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Topic: Sending/Receiving SysEX by Port ID (Read 1690 times) |
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Lynn
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Sending/Receiving SysEX by Port ID
« on: Apr 10th, 2005, 1:29pm » |
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I have been writing MIDI-OX scripts for years, and I was very happy when the ability to direct regular midi output to a SPECIFIC port became available.
Unfortunately, it seems that the port from which SysEx input arrives is not passed to the script.
Worse, the documentation on SendSysExString or SendSysExFile shows no parameter for specifying which OUTPUT port to send the SysEx data. In fact, the doc says explicitly that the SysEx data is sent to "all ports attached by an instance".
Is there no way to direct SysEx output to a specific device? I have sevenal devices attached: Roland 8850, Roland 88VL, Roland D-110, Sound Blaster Live -- and all of them have unique SysEx specifications! How am I to keep from sending the same SysEx messages to ALL of them at once?
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Peter L Jones
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Re: Sending/Receiving SysEX by Port ID
« Reply #1 on: Apr 10th, 2005, 2:57pm » |
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on Apr 10th, 2005, 1:29pm, Lynn wrote:| How am I to keep from sending the same SysEx messages to ALL of them at once? |
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SysEx is designed to work with multiple devices on a single cable. So long as each device knows its SysEx ID and disregards SysEx messages destined for other devices, you're okay. Devices that don't do this aren't fully MIDI-compliant.
Some devices extend this by adding an "instance ID" of some sort to the SysEx message. That lets you target a specific instance of a specific device.
So it should "just work"... (Okay, I guess you're sending SysEx down cables you didn't need to...)
<edit>
Oh... Uh, I guess there may be some "generic" SysEx messages a manufacturer like Roland might use on all their devices - like, say, reverb parameters or something... That could cause problems... Still, it's a bit naughty if they do...
</edit>
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| « Last Edit: Apr 10th, 2005, 3:00pm by Peter L Jones » |
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"...Playing fast around the drums is one thing. But to play with people for others, to listen to, that's something else. That's a whole other world." -- Tony Williams
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Jamie OConnell
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Re: Sending/Receiving SysEX by Port ID
« Reply #2 on: Apr 19th, 2005, 2:09pm » |
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As Peter mentioned, SysEx has the target device model and manufacturer encoded in it, by definition, so it is safe to send to any device connected.
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--Jamie
Music is its own reward.
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