Lantronix SecureLinx Spider User Manual page 15

For Linux systems, edit the Xfree86 file XF86Config to disable formats that are not
supported or not VESA standard timing; a reboot is required.
If you are using a special video card or another operating system on the target, consult
the appropriate documentation.
Solaris servers may need to be set to output H+V sync, not composite sync. The power-
down-monitor settings in the operating system's power management have no effect on
the Spider's internal operation and network interface, but if the attached server is in a
monitor power-down mode the client application displays "No Video" and the Video LED
will be out. The "Video" LED on the Spider actually monitors the vertical sync signal, not
the video data itself.
Background wallpaper and desktop appearances do not have any particular limitations,
although Microsoft Active Desktop and Linux graphical interfaces' virtual desktop are not
supported. If bandwidth is a concern, plain backgrounds are preferred.
Mouse
Mouse to cursor synchronization has long been a troublesome issue with digital KVM
interfaces. PS/2 mice transmit incremental information about movement over a period of
time, not an absolute measurement; the driver in the operating system then translates to
distance based on the local screen resolution and applies linear or nonlinear acceleration
mappings. When a remote client system is communicating with the target system,
settings and screen resolutions on both sides of the connection must be taken into
account in order to get natural mouse-to-cursor tracking. Use the USB keyboard/mouse
when supported by the target computer. Unlike the PS/2 interface, a USB mouse uses
absolute coordinates rather than relative coordinates and hence does not present the
difficulties in translation between local and remote systems. On the PS/2 model Spider,
when the keyboard/mouse interface is set to Auto it will first attempt to use the USB
interface and only if it does not detect support in the attached OS will it fall back to PS/2.
There are no restrictions on the mouse settings of the client systems. And as a general
rule, no special care must be taken on setting mouse parameters of target systems when
using the USB mouse interface. For the PS/2 interface, performance (tracking) and
synchronization can be optimized by removing any special acceleration or nonlinear
ballistics. For several common operating systems:
On a Windows target system, select Control Panel Mouse Pointer Options. Set
the pointer speed to medium and disable Enhanced pointer precision.
Linux graphical interfaces. Set Mouse Acceleration to exactly 1 and threshold to
exactly 1. Also, select Other Operating Systems on the Spider mouse settings page.
Sun Solaris. Adjust mouse settings via the CDE control panel to "1:1, no acceleration"
or via "xset m 1".
Mac OS X. Set Spider to Single Mouse Mode.
Serial
If you plan on using the Spider to Telnet or SSH to the target system's serial port, set that
port to match the Spider's equivalent settings. The Spider's default serial settings are
115200 bps, 8 data bits, one stop bit, no parity, and no handshake. The pinout of the
included cable matches a standard DB9 COM port.
SecureLinx Spider User Guide
3: Installation
15