Matrix Orbital PK162-12 - Manual (Page 21)

Description This command sets the RS-232 port to a non-standard baud rate. The
command accepts a two byte parameter that goes directly into the mod-
ules baud generator. Use the formula, speed =
CrystalSpeed
8×DesiredBaud
− 1 to cal-
culate the [speed] for any baud rate setting. The speed can be anywhere
from 12 to 2047 which corresponds to a baud range of 977 to 153,800
baud. Setting the baud rate out of this range could cause the display to
stop working properly and require the Manual Override jumper to be set.
Remembered Always
Examples
Crystal Speed 8 Mhz
speed =
crystalspeed
8 ∗ DesiredBaud
−1
speed = 74.07 − 1
speed =
8, 000, 000
8 ∗ 13, 500
− 1
speed = 73.07
• LSB = 0x4A (rounded)
• MSB = 0x00
• Inteded Baud Rate: 13,500 baud Actual Baud Rate:
8,000,000
8(73+1)
=13,675 Percent Difference: 1.8%
NOTES
• Results from the formula are rounded down to the nearest whole number (73.07 =
73).
• This formula becomes less acurate as baud rates increase, due to rounding.
• Place the speed result backwards into the formula to receive the actual baud rate.
(Baud =
CrystalSpeed
8(speed+1)
)
• The actual baud rate must be within 3% of the intended baud rate for the device to
communicate.
5 Text
5.1 Introduction
The PK162-12 is an intelligent display module, designed to reduce the amount of code necessary to
begin displaying data. This means that it is able to display all characters and strings that are sent to it, which
are defined in the current character set. The display module will begin displaying text at the top left corner
Matrix Orbital PK162-12 17