Remote Connection, Baud Rate | Network Technologies ST-NXM-U-HD

RS232 Control

Remote Connection

The RS232 Interface is designed to control the switch via serial (RS232) daisy chain connection from any CPU or other controller with an RS232 communications port. There is, however, a restriction that must be followed:

A program must be used that will send an entire command line all at once, not character by character. (The HyperTerminal program in WINDOWS cannot be used, as it sends each character one at a time.)

The pin outs for the DB-9 connector on the unit are as follows:

RS232 INPUT (DB-9 FEMALE)

PIN	SIGNAL	FUNCTION
PIN	SIGNAL	FUNCTION
1	none	no connection
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	none	no connection

On the DB-9 female connector, pins 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, use NTI Matrix-Y-1 "Y" cable (see Fig 10).

Baud Rate

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. The baud rate is selectable through the "Baud Rate Menu". A data protocol of 8 data bits, no parity, and 1 stop bit is used in the daisy chain communication.

Unit Address

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 the NTI Matrix-Y-1 "Y" cables. By setting the appropriate unit address with the keypad, 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. (See Fig. 9.)

RS232	Matrix-Y-1		Matrix-Y-1
Host SerialPort
CPU
RS232			RS232
NTI			NTI
SWITCH			SWITCH
FirstUnit		SecondUnit

Matrix-Y-1

RS232

NTI

SWITCH

LastUnit

Figure 10- RS232 Connections for Daisy-chain

Command Protocol

Host controller commands supported by the unit are defined below. All commands should be terminated with a <CR> (carriage return). When a command is sent, the entire string is echoed back to the host along with a response from the addressed unit as shown in the command definitions. All characters should be upper case, and all numbers below 10 should have a leading 0 (ex: 1 = 01).

NOTE: For units with one output or user port, use 01 for the output select.

ST-NXM-U-HD specifications

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RS232 Control