Hall Research Technologies, Inc. Model VS-4A 4 Channel VGA Switch with Audio & Serial Control • • • Switches Between 4 PC Video and Audio Signals Manual or Auto Switching Based on Active Video RS-232 Serial Control UMA1120 Rev 1.1 © Copyright 2007. Hall Research Technologies, Inc.. All rights reserved.
4 Channel VGA Switch w/Audio & Serial Control Contents 1. INTRODUCTION.............................................................................. 2 1.1 GENERAL ........................................................................................ 2 1.2 FEATURES ....................................................................................... 2 2. INSTALLATION ............................................................................... 3 2.1 REQUIRED CABLES ....................................
Channel VGA Switch w/Audio & Serial Control 1. Introduction 1.1 General Thank you for purchasing Hall Research Technologies VS-4A 4x1 VGA Switch with Audio & Serial Control. This unit provides a video along with audio output that can be switched between four video and audio sources. The unit is housed in a small RFI shielded enclosure and is supplied with a universal AC power adapter.
4 Channel VGA Switch w/Audio & Serial Control 2. Installation 2.1 Required Cables The video input cables are generally HD15 (VGA) male to male (customer furnished). The Audio inputs are 3.5 mm mini-stereo plugs (customer furnished). If you are going to connect the unit to a Serial port (such as PC’s COM) you would need a straightthrough Male/Female DB9 Serial Cable (customer furnished). 2.2 Inputs & Outputs The VS-4A has 4 video and audio inputs marked Video 1 through 4 and Audio 1 through 4.
4 Channel VGA Switch w/Audio & Serial Control 2.
4 Channel VGA Switch w/Audio & Serial Control 3. Configuration & Operation 3.1 Modes of Operation Auto Mode - This will select the VGA and Audio input with the highest priority that has an active VGA signal. Scan Mode - Will select each active VGA and Audio input signal for a specified number of seconds, 1-60, and then switch to the next active VGA input. The VS-4A can also be configured to scan the non-active VGA inputs as well as the active VGA inputs.
4 Channel VGA Switch w/Audio & Serial Control 3.2 Front-Panel Switches The front panel switches may be locked out so pressing them has no effect. Locking and unlocking the front panel switches can only be accomplished via the serial RS-232 commands. The first function of the front panel buttons is to switch from one VGA & Audio signal to another. Just press the button and the VGA signal you selected will be displayed when the front panel is not locked.
4 Channel VGA Switch w/Audio & Serial Control 3.3 RS-232 Control The VS-4A can also be controlled via a serial device. The unit operates at a baud rate of 4800 bps. From the serial port, you have full control over the operation of the switched output; mode, priorities, scan time and front-panel lock status. Note on RS-232 port availability on your PC Most PCs and notebooks do not have a serial port. So to program the Switch you may need a USB to RS-232 Serial converter.
4 Channel VGA Switch w/Audio & Serial Control After power-up the unit will output the following menu in ASCII through its serial port: 1 2 3 4 a s b u p r l = = = = = = = = = = = Ver1.0 -----#1 In #2 In #3 In #4 In Auto mode Scan Blank Un-Blank Priorities Reset Lock/Unlock 3.
4 Channel VGA Switch w/Audio & Serial Control ASCII a (or Hex 61) Enters ‘Auto’ mode. In Auto mode, the device automatically switches to the video & audio input source that is active. “Active” means that video signal has sync signal, it does not mean there is a non-static screen! ASCII s (or Hex 73) Enters ‘Scan’ Mode. The user is first prompted to enter the switching time delay from 1-60 seconds.
4 Channel VGA Switch w/Audio & Serial Control ASCII p (or Hex 70) Selects video input priorities. The device will ask for the priorities for each of the four inputs via a prompt the user must respond to. “In X is [Y] (1-4)?” Where ‘X’ is the Video input and ‘Y’ is its current priority. Entering ‘0’ for a video input priority will keep the existing priority. Priority can range from 1 to 4, 1 being the highest and 4 being the lowest.
4 Channel VGA Switch w/Audio & Serial Control 4. Troubleshooting 4.1 In Case of Trouble There are no field serviceable parts or circuits in the device. If you think that the device is malfunctioning, please first make sure that all your connections are solid, and check the state of the LED’s on the front of the unit to access the mode it is in. If you still cannot overcome the problem, disconnect the video and audio input connections from the unit.
4 Channel VGA Switch w/Audio & Serial Control 5. Specifications Video Inputs VGA, RGBHV, RGBS, RGsB, or Component Video (YPbPr – would require HD15 to 3 RCA adapter) Resolutions Supported PC from VGA to UXGA (640x480 to 1600x1200) HD from 480p to 1080p Audio Inputs PC or Consumer audio (standard line-level) Video Level 0 to 0.
Product Designed and Made in the USA