AMX UDM-0404 - Manual (Page 91)

UDM Hub Control Protocol
79 UDM-0404 4x4 Multi-Format Distribution Hub
UDM Hub Control Protocol
Overview
The UDM Hub often forms part of a larger system where control of switching and management functions is
provided by an external system (for example, AMX or Crestron controllers).
This section describes the protocol for communications between the management software and the UDM hub
using either a 10BaseT network connection or a SLIP encapsulated serial stream to the console port. It also
describes (where applicable) the commands usable by a user with a terminal connection to the console port.
UDP (Ethernet) vs SLIP (RS-232) Communication
The UDM hub communicates over a 10BaseT connection using UDP packets or over a serial link using UDP
packets encapsulated using SLIP. In both cases, the UDM hub accepts a set of command and data values to
carry out various actions, which are detailed in this section.
These command and data values are encapsulated in a frame for transmission from the host to the hub. In most
cases this encapsulation will be provided by the host software, but in the case of simple SLIP commands, it
might have to be supplied by the customer software or driver.
By default, the UDM Hub is configured for UDP (Ethernet) communication.
To use SLIP (RS-232) communication, the Authenticate SLIP option on the Setup web
configuration page must be enabled (FIG. 105):
Beyond enabling the Authenticate SLIP option shown in FIG. 105, the crucial difference between UDP and
SLIP commands is that SLIP commands must be encapsulated with:
SEND_STRING UDM, "$C0"
The information in this section applies to UDM-0404, UDM-1604 and UDM-1604C
Hubs.
Unless otherwise specified, all data and command values are shown in decimal
(base 10).
FIG. 105 Setup Page - Authenticate SLIP option enabled
By default, the Authenticate SLIP option is disabled, which precludes the use of
RS-232 communication on the Hub.