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NTI RACKMUX KVM Drawer with UNIMUX Switch
Unit Address and Loop Back
To allow multiple units to be controlled from a single CPU serial port, the RS232 control interface is designed to allow "daisy
chaining" up to 7 units. By setting the appropriate RS232 DIP switches, each unit can be given a unique address (1-7). Then the
unit will only respond to commands on the bus if its address is embedded in the command. Use the following table to set the unit
address.
DIP SWITCH
8
7
6
5
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
Note: Pin 4 on the RS232 DIP switch is not used.
In order to connect multiple switches (up to 7) with RS232 connections to the same CPU, an NTI Matrix-Y-1 cable must be used.
Connect the Matrix-Y-1 cable (sold separately) between the RJ45-to-DB9 serial adapter (supplied) and the CPU as shown in
Figure 16.
RS232
Serial Port
CPU
RJ45
TO DB9
SERIAL
ADAPTER
CAT5 CABLE
RS232
NTI
SWITCH
First Unit
Figure 16- RS232 connection with Matrix-Y-1 cable
UNIT ADDRESS
0 (not valid)
1 (default)
2
3
4
5
6
7
Matrix-Y-1
Matrix-Y-1
RJ45
TO DB9
SERIAL
ADAPTER
CAT5 CABLE
RS232
NTI
SWITCH
Second Unit
Note: The "loop back" RS232 DIP switch (RS232 DIP
switch 1) should be ON for each unit in the chain.
Matrix-Y-1
Note: The maximum combined
RS232 cable length between the
RJ45
CPU and any NTI switch cannot
TO DB9
exceed 15 feet.
SERIAL
ADAPTER
CAT5 CABLE
RS232
NTI
SWITCH
Last Unit
15
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