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Operation
General use
In use, the SRX modules should be transparent - the system and its peripherals
should operate exactly as normal, the only difference being that they are now up
to 50 metres apart.
In some installations, you may see some ‘shadows’ to the right of high contrast
screen characters. This can be caused by an incorrectly selected sharpness setting
and it may be necessary to make adjustments to correct this. Please see Video
sharpness adjustment in the ‘Installation’ section.
Dual user arbitration
When using two sets of SRX modules to allow two users to access a single
computer, be aware that arbitration between the users is handled by the USB
sub-system of the computer. Unlike with other Black Box products, this means
that both users can control the computer at exactly the same time and the
resulting keyboard and mouse influences will be an amalgam of the two inputs
- i.e. a mouse move to the right by one user will cancel out a simultaneous left
mouse move by the other. The same is also true when the local module has
feed-through peripherals attached to it, adjacent to the computer.
For this reason, the SRX dual user arrangement is better suited to situations
where two users would not often require simultaneous access.
Peripheral operation
USB
Each SRX remote module provides four USB outlets, each of which can support
USB 2.0 peripherals at speeds up to 12Mbps. The SRX appears to the computer
as a four-port USB hub.
If the link between the modules is interrupted, any connected USB peripherals
will be automatically disabled and re-enabled once the connection is restored.
[MS2 variant only] Note: When connecting four USB devices to the unit, ensure
that their total power requirements do not exceed 1700mA (1.7A). The USB
standard states a maximum allowable current draw of 500mA (0.5A) per device,
although most devices remain well below this limit - USB keyboards and mice
typically require 100mA. Each X50 contains a self-resetting fuse that will prevent
damage by shutting down the unit if the total power draw becomes excessive.
RS232 serial
The dual VGA variant modules provide additional support for an RS232 device.
The 9 way male D-type socket on the remote module supports speeds up to
115,200 baud and all PC-AT flow control pins are supported.