TView Pro AV
User's Manual Rev 2.01
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4.3.3 Selecting the TView Pro AV's address
In an RS-422, there may be as many as 8 TView Pro AVs operating within a system. In order to provide a control
mechanism to differentiate each TView Pro AV, the user must program each TView Pro AV's address using the Front
Panel.
Programming the address is a simple procedure. Turn the TView Pro AV on, or cycle the control sequence such that the
Power Up Identification is visible (i. e. Model 1024 or Model 1280) on the LED display. Press the Right Arrow Button.
You will see the TView Pro AV’s address indicated on the LED display. When you are finished, press either the + button
or the - button. The TView Pro AV will remember its address until you change it in the same fashion.
The address circuitry is active even you are using the RS-232 link (which does not permit multiple Pro AVs or other
devices to be connected in a multiple unit configuration). The default address is 0.
4.3.4 Sending Communications Commands to the TView Pro AV
The serial port of the TView Pro AV accepts serial data at 9600 baud, 8data bits, no parity bit, 1 stop bit. It is essential
that the serial communications device that delivers commands to the Pro AV be set up in this fashion. M
The TView Pro AV accepts 8 bit characters as commands. The commands to turn the TView Pro AV on and off are
received as strings of ASCII alphabetic characters and binary numbers. For the purposes of this manual, all ASCII
characters and binary numbers will be referred to with the decimal numbering sequence (i. e. the minimum value of a byte
is 0, the maximum value of a byte is 255, the value of an upper case A is 65).
The Command sequence for communicating with the TView Pro AV is as follows:
1)
The Activation Command is given. The Activation Command consists of the character string: HCRONx
(where x is the address of the TView Pro AV). The Activation Command (and all other commands) must be followed by
a Carriage Return (ASCII character value of 13 decimal) to be accepted.
The following byte string (using decimal values for ASCII characters) indicates a valid Activation Command for a TView
Pro AV previously programmed to be address 3:
72
67
82
79
78
03
13
H
C
R
O
N
3
<CR>
If the TView Pro AV receives any unexpected input before the reception of the Activation Command, it will ignore it. If it
receives an unexpected byte during the transmission of the Activation Command, the Activation Command must be re-
transmitted (the Activation sequence is reset).
2)
Individual Commands are given. Any number of commands may be given after the TView Pro AV is activated.
The TView Pro AV individual commands consist of 2 byte strings. Each 2 byte string is an internal Register Number
Byte (23 registers exist) followed by a Value Byte. The Value Byte has a different meaning and legal range for each
register. Each command ( i. e. Register Number Byte, followed by Value Byte) must be concluded with a Carriage
Return.
