Network Technologies KEEMUX-P2 - Manual (Page 8)

6
Keyboard Features
The keyboard configuration of each CPU is saved in the NTI Switch. For example, if the CPU attached to Port 2 had CAPS LOCK
and NUM LOCK selected the last time that CPU was accessed, then they will automatically be set when that CPU is accessed
again.
AUDIO SUPPORT
(Optional)
Audio support provides the following additional features:
•
Audio signals from the same CPU that keyboard, mouse, and video signals are from can be received by the user.
• Audio inputs accept any standard line level audio (1Vrms or 2.5Vp-p).
• Audio outputs are capable of driving an 8 Ohm speaker load with 200mW of continuous RMS power.
Audio signals are switched along with the keyboard, mouse and video signals using the buttons on the KEEMUX switch.
DUAL VIDEO SUPPORT
(Optional)
Dual Video support enables CPUs with two video outputs to be connected to the KEEMUX switch and two user monitors to be
connected to view both sets of video signals. Both monitors must be of the type VGA multi-scan.
RS232 CONTROL
(Optional)
RS232 Connections and Configuration
Remote Connection
The RS232 Interface is designed to meet the RS232C standard and can be controlled from any host CPU or other controller with
an RS232 communications port. The pin-out for the DB-9 connector on the unit can be found on page 7. A straight through DB-9
cable (not null modem) will work for most CPUs.
Baud Rate
The baud rate of the host CPU can be changed by using the menus in the RMTEST program (see "RS232 Interface Test
Program" below). The desired baud rate of 9600, 2400, 1200, or 300 may be set. A data protocol of 8 data bits, no parity, and 1
stop bit is used for communications. The baud rate of the KEEMUX is configured using dipswitches (see page 7).
Unit Address
To allow multiple units to be controlled from a single host port, the RS232 control interface is designed to allow "daisy chaining" up
to 15 units. In order to connect multiple KEEMUX units together a Matrix-Y-1 cable must be used. (See Fig. 6). See Fig. 7 for
the pinout of the Matrix-Y-1 cable.
NTI
SWITCH
CPU
RS232
First Unit
NTI
SWITCH
RS232
NTI
SWITCH
RS232
Second Unit Last Unit
RS232
Serial Port Matrix-Y-1 Matrix-Y-1 Matrix-Y-1
Fig. 6