30058 Parallax Inc, 30058 Datasheet - Page 20

• Manufacturer Part Number: 30058
• Description: SER LCD 4X20 W/KEYBRD INTERFACE
• Manufacturer: Parallax Inc

Specifications of 30058

• Interface: Serial
• Display Type: LCD - Monochrome
• Display Mode: Reflective
• Viewing Area: 82.20mm L x 18.20mm W
• Backlight: LED - White
• Character Count X Line: 20 x 4
• Module Size (w X H X T): 98 mm x 60 mm x 27.5 mm
• Voltage Rating: 4.75 V to 5.25 V
• Operating Temperature Range: 0 C to + 50 C
• For Use With: 27963 - SOLUTIONS CUBED: MEMKEY
• Dot Size: -
• Dot Pitch: -
• Dot Pixels: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q2089249

3.2 The display module is not communicating.
3.3 The display module is communicating, however text cannot
4 Communications
4.1 Introduction
port.
4.1.1 I
single I
Matrix Orbital
The commands listed in this chapter describe how to configure data flow on the RS232/TTL and I
The LK204-25 is capable of communicating at 400 Kbps in I
see 14.5 on page 60 for contact information.
First, check the communication cable for continuity. If you don’t have an ohm meter, try using a
different communication cable. If you are using a PC try using a different Com Port.
Second, please ensure that the display module is set to communicate on the protocol that you are
using, by checking the Protocol Select Jumpers. To change the protocol used by the display module
see Section 2.3 on page 11.
Third, ensure that the host system and display module are both communicating on the same baud rate.
The default baud rate for the display module is 19200 bps.
If you are communicating to the display via I
address. The default slave address for the display module is 0x50.
Finally, you may reset the display to it’s default settings using the Manual Override Jumper, see
Section 2.6 on page 13.
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.
2
be displayed.
NOTE I
NOTE Optimal contrast settings may vary according to factors such as temperature, view-
ing angle and lighting conditions.
If you are unable to resolve any issue please contact Matrix Orbital. See 14.5 on page 60
for contact information.
C communication line. However, in order to communicate via I
2
C Communication
2
C communication will always require pull up resistors.
LK204-25
2
C please ensure that the data is being sent to the correct
2
C mode, with 127 units addressable on a
2
C you must first set the Protocol
2
16
C