Product Description
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Key Features
• Switching between 2 USB sources signals to control 1 device
• Can be controlled remotely via JED controllers
• Work well with T430 / T440 / T460 controllers
• Front panel toggle switch (Manual mode)
• Revert Channel B to A when Ch-B is powered down (Auto mode)
* Includes power supply
The JED 439 is a 2-channel USB switcher typically for use in a classroom where two sources of USB signals need to control one device, e.g. an Electronic Whiteboard (EWB).
The JED switchers are controlled remotely from an A/V controller such as JED's T430, T440 or T460, but can be controlled by any external device which can generate one, two (or three) contact closures to ground or a simple RS232 control command.
They can also be used in a manual mode via a front panel toggle switch (A/B, 439) (or Select switch, 443) or in "Auto" mode where the act of plugging in a channel B cable switches the USB output to Channel B, but it reverts to Channel A when the Channel B USB is powered down or unplugged. (In the 443, Channel C has the highest priority.) So, in a classroom, the act of plugging in a teacher's laptop steers the USB connection to that laptop.
RS232 mode commands are sent in via RS232 rather than contact or logic/switch inputs. Simple commands are sent in at 38400 baud 8N1:
| Product: | 439 command |
| Set channel A: | :R161<CR><LF> |
| Clear channel A: | :R160<CR><LF> |
| Set channel B: | :R171<CR><LF> |
| Clear channel B: | :R170<CR><LF> |
