UNIVERSAL DIGITAL AND DATA INTERFACE
B-9
Revised May 1998
Part No. 001-9750-006
This serial bus is the same bus that is used for
transceiver programming and remote control. It is
available on the following connectors:
Universal Interface (J601) - TxD TTL U, RxD TTL U
Remote Interface (J600) - TxD TTL R, RxD TTL R
Microphone Jack (J2) - TxD TTL, RxD TTL
Flash Programming Jack (J405) - TxD TTL, RxD TTL
B.8.2 PHYSICAL SIGNAL PATH
The electrical characteristics of the signals which
implement the serial bus are described in the
preceding table. These characteristics apply to the
serial bus signals on all four connectors described in
the preceding section. The serial interface is a full-
duplex asynchronous serial port providing a standard
NRZ format at standard baud rates. Timing conforms
to the standard RS-232 protocol, but the levels are
TTL only.
B.8.3 CHARACTER LEVEL PROTOCOL
The character level protocol for data exchange
between the radio and an external device has the
following characteristics:
1. The character format is one start bit, 8 data bits, one
stop bit, no parity.
2. Transmission speed is 9600 baud.
3. No hardware or software flow control is used.
4. All data exchange is binary using a sync escape
protocol.
B.8.4 MESSAGE LEVEL PROTOCOL
General
The message level information exchange
protocol uses a variable length command and response
message structure. All commands and responses share
a common format. The following is a description of
the message elements.
Sync -
The first message character of each command
or response is a unique sync character (0x7E). If the
sync character or the escape character appear at any
other position in the message format, it must be
preceded by an inserted escape character (0x81).
Supervision -
The second character of each message
contains the command or response Supervision Type.
Length -
The third character is the message length of
the entire command/response message, not counting
the initial sync or any inserted escape characters that
must be sent for embedded sync/escape characters. The
checksum character is, however, included in the length
calculation. No message length can exceed 32 bytes.
Message -
The next block of characters is the event
message data which is sent to or from the radio. This
character block contains the event message and always
begins with an Event Type character. Each Event Type
is associated with a fixed format and length for the re-
mainder of the message data block.
Checksum -
The last message character is the two’s
compliment of the sum of characters of the entire mes-
sage. Excluded are inserted escape characters that must
be sent for embedded sync characters. A message is
considered complete when all the bytes have been
received.
Distinguishing Embedded Sync and Escape Charac-
ters
Figure 4 illustrates the encoding/decoding
process described in the preceding information. The
following example list shows how embedded sync and
escape characters are distinguished from the primary
use of these characters (see preceding “Sync”
description).
<ESCAPE> <SYNC> -
Embedded sync character in
the data stream. The first escape character is absorbed
and only the sync remains.
Sync
Supervision Length
Message
Checksum
1 byte
1 byte
1 byte
0 to N bytes
1 byte
Содержание Summit DM 975x
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