Wiring for rs-232 communication, Rs-232 port, Rs-232 pass thru port – Extron electronic RSB 126 User Manual

Page 14: Rs-232 port -10 rs-232 pass thru port -11, Installation, cont’d

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SW USB Series • Installation

Installation, cont’d

2-10

SW USB Series • Installation

2-11

The pinout for the host PC to the SW USB is shown below:

Host PC Pin

Switcher Pin

2 (Rx)

TX

3 (Tx)

Rx

5 (Gnd)

_

RS-232 Pass Thru port

The RS-232 Pass Thru port allows you to loop through the

Transmit line of the RS-232 control port from the SW USB. This

enables you to send SIS commands to another Extron A/V

switcher. See chapter 4, “SIS Configuration and Control”, for

explanations of these SIS commands.

N

Only Extron products can be controlled via this port.

The SW USB sends SIS commands to the A/V switcher in the

following loop-through modes:

Loop 1 mode

(default) — In this mode, SIS commands

can be issued to the SW USB and/or passed through to a

connected A/V switcher via an RS-232 interface (such as

DataViewer or HyperTerminal) on your computer.

To enable Loop 1 mode, issue the

E

1LOOP

}

command.

Loop 0 mode

— In this mode, the input selection SIS

command

X!

! can be issued to the SW USB via contact

closure, the SW USB front panel buttons, or the RS-232

interface. The SW USB subsequently passes the command

through to a connected A/V switcher.

To enable Loop 0 mode, issue the

E

0LOOP

}

command.

N

In Loop 0 mode, you can still issue commands to the

SW USB using the front panel buttons, RS-232, or

contact closure in both loop modes. The loop mode

selection affects only commands coming through the

RS-232 Pass Thru port.

The diagram on the next page shows how to wire the SW USB’s

RS-232 Pass Thru port for use with an Extron A/V switcher.

(The SW USB’s RS-232 Pass Thru port does not have a receive

pin; therefore, it does not receive responses from the connected

A/V switcher.)

Wiring for RS-232 Communication

RS-232 port

The three-pin, 3.5 mm captive screw connector labeled “RS-232”

is used for optional RS-232 communication between the SW

USB and a PC or control system. The control system plugged

into this port can issue commands to the SW USB, which can

pass the commands through to an Extron A/V switcher that is

plugged into the RS-232 Pass Thru port.

N

Your RS-232 computer or control system should not be

one of the host devices that are being switched. Use a
separate computer for RS-232 control.

To connect your computer or control system to the RS-232

connector, use a male 9-pin, D-to-bare-wire RS-232 cable.

One end of the UC cable is terminated with a female 9-pin D
connector, and the other end is unterminated.
1

.

Wire the unterminated end of the RS-232 cable to one of

the provided three-pin captive screw plugs.

2

.

Plug the wired three-pole connector into the RS-232

receptacle on the switcher’s rear panel.

The figure below shows how to wire this connector for RS-232.

If you use cable that has a

drain wire, tie the drain wire to

ground at both ends.

Connect a ground wire between

the switcher and the computer or

control system.

RS-232

To Computer or
Control System
RS-232 Port

SW USB Switcher
Rear Ranel
RS-232 Port

Tx Rx

9 pin HD

Connector

(Rx)

Receive Pin to Transmit (Tx) Pin

3

Ground

(Tx)

Transmit Pin to Receive (Rx) Pin

2

RS-232 connector pin assignments

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