
 Posted - 28 Feb 2003 : 15:27:08
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When I configure my board to run in RS422/RS485 mode, my system runs exceedingly slow. Drew has suggested excessive hw interupts, and to test this, I left my jumper settings set to 485 half duplex mode, but set 485 mode OFF in the registry (Hkey_local_machine\drivers\builtin\serial\RS485=0).
This resolves the issue, or at least makes it go away. Do I need to terminate the serial port, even if nothing is connected to it, or something of the sort? I have also seen references in the postings to "automatic" serial events every 2000ms. Any thoughts? |
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superiorcontrols
25 Posts |
Posted - 28 Feb 2003 : 16:33:39
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As an interesting note . . . COM1 is *not* connected to anything yet!! My app is rather intensive on using COM2
When I start up, everthing is running really slow. I yank the ribbon cable out of J7, disconnecting Com2, in an unfriendly way, and the system starts running very well again.
Any help is very appreceiated. |
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superiorcontrols
25 Posts |
Posted - 28 Feb 2003 : 16:37:15
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Okay, just to clarify that this is NOT a cable issue: The same results accour if I disconnect my COM2 device at the other end too.
Sorry for the multi post. |
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akidder
1519 Posts |
Posted - 28 Feb 2003 : 16:46:34
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Eric has uncovered a bug in the GC Plus serial driver. If RS-485 is enabled, it inserts a 5ms delay (for powering off the transmitter) at the end of each data block on ALL serial ports, not just COM1.
The short term workaround is to transmit serial data in blocks, rather than one character at a time. This places the delay only at the end of the data block.
We regret any inconvenience this may cause our customers. We will correct the drivers and rebuild the image shortly. |
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superiorcontrols
25 Posts |
Posted - 28 Feb 2003 : 16:54:06
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Thanks for the acknowledgement, I think ;-)
Can you give us a better definition of "rebuild the image shortly?" Is this a few days, week, a month? Thanks again. |
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Mono
4 Posts |
Posted - 17 Mar 2003 : 11:54:12
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| Does this affect the GM as well or is this just a GC? I'm seeing problems in the GM as well although we are transmitting in blocks, however, the RTS line toggles the transmitter off during the middle of a block of data. |
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akidder
1519 Posts |
Posted - 17 Mar 2003 : 12:12:35
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We identified a timing problem in the RS-485 drivers recently and corrected it in GC Plus 32M build 3.45 and GMaster 32M build 3.36(zip 10MB)
Can you give that build a try and let us know if it takes care of the issue?
-Drew
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Microsoft Windows CE
RS485/RS422 Mode Slowness
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