VK202-25-VPT Matrix Orbital, VK202-25-VPT Datasheet - Page 21

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VK202-25-VPT

Manufacturer Part Number
VK202-25-VPT
Description
VFD ALPHA/NUM DISPLAY 20X2
Manufacturer
Matrix Orbital
Series
VK202-25r
Datasheet

Specifications of VK202-25-VPT

Outline L X W X H
116.00mm x 37.00mm x 29.48mm
Viewing Area
89.75mm L x 11.50mm W
Display Format
20 x 2
Display Type
Character
Format
5 x 7 Dots
Voltage - Supply
9 V ~ 35 V
Character Size
4.70mm H x 2.40mm W
Interface
Serial
Operating Temperature
-20°C ~ 70°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Dots
-
When writing to the display module, the display will respond with a ACK when the write has successfully
been completed. However if the buffer has been filled, or the module is too busy processing data it will
respond with a NAK. When performing a multiple byte read within one I
the slave should be followed by an ACK to indicate that the master still needs data, and a NAK to indicate
that the transmission is over.
tions when writing I2C code:
sent (only needs to be sent once, so this can be done somewhere in init): 254 / 160 / 0 this command puts
the reply data in the I2C output buffer instead of the RS232 output buffer. Please note that due to a 16 byte
output buffer, query commands that reply with more than 16 bytes cannot be read (eg cmd Get FileSystem
Directory)
the possibility of using other built in graphic commands to clear areas of the display when refreshing all or
part of the display. For example, instead of sending the clear screen command, consider sending a rectangle
command with the proper size, this is much faster than clearing everything and re-drawing or writing spaces
over the area.
4.1.2 Serial Communication
RS-232 protocol at at a default baud rate of 19,200 bps and is capable of standard baud rates from 9600
to 115,200 bps. Furthermore the VK202-25 is also capable of reproducing any non-standard baud rate in
between using values entered into our baud rate generation algorithm and set through command 164 (0xA4).
The display module communicates at standard voltage levels of 30V to 30V or at TTL levels of 0 to +5V
by setting the Protocol Select Jumpers to TTL.
4.2 Changing the I
Matrix Orbital
The VK202-25 has some speed limitations, especially when run in I2C mode. Here are some considera-
* to be able to read the replies of query commands (eg. cmds 54, 55) the following command must be
* 3ms delay between the read commands
* 625us delay in between data bytes within a transaction is necessary
* 375us between transactions is necessary
Because of the considerable amount of delays necessary for I2C, it is suggested that the users explore
In addition to being able to communicate via I
Syntax
Parameters
Hexadecimal
Decimal
ASCII
Parameter
adr
2
C Slave Address
0xFE 0x33 [adr]
254 51 [adr]
254 “3” [adr]
VK202-25
Length
2
1
C the VK202-25 communicates natively through the
Description
The new I
0xFF).
2
2
C transaction, each byte read from
C write address (0x00 -
17

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