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Response to: DD30 and GVG 200 Protocol

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Rolf Grzibek
User offline. Last seen 12 years 15 weeks ago. Offline
Joined: 24 Oct 2005

DD30 and GVG 200 Protocol

Posted By: Rafal
Date: Thu, 25 Aug 2005, at 12:25 p.m.

I need a litle help with my DD30 mixer and gvg 200 protocol. We has some problems with communiucation from computer, when we start mixer and connect PC computer we cannot control mixer, but when we connect Editor, and pres 2-4 times source select button, we could control mixer, even if we connect PC. I think there is a initiation sequence or unblocking sequence. Anybody has same problem or know how to fix this problem. We need to connect vizRT to DD30 ??
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Rafal,

your edit controller sends the BREAK + ADDRESS sequence specified by the Model 200 protocol before sending other commands - which is then ACKed by the switcher. Your PC very likely does not send this Sequence. The BREAK is a superlong zero (17-20 bits long low). The ADDRESS needed is 0x30. The ACK is 0x84 and the NAK is 0x85.

hth

Rolf