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(3) Input/Output Electrical Interface
(4) Remote Control Commands
(5) RA6790/GM HF Receiver responses to remote control commands.
(6) FUnctions unique to the remote control operating condition.
Eacn of these. considerations is addressed in a following paragraph.
a. -Remote Control Data Character.
The data character used for remote control is the standard ASCII asynchronous format
which consists of a start bit, seven data bits (one ASCII Character), a parity bit, and
two stop bits. Figure 3-1 shows the data character format, and Table 3-1 lists standard
ASCII character codes.
b. Remote Control Device.
Any remote-control device (terminal, receiver control panel, etc.) which generates and
accepts the standard ASCII asynchronous format may be used to control the Receiver.
NOTE
Due to the wide variety of
p~ssible
control devices,the
discussion on remote control commands addresses ASCII
characters rather than on specific control pushbuttons, keys,
or switches. Similarly, the discussion on RA6790/GM HE
Receiver iesponsestoremote~con trol commands addresses ..
the ASCII characters sent back to the controller,ratherthan
on specific displays generated by the receipt of those responses.
c. Input/Output Electrical Interface.
The input/output electrical interface consists of the A6AI serial asynchronous interface
assembly which connects to the remote control device throu.gl1 the A6Al WlJ 1 Connector
(type M83723-02R-1626N) on the receiver rear panel. The interface, which provides
separate lines for command input and monitor output data.- allows up to ten
(10)
Receivers
to be placed on a common. parallel, input/output bus. The command receiver meets the
specifications of RS423, RS422 and MIL-STD-188-114, and is also operable with MIL-STD-
188C or RS232 compatible remote con trol devices. The monitor transmitter meets the
specifications of RS423 and MIL-STD-188-114. and is operable with MIL-STD-188C or
RS232 compatible devices and may be strapped for RS422 unipolar operation. Interface
selection, receiver address baud rate selection. and parity odd/even selection wiring
instructions are discussed in Section II, Paragraphs 2.3.3.2 and 2.3.4.6.
3-19
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