Industrial Electronic Engineers, Inc.
SIZE
A
CODE IDENT NO.
05464
S03875–06–0214
Van Nuys, California
SCALE N/A
REV A
SHEET 17
3.7
Self–test
The serial input display module can be operated independently from the host by using the "Self–test" option.
1. Check the multiplex jumper for proper setting (Section 4.2).
2. Connect a +5V power supply and potentiometer as discussed in Paragraph 2.1 and Figure 1.
3. Momentarily short the self–test line to GND (P2 pin 5 to pin 8).
4. All character positions should display the character "H".
5. The module can be stepped through the remaining test display frames by using the self–test line as
in Step 3 (above). The display will advance from frame to frame each time the self–test line is
momentarily shorted to ground. The remaining frames display: I, #, all pixels on, jumper settings in
HEX (with jumper #8 being the LSB, see Section 4.2), firmware version number, and then
resumption of normal operation.
6. Upon completion of "Self–test", the module is returned to the normal mode of operation with its
previous controller and data/instruction (RS bit) settings.
3.8
Diagnostics
1. The display module can be operated by the host in a HEX dump mode. This diagnostic mode
provides for the HEX display of all serial data received. While operating in this mode, the module will
ignore the multiplex jumper setting and operate the display in a 1/8 multiplex mode.
2. Check the module jumpers for proper baud speed and parity settings (Section 4.2).
3. With power "OFF" short the self–test line to GND (P2 pin 5 to pin 8).
4. While the self–test line is shorted to ground, apply +5 Volts to the display module. The self–test line
is now ineffective and may be allowed to float.
5. All serial data received will now be displayed in HEX. To return to the normal operating mode,
remove power, allow the self–test line to float, and re–apply power.
If a parity or framing error should occur, the most significant nibble of the HEX code will be displayed as:
HEX Code
Parity Error
Framing Error
0X
GX
gX
1X
HX
hX
2X
IX
iX
3X
JX
jX
4X
KX
kX
5X
LX
lX
6X
MX
mX
7X
NX
nX
8X
OX
oX
9X
PX
pX
AX
QX
qX
BX
RX
rX
CX
SX
sX
DX
TX
tX
EX
UX
uX
FX
VX
vX
X = Least significant nibble
* Characters with parity and framing errors are displayed as framing errors only. Framing errors can occur
due to loss of serial bit timing, improper baud rate and/or parity setting.
