Network Technologies ST-xU operation manual Loop Back, Unit Address

NTI NODEMUX SERIES UNIVERSAL KVM SWITCH

Loop Back

In order for an RS232 command and a response to the command to be viewed at the terminal screen, the NODEMUX must have its Loop Back feature enabled.

More than one NODEMUX may be connected to a terminal at a time. To do so, a Matrix-Y-1 cable (available from NTI) must be used. (See Fig. 32). For each additional NODEMUX connected, another Matrix-Y-1 cable will be required.

If the NODEMUX is one of two or more switches being controlled via RS232, and if the NODEMUX is not that last switch in the series of switches controlled, then this setting should be changed to "DISABLED".

If the NODEMUX is the only device controlled via RS232 , or if it is the last device in a series of devices being controlled, then this setting should remain "Enabled". (See Figure 32)

To enable or disable loop back, from the Switch Configuration mode menu (above),

press <Tab> until the cursor bar moves to highlight "LOOPBACK".

CPU	RS232	Matrix-Y-1	Matrix-Y-1	Matrix-Y-1
	Serial Port
(terminal)
	RS232		RS232	RS232

Press < > (up arrow) or < > (down arrow) to enable or disable loop back as needed for the application.

NODEMUX	NODEMUX	NODEMUX
SWITCH	SWITCH	SWITCH
First Unit	Second Unit	Last Unit
Disable Loopback	Disable Loopback	Enable Loopback

Figure 32- Daisy chain configuration with Matrix-Y-1 cable

Unit Address

In order for a terminal to communicate with one or more NODEMUX switches, each switch must have a unique address. The NODEMUX will only respond to commands from a terminal if its address is embedded in the command. Up to 15 NODEMUX switches can be connected in a "daisy chain" to a terminal, each with its own unique address.

To set the address of the NODEMUX, from the Switch Configuration mode menu (Fig. 31 on page 28), press <Tab> until the cursor bar moves to highlight "RS232 UNIT ADDRESS".

press < > (up arrow) or < > (down arrow) until the desired address (1-15) is selected.

Exit Switch Configuration Mode

Once changes are made to the Switch Configuration menu, press <Enter> and <Y> to save them.

To exit without saving, press <Esc>, then <N>, then <Esc> again. The menu will return to the Administration Mode without saving the changes made. .

Changes made will take effect the next time the NODEMUX is power cycled.

Note: In order to connect multiple NODEMUX units together a Matrix-Y-1 cable must be used. (See Fig. 33.) See Fig. 34 for the pinout of the Matrix-Y-1 cable.

RS232	Matrix-Y-1	Matrix-Y-1	Matrix-Y-1
CPU SerialPort

RS232	RS232
NTI	NTI
SWITCH	SWITCH
FirstUnit	SecondUnit

Figure 33- RS232 connection with Matrix-Y-1 cable

RS232

NTI

SWITCH

LastUnit

29