GU-3900B series “General Function” Software Specification
4.6
Protocol
One of two protocols is selected by DIP-SW.
4.6.1
Direct mode
The module processes all received data; the display address setting is ignored.
Direct mode is applicable for all interfaces.
4.6.2
Packet mode
The module only processes data in packets with an address that matches the display's address set
by DIP-SW + MSW.
Using this mode, a maximum of 255 displays can be controlled individually.
Data in packets addressed to FFh is processed by all connected displays.
Packet mode is applicable for Parallel and RS-232 serial interface.
Header
Address
Data length
Data
Footer
BCC
STX (02h)
00h–FFh
01h–80h
00h–FFh
ETX (03h)
00h–FFh
1 byte
1 byte
1 byte
1–128 byte(s)
1 byte
1 byte
BCC: XOR value from Header to Footer inclusive.
Packet response can be sent, depending on MSW setting.
If packet address and display address matches, and packet is correctly received, ACK reply is sent
from display.
For packets addressed to FFh, only the display with address 00h sends a response.
If a BCC or other error occurs, no response is sent.
The packet response is sent with priority, which may corrupt any data remaining in the display's
transmit buffer, so the host should wait until all data has been received before sending the next
packet.
Response
ACK (06h)
1 byte
4.7
Commands
This section describes the operation of each command.
Within these explanations, Character (x-dot) and Line (y-dot) refer to the number of dots determined
by the “Font size select” and “Font magnification” settings, etc.
For commands that produce response data from the display, this data is placed in the send buffer,
then transmitted. When DSR=MARK (BUSY), data transmission is halted, and during any time when
there is no space in the send buffer, command processing is halted. Caution is needed when using
these commands via the parallel interface.
4.7.1
Code set
4.7.1.1
Character code
Command Name
Hex Code
Operation
Page
Character display
20h – FFh
or 2-byte character
code
Display character at the current cursor position.
p12
4.7.1.2
Control code
Command Name
Hex Code
Operation
Page
BS Back Space
08h
Cursor moves left by one character.
p15
HT Horizontal Tab
09h
Cursor moves right by one character.
p15
LF Line Feed
0Ah
Cursor moves down by one line.
p16
HOM
Home Position
0Bh
Cursor moves to home position (top left).
p16
CR Carriage Return
0Dh
Cursor moves to left end of the current line.
p16
CLR Display Clear
0Ch
Display screen is cleared, cursor moves to home position.
p16
CAN Line clear
18h
Current line is cleared and cursor moves to left end.
p16
RCLR Line end clear
19h
Current line is cleared from cursor position to right end.
p16
- 11
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