RS232 Control

Remote Connection

The RS232 Interface is designed to control the switch via serial (RS232) daisy chain connection from any host computer 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

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" cables, except for the last unit connected. (see Fig 3).

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 illustration below.)

RS232

Matrix-Y-1

Matrix-Y-1

Matrix-Y-1

Host Serial Port

 

 

 

CPU

 

 

 

RS232

 

RS232

RS232

NTI

 

NTI

NTI

SWITCH

 

SWITCH

SWITCH

First Unit

Second Unit

Last Unit

Figure 3- RS232 Connections for Daisy-chain

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Network Technologies SM-nXm-AV-LCD operation manual RS232 Control, Remote Connection, Baud Rate, Unit Address
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SM-nXm-AV-LCD specifications

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In summary, Network Technologies SM-nXm-AV-LCD stands out in the market due to its high-resolution support, flexible connectivity options, and user-friendly design. With advanced processing capabilities and secure networking, it is a reliable choice for organizations looking to enhance their audiovisual setups. Its combination of performance, versatility, and security makes it an indispensable tool in the modern digital landscape.
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