Service manual

EXTERNAL SERIAL CONTROL PROTOCOL
B-14
April 2001
Part No. 001-9800-203
Data:
0x00 = Same as DATA PTT input line
0x01 = Same as DATT PTT REVERT input line
(see Section A.3.3).
EVENT DISPLAY UPDATE
Function
: This is a command to update the current
user interface indicators (LCD icons and LED indi-
cators) and alpha display lines. Embedded sub-
opcodes control alphabet, scroll, and blinking
modifiers.
External Device/Subscriber Unit Action
: The indi-
cated display field or field control must be updated
on the display of the destination device. Some
device displays may not be capable of particular
subcodes. Such messages are then ignored.
Origin
: Any device on bus
Data
:
Message structure: The DISPLAY UPDATE
opcode is followed by a one byte subcode field
and 0 or more bytes of data. Each update
message can contain only one subcode
instruction.
CLEAR CHARACTER FIELD
Function: This message clears the image in one
specific ASCII field.
Device Action
: Clear the indicated display field.
Format
:
Data
:
0x01 - blank alpha line 1
0x02 - blank alpha line 2
0x00, 0x03-0xff - reserved
CURSOR POSITION CONTROL
Function: This message controls movement and
application of the cursor character on the alpha-
numeric display.
Device Action: Update the cursor location or on/off
status.
Format:
Data:
0x00 - reserved
0x01 - 0x10 position cursor at the indicated
character position 1-16 (position 1 = line
1 left most character, 16 = line 2 right most
character)
0x11 - 0xff - reserved
CURSOR UNDERLINE CONTROL
Function: This message controls application of the
underline cursor on the alpha display.
Device Action
: Turn ON or OFF the underline
cursor status.
Format
:
Data
:
0x00 - disable underline cursor
0x01 - enable underline cursor
0x02 - 0xff - reserved
Opcode Subcode Data Field
1 byte 1 byte Variable bytes
0x07
Subcode Data
Clear Character Field 0x01/0x02
0x20
Subcode Data
Cursor Position 0x01 - 0x10
0x11
Subcode Data
Underline Action 0x00 - 0x01
0x12