External_Control - AMX AXCESS CONTROL SYSTEM PROGRAM Instruction Manual

The External_Control Protocol
This is the exact packet as sent previously with the exception of a different attention byte; it is $26
because this is a response.
If you don't want these responses to appear, you can turn them off by sending the RESPONSE
MASK command (11) with the appropriate mask byte. Only three responses can be turned off, and
their mask bit positions are shown in FIG. 30. A zero (Ø) bit turns the response off, and a one (1) bit
turns the response on.
FIG. 30 The bit location of several responses in the mask byte
For example, to turn off RECEIVE STRING responses and turn on GET PUSH and GET
RELEASE responses, send the mask byte $6Ø as shown in FIG. 31.
FIG. 31 The mask byte for one combination of response preferences

External_Control

This keyword tells the Central Controller to use a particular Axcess RS-232/422 Interface Card as
an external control port. Once a port has been thus defined, all system functions can be controlled
by an external computer or by another device using RS-232/422. This keyword can only be used in
the DEFINE_START section of the program, and only once. Here is the syntax:
EXTERNAL_CONTROL (device)
Axcess Programming Language 115