Matrix-orbital VFD2041 Instrukcja Użytkownika Strona 22
- Strona / 53
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Oceniono. / 5. Na podstawie oceny klientów
3.3 The display module is communicating, however text cannot
be displayed.
• A common cause may be that the contrast settings have been set to low. The solution to this problem
is to adjust the contrast settings. The default setting that will work in most environments is 128.
NOTE Optimal contrastsettings may varyaccordingto factors such as temperature, view-
ing angle and lighting conditions.
If you are unable to resolve any issue please contact Matrix Orbital. See 12.5 on page 49
for contact information.
4 Communications
4.1 Introduction
The commands listed in this chapter describe how to configure data flow on the VFD2041.
4.1.1 I
2
C Communication Summary
The VFD2041 is capable of communicating at 100 KHz in I
2
C mode, with 127 units addressable on a
single I
2
C communication line. However, in order to communicate via I
2
C you must first ensure that pull up
resistors, with a nominal value of 1K to 10K, are placed on the SCL and SDA communication lines coming
from pins two and three of the Data / Power Connector respectively. Data responses by the module are
automatically output via RS232, in case the host will be querying the module, it is necessary for the host
to inform the module that its responses are to be output via I
2
C. This can be done by sending command
254 /160 / 0 to turn off auto transmission of data in RS232. This will keep the data in the buffer until the
master clocks a read of the slave. The I
2
C data lines operate at 5V normally or 3.3V for -1U style units. The
VFD2041 uses 8-bit addressing, with the 8th or Least Significant Bit (LSB) bit designated as the read/write
bit, a 0 designates a write address and a 1 designates a read address. The default read address of the display
module will be 0x51, whereas the write address is 0x50 by default. This address may be changed by using
cmd 254 / 51 / <address>. The VFD2041 should only be sent addresses that are even (LSB is 0). When the
I
2
C master wishes to write to the display, the effective address is $50 (0101 0000) , since the LSB has to be
0 for an I
2
C master write. When the I
2
C master wishes to read the VFD2041, the effective address is $51
(0101 0001), since the LSB has to be 1 for an I
2
C master read.
If we take a standard Phillips 7 bit address of $45 (100 0101), Matrix Orbital’s VFD2041 would describe
this Phillips I
2
C address as $8A (1000 1010). The read address would be $8B (1000 1011).
The unit does not respond to general call address ($00).
When communicating in I
2
C the VFD2041 will send an ACK on the 9th clock cycle when addressed.
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
2
C transaction, each byte read from
the slave should be followed by an ACK to indicate that the master still needs data, and a NAK to indicate
Matrix Orbital VFD2041 18
- Technical Manual 1
- Revision: 2.1 1
- Contents 2
- 1 Getting Started 5
- 1.2 Accessories 6
- Figure 4: Breadboard Cable 7
- Figure 5: Serial Cable 4FT 7
- Matrix Orbital VFD2041 3 7
- Matrix Orbital VFD2041 4 8
- Matrix Orbital VFD2041 5 9
- 1.3 Features 10
- 1.4 Connecting to a PC 11
- 1.5 Installing the Software 12
- 2 Hardware Information 13
- Matrix Orbital VFD2041 11 15
- 2.2 Power/Data Connector 16
- 2.3 Protocol Select Jumpers 17
- Matrix Orbital VFD2041 14 18
- 2.4 General Purpose Outputs 19
- 2.5 Manual Override 19
- Matrix Orbital VFD2041 16 20
- 3 Troubleshooting 21
- 4 Communications 22
- C Transaction Example 23
- 4.1.3 Serial Communication 23
- 4.2 Changing the I 24
- C Slave Address 24
- 4.3 Changing the Baud Rate 24
- CrystalSpeed 25
- 8×DesiredBaud 25
- 5.2 Auto Scroll On 27
- 5.3 Auto Scroll Off 28
- 5.4 Clear Screen 28
- 5.6 Set Auto Line Wrap On 29
- 5.7 Set Auto Line Wrap Off 29
- 5.8 Set Cursor Position 29
- 5.9 Go Home 30
- 5.10 Move Cursor Back 30
- 5.11 Move Cursor Forward 30
- 6 Special Characters 31
- 6.3 Saving Custom Characters 32
- 6.4 Loading Custom Characters 33
- 6.6 Initialize Medium Number 34
- 6.7 Place Medium Numbers 34
- 6.8 Initialize Large Numbers 35
- 6.9 Place Large Number 35
- 7 General Purpose Output 37
- 7.3 General Purpose Output On 38
- 7.4 Set Startup GPO state 38
- 8 Display Functions 39
- 8.4 Set VFD Brightness 40
- 9 Data Security 41
- 9.3 Data Lock 42
- 10 Miscellaneous 43
- 10.2 Read Version Number 44
- 10.3 Read Module Type 44
- 11 Command Summary 46
- 11.3 Special Characters 47
- 11.4 General Purpose Output 48
- 11.5 Display Functions 48
- 11.6 Data Security 48
- 11.7 Miscellaneous 49
- 11.8 Command By Number 49
- 12 Appendix 51
- 12.3 Physical Layout 52
- 12.4 Definitions 53
- 12.6 Revision History 53
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