NTI UNIMUX MULTI-USER KVM SWITCH
38
RS232 CONTROL
RS232 enables the UNIMUX to be remotely controlled via RS232. To control the UNIMUX via RS232 the user has three options:
•
write a program that runs on a PC using the Command Protocol (page 40)
•
use the Matrix Switcher's Control Program (page 41) provided on the CD
Remote Connection
The RS232 Interface is designed to meet the RS232C standard and can be controlled from any CPU or other controller with an
RS232 communications port. The pin-out for the RJ45 connector on the unit is as follows:
RS232 (RJ45) CONNECTOR
PIN
SIGNAL
FUNCTION
1 -
No
connection
2 -
No
connection
3
RX+
Receive data (TXD at host)
4 GND Ground
5 -
No
connection
6
TX+
Transmit data (RXD at host)
7 -
No
connection
8 -
No
connection
NOTE: Security must be disabled or user access granted on the port(s) to be selected by RS232 control.
A 5 foot patch cable and two adapters, RJ45-to-DB9 and RJ45-to-DB25, have been provided for connection to most CPUs (see
page 11). To daisy chain multiple units, connect a Matrix-Y-1 cable (sold separately) between the CPU and the first switch, and
between each switch (as shown in Figure 45).
Baud Rate
The baud rate can be changed by selecting MENU on the front panel keypad, using the OSD menu, or from the RS232
commands (page 40). The baud rate can be set to 115000, 57600, 38400, 19200, 9600, 4800, 2400, or 1200. A data protocol of
8 data bits, no parity, and 1 stop bit is used for communications.
Unit Address and Loop Back
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 using an NTI Matrix-Y-1 cable. Connect the Matrix-Y-1 cable between the RJ45-to-DB9 serial adapter (provided with
the RS232 option) and the CPU as shown in Figure 45. By setting the appropriate unit address (page 35), each unit can be given
a unique address (1-15). Then the unit will only respond to commands on the bus if its address is embedded in the command.
