Configuration And Control - AMX Modula Instruction Manual

RS-422 Boards

Configuration and Control

Due to the RS-422 board's bi-directional switching capability, a basic command that routes a controller's
signal to a device will also return a status signal from that device to the controller. The board's toggle
switch settings do not affect system control.
Important: X-Ports are always controlled as inputs/sources; Y-Ports are always controlled as
outputs/destinations.
The toggle switch settings determine the nature of the signals routed and returned during switching.
If any toggle switches are changed from their default settings, the signal types as explained here need to
be interpreted accordingly.
Control Panels
Use the Change command sequence for the control panel (see the control panel's documentation).
When entering the command, for an X-Port select Input (or Source depending on the control panel) and
for a Y-Port select Output (or Destination). Depending on the panel, you may need to specify the Input
first in the Change command.
BCS Commands
When entering any of the switch commands, for the X-Port use an I command character (normally
thought of as "Input") and for the Y-Port use an O ("Output"). It does not matter whether the I or the O is
specified first in an execute switch command. For information on BCS command characters and
command line formats, see the Instruction Manual – BCS Basic Control Structure Protocol on the
AMX AutoPatch CD or at www.amx.com.
X to Y Point-to-Point (Default)
An X to Y Point-to-Point configuration is the factory default for routing RS-422 systems. Using a single
command, this configuration allows for one controller signal from an X-Port to be routed to one Y-Port
and for a device status signal from that Y-Port to be automatically returned to the X-Port (FIG. 100). With
this configuration, routing one-to-many signals is not possible. If the RS-422 system has been
configured for complex routing, see "Advanced Configuration and Control" on page 144.
FIG. 100
X to Y Point-to-Point configuration
Control Panel
For the example in FIG. 100, enter a Change command that routes Input (X-Port) 1 to Output (Y-Port) 2.
A device status signal automatically returns from Y-Port 2 to X-Port 1.
BCS Control
Enter the following command for the example in FIG. 100.
CL0I1O2T
In this command, a controller signal is routed on Level 0 from X-Port 1 to Y-Port 2, and a device status
signal automatically returns from Y-Port 2 to X-Port 1.
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