Extron electronics SW USB Series Provozní pokyny stáhnout pdf (Strana 20)

Installation, cont’d

SW USB Series • Installation

2-10

PRELIMINARY

RS-232 Pass Thru port

The RS-232 Pass Thru port loops the signal received at the switcher’s RS-232 control

port, the Contact (closure) port, or the front panel input buttons through the RS-232

Pass Thru port to send SIS commands to another Extron A/V switcher.

Only Extron products can be controlled via this port.

You can congure the SW USB to send commands through the RS-232 Pass Thru

port to the A/V switcher in two loop modes:

• Loop 1 mode — The SW USB passes through only SIS commands received

via your computer’s RS-232 interface. (See “SIS command processing” in

chapter 3, “Operation”, for information on SIS commands that are supported

with the loop-through feature.)

• Loop 0 mode (default) — The SW USB passes through SIS commands sent

from the computer’s RS-232 interface (loop 1 mode) plus input selections

made via contact closure or the front panel buttons.

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.

See “Issuing commands to an Extron A/V switcher via the RS-232 Pass Thru

port” in chapter 3 for more information on the loop modes and commands.

See chapter 4, “SIS Programming and Control”, for explanations of the available

SIS commands.

The diagram below shows how to wire the SW USB’s RS-232 Pass Thru port for use

with an Extron A/V switcher. The RS-232 Pass Thru port does not have a receive

pin; therefore, it does not receive responses from the connected A/V switcher.

Host Port

SW USB

Extron

A/V Switcher

RS-232

Port

Pass Thru

Port

Connections for RS-232 loop-through

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Extron electronics SW USB Series Provozní pokyny Strana 20