RS232 Interface Test Program

NTI NODEMUX SERIES UNIVERSAL KVM SWITCH

Dipswitches

The dipswitches located next to the RS232 connection (Fig. 8) are used to configure the baud rate and address of the NODEMUX. The default baud rate is 9600. The default address is 1. Use the charts below to change the baud rate and address as needed.

OFF

1 2 3 4 5 6 7 8 ON

Figure 17- RS232 Dipswitches

BAUD RATE

The baud rate can be changed by powering down the unit, changing the DIP switch, and then powering back up. This table shows how to set the baud rate.

	DIP SWITCH			BAUD
				RATE
4		3	2
OFF		OFF	OFF	300
OFF		OFF	ON	600
OFF		ON	OFF	1200
OFF		ON	ON	2400
ON		OFF	OFF	4800
ON		OFF	ON	9600
ON		ON	OFF	9600
ON		ON	ON	9600

DIP SWITCH

The unit powers up with a default baud rate of 9600 and a fixed data protocol of 8 data bits, no parity, and 1 stop bit. To change the baud rate, unit address, and loop back (more on the unit address and loop back later), an 8-SPST DIP switch on the panel near the DB-9 connectors can be used. This table shows the DIP switch functions and their default positions.

SWITCH	FUNCTION	DEF-
		AULT
1	loop back	ON
2	baud rate 0	ON
3	baud rate 1	ON
4	baud rate 2	ON
5	unit address 0	ON
6	unit address 1	OFF
7	unit address 2	OFF
8	unit address 3	OFF

UNIT ADDRESS

To allow multiple units to be controlled from a single host port, the remote interface is designed to allow "daisy chaining" of up to 15 units. By setting the appropriate DIP switches, 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. The "loop back" DIP switch should be ON for the last unit in the chain, and OFF for all other units. If only one unit is being controlled, DIP switch 1 should be left ON. This table shows how to set the unit address.

	DIP SWITCH			UNIT ADDRESS
8	7	6	5
OFF	OFF	OFF	OFF	0 (not valid)
OFF	OFF	OFF	ON	1
OFF	OFF	ON	OFF	2
OFF	OFF	ON	ON	3
OFF	ON	OFF	OFF	4
OFF	ON	OFF	ON	5
OFF	ON	ON	OFF	6
OFF	ON	ON	ON	7
ON	OFF	OFF	OFF	8
ON	OFF	OFF	ON	9
ON	OFF	ON	OFF	10
ON	OFF	ON	ON	11
ON	ON	OFF	OFF	12
ON	ON	OFF	ON	13
ON	ON	ON	OFF	14
ON	ON	ON	ON	15

RS232 communication is configured using the RMTEST program, located on the supplied floppy disk. This software allows a user to test the functions of an NTI NODEMUX or Multi-user/Multi-platform switch RS232 interface. The RMTEST program generates a main menu with the 3 selections described below:

MAIN OPTIONS
1.	Matrix Options	- send commands to the unit.
2.	Setup Options	- set COM port, baud rate, and unit address
3.	Quit	- quit the program