WJ-8611 DIGITAL VHF/UHF RECEIVER
4-2 REMOTE
CONTROL
The data word frame used for serial data transfer is fixed at ten bits. It
consists of one start bit, eight data bits, and one stop bit. No parity bit is
used.
4.1.2 IEEE-488 PARALLEL INTERFACE
The IEEE-488 interface (J2) provides parallel interfacing with up to
fourteen other devices on the bus. It provides talk and listen capabilities
between the receiver and the controlling device in a bit-parallel, byte-serial
form. Sixteen interconnecting lines and eight ground shield lines form the
interface. These lines consist of eight bi-directional data lines, three data
byte transfer lines, and five bus management lines. Data and address
information is transferred over the data bus lines (DIO 1-DIO8). The three
data byte transfer lines (DAV, NRFD, and NDAC) indicate the availability
and validity of the information of the data bus lines, the readiness of the
listening device to accept data, and when the data has been accepted. Four
of the five management lines are used to indicate when the data bus is
carrying data or address information (ATN), to request service (SRQ), to
clear the interface (IFC), and to indicate the end of a transfer sequence
(EOI). The fifth management line (REN) is not used in this configuration.
The IEEE-488 interface provides the receiver with talk and listen
capabilities, when commanded by the controlling device. Through the
interface, the receiver can initiate a service request (SRQ) and reply to a
serial poll initiated by the controller. It can respond to a selected device
clear (SDC) and a universal device clear (DCL).
In order to communicate over the IEEE-488 interface, the receiver must be
set to a unique bus address. To avoid bus conflicts, no other device on the
bus can share the same address. The available addresses for IEEE-488
operation are from 1 to 30. The address is set by a DIP switch on the
receiver’s Digital Assembly. Refer to
paragraph 2.2.1
for details on
setting the bus address. Additionally, the capability of setting and
changing the bus address from the front panel is provided. Refer to
paragraph
3.2.9
.
4.2 COMMAND MESSAGE FORMAT
Command messages for the WJ-8611 Receiver are exclusively ASCII-
encoded data, consisting of command headers and arguments. The
command headers consist of three character mnemonics. The arguments
associated with the command follow the command in a “forgiving” format
(nrf). All queries to the receiver consist of a command header, followed
by a question mark (?).
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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