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SECTION 5 - SERVICE
Serial Data Ports
Microboard 031-03630-007 is equipped with 6 serial
ports. Each port is dedicated for a specific function as
follows:
A. COM1 (J2) – RS-232. Printer.
B. COM2 (J13) – RS-485. Modbus communications
to the Primary Liquid Cooled Solid State Start-
er, Medium Voltage Solid State Starter, Medium
Voltage Variable Speed Drive or Variable Speed
Drive.
C. COM3 (J12) – RS-485. LTC I/O and Motor Moni-
toring.
D. COM4 (J2) – RS-232. SC-EQ communication
card.
E. COM5B (TB4) – RS-485. Future VGD actuator.
F. COM6 J29 & J30 Fiber Optic cable to LCSSS.
Each port is equipped with two LED's. A red TX LED
illuminates as data is transmitted to or requested from
another device. A green RX LED illuminates as data
is received from another device. The RS-232 voltages
are industry standard +5 to +25VDC and -5VDC to
-25VDC logic levels. The RS-485 voltages are industry
standard 0VDC and +1.5VDC to +5VDC logic levels.
A diagnostic test can be performed on each serial port
to confirm proper operation. Refer to Diagnostics Sec-
tion of Form 160.54-M1 for details.
The LED's and their functions are as follows:
• CR41 RX1 – COM1 serial port receive data.
• CR42 TX1 – COM1 serial port transmit data.
• CR40 RX2 – COM2 serial port receive data.
• CR37 TX2 – COM2 serial port transmit data.
• CR38 RX3 – COM3 serial port receive data.
• CR35 TX3 – COM3 serial port transmit data.
• CR39 RX4 – COM4 serial port receive data.
• CR36 TX4 – COM4 serial port transmit data.
• CR44 RX5B – COM5B serial port receive data.
• CR43 TX5B – COM5B serial port transmit data.
• CR48 RX6 – COM6 serial port receive data.
• CR46 TX3 – COM6 serial port transmit data.
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Display Interface
The graphic screens displayed on the Liquid Crystal
Display are created from the program downloaded from
the Program card and stored in the Flash Memory Chip.
The data to form these screens is output from J5. This
data is in the form of red, green and blue drive signals
applied to each of the 303,200 display pixels arranged
in a matrix of 640 columns x 480 rows. Each pixel con-
sists of 3 windows; red, green and blue, through which
a variable amount of light from the Display Backlight,
is permitted to pass to the front of the display. The drive
signals determine the amount of light permitted to pass
through each window. The overall pixel color is a re-
sult of the gradient of red, green and blue light allowed
to pass. The drive signal for each pixel is an 18 bit bi-
nary word; 6 for each of the 3 colors. The greater the
binary value, the more light is permitted to pass. The
pixels are driven sequentially from left to right, begin-
ning with the top row. To coordinate the drive signals
and assure the pixels in each row are driven from left
to right and the columns are driven from top to bottom,
the drive signals are accompanied by a clock and hori-
zontal and vertical sync signals.
During the boot-up, the program in the FeRAM reads
wire jumpers PID0 through PID3 on the Display In-
terface Board to determine the manufacturer of the
display. Each display manufacturer requires a slightly
different control. The program in the BIOS EPROM
configures the microboard for correct operation for the
actual display installed.
Different display manufacturers require different sup-
ply and control voltages for their displays and back-
lights. Program Jumpers JP2 through JP5 and JP7 and
JP8 must be configured to provide the required supply
and control voltages to the display and backlight con-
trol. A label attached to the display mounting plate lists
the required program jumper configuration for that dis-
play. The position of program jumper JP2 determines
whether the supply voltage is +5VDC or +3.3VDC.
The microboard controls the Display Backlight via J6.
The Display Backlight is the light source for the dis-
play. The Backlight Inverter Board (FL Backlight Dis-
plays) provides a high voltage AC power source for the
lamp. It converts low voltage DC via J6-1 (+12VDC
or +5VDC, depending on position of Program Jumper
JP5) to high voltage AC (500 to 1500VAC). This high
voltage AC is applied to the lamp to cause it to illu-
minate. The Backlight is turned ON and OFF with the
"Backlight Enable" signal (J6-5). The position of Pro-
gram Jumper JP4 determines whether this is a +12VDC
FORM 160.87-OM1
ISSUE DATE: 8/24/2018
JOHNSON CONTROLS
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