421VS Switcher ** non-stocking item ** Click above for more images    Technovision manufactures a 4 to 1 vertical interval switcher with RS232 and TTL control. The switcher comes standard with RS232 and 2 or 4 wire TTL control via a male DB9 connector on the back of the unit. In 4 wire mode the switcher can be controlled with external momentary contact closures.    The 421VS is also compact (8.25" wide x 2" high x 3.5" deep) and comes standard in a desktop configuration, though rack mount kits are also available (421VS-RACK).    The 421VS comes standard with a composite sync output which eliminates the need to buy an external synch generator to lock the incoming signals.    In addition to the RS232 port for external control the 421VS has an additional RS232 port for custom applications such as controlling, and switching, two RS232 devices. Technovision can provide custom developed firmware for the 421VS if you require features not standard with the unit. 421VS Operating Guide CUE2T Firmware guide ........more manuals

KPC-2 Controller AC-1 Compact Controller RF Demodulator Pushbuttons RS232 Control TTL Control External Button Control NTSC and PAL switching Composite Sync Output 4 Video/Stereo RCA Inputs 1 Video/Stereo RCA Output Additional RS232 Port Microprocessor controlled for future expansion Power Requirements:   120VAC / 60Hz   (12VDC, 800mA power adapter included) Power Consumption:   3W max. Net Weight:   854 g. (1.88 lbs.) Dimensions (HxWxD):   64 x 211 x 90mm (2.5" x 8.25" x 3.5") Operating Temperature:   32 to +132 deg. F (0 to +50 deg. C) Operating Humidity   0 to 90 % non-condensing

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421VS External Control Pin Configuration Pin# Description of pin 1 Control line 1 2 Control line 3 3 RS232 RX (input) 4 Secondary RX 5 GROUND 6 Control line 2 7 Control line 4 8 RS232 TX 9 secondary RS232 TX

RS232 Control Protocol: 9600 BAUD, NO PARITY, 8 BITS, 1 STOP. To select input 1, 2, 3 or 4 send the ASCII character "0", "1", "2" or "3" 2 bit (line) TTL control (ACTIVE LOW)   SET CONTROL PIN TO SELECT INPUT 6 1 1 high high 2 high LOW 3 LOW high 4 LOW LOW 4 bit (line) TTL control (ACTIVE LOW) TO SELECT INPUT MOMENTARILY CONNECT PINS 1 1 and 5 2 6 and 5 3 2 and 5 4 7 and 5 EXAMPLE SCHEMATICS For more information contact: