Network Technologies ST-xU RS232 Connections and Configuration, Remote Connection, Baud Rate

NTI NODEMUX SERIES UNIVERSAL KVM SWITCH

RS232 CONTROL

RS232 Connections and Configuration

Rear View of ST-4U-RS

NTI		RS232	1275 Danner Drive, Aurora Ohio 44202			330-562-7070	www.nti1.com
	R	NETWORKTECHNOLOGIES INCORPORATED
			V	V	V	V	M
			I	I	I	I	O
			D	D	D	D	N
			E	E	E	E	I
		OFF	O	O	O	O	T
							O
		1 2 3 4 5 6 7 8	4	3	2	1	R
		ON
5VDC							DAISY	DAISY
2A			CPU 4	CPU 3	CPU 2	CPU 1	DEVICES OUT	IN

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Remote Connection

The RS232 Interface is designed to meet the RS232C standard and can be controlled from any terminal (CPU or other controller with an RS232 communications port.). The pin-out for the DB-9 connector on the unit is as follows:

RS232 Connector (DB-9 FEMALE)

PIN	SIGNAL	FUNCTION
1	CD	Carrier Detect
2	TXD	Transmit data (RXD at host)
3	RXD	Receive data (TXD at host)
4	DTR	Data terminal ready
5	GND	Signal ground
6	DSR	Data set ready
7	RTS	Request to send
8	CTS	Clear to send
9	-	No connection

Note: Security must be disabled or user access granted on the port(s) to be selected by RS-232 control.

On the DB-9 female connector, pins 1 (DCD), 4 (DTR), and 6 (DSR) are shorted and pins 7 (RTS) and 8 (CTS) are shorted. Therefore, host handshaking is bypassed and TXD and RXD are the only active signals. A straight through DB-9 cable (not null modem) will work for most CPUs. To daisy chain multiple units, a Matrix Y-1 cable is used (see page 29) for each NODEMUX in the chain. The last unit will have no connection on its output port and should have DIP switch 1 ON (see table under "Unit Address and Loop Back" on page 28).

Configuration via Dip Switches

Note: Only legacy NODEMUXs have the dip switch for RS232 configuration. If the dipswitch (as shown above) is not present, refer to "Configuration via OSD" on page 28.

Baud Rate

The baud rate can be changed by powering down the unit, changing the 8 position RS232 dip switch on the rear of the NODEMUX (legacy switches only) , and then powering back up. The table below shows how to set the baud rate.

	DIP SWITCH			BAUD RATE
4		3	2			OFF
OFF		OFF	OFF	300
					1 2 3 4 5 6 7 8
OFF		OFF	ON	600
							ON
OFF		ON	OFF	1200
OFF		ON	ON	2400
ON		OFF	ON	9600
ON		ON	OFF
ON		ON	ON

Figure 30- RS232 dip switches

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