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Helix Main Board
Assembly and Setup Manual
20
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Final Assembly of the Main Board
It is time to install all of the ICs and other components. Make sure they are installed in the correct orientation and
that all of the pins are firmly seated in the sockets. There is a dot next to pin 1 or an indention at the top of the IC
chip that identifies orientation. This dot or indention needs to be aligned with the indention on the socket. It often
helps to lay the chip on its side on a table and carefully bend all of the pins in toward the center of the chip before
trying to insert it into the socket.
Final Assembly Steps
Step Done Ref #
Value
Orientation
1
IC1
(RTC)
Notch Up (Not needed on a Network Node MB)
2
IC2
24LC256-I/P 32kx8 bit I2C
Notch Up (Supplied with board but not installed)
3
IC3
H11AA1M AC Optocoupler
Notch to the Left
4
IC4
SN75174NE4 Quad
RS422/RS485 Driver
Notch to the Right
5
IC5
SN75174NE4 Quad
RS422/RS485 Driver
Notch to the Right
6
IC6
SN75174NE4 Quad
RS422/RS485 Driver
Notch to the Right
7
IC7
SN75174NE4 Quad
RS422/RS485 Driver
Notch to the Right
8
IC8
Propeller 32 bit
Microcontroller
Notch Up
9
IC9
MCP23016 I/O Port Expander
Notch to the Right
10
IC10
ST485 RS485 TX/RX Port
Notch Up
13
RF1
XBee Pro Radio
Outline of the radio should match the outline on the
silkscreen
14
MP3
MP3 Player
If this is a Network Node MB then skip this step. Align Vin
and GND markings on the MP3 player with Vin and GND
markings on the silkscreen. See Picture 10.
15
Heat Sink for 5V Regulator
Apply a little heat sink compound to the back side of the
TO-220. The heat sink slips on the TO-220 package very
snugly. Should be inside of the outline on the silkscreen
16
Heat Sink for the 3.3V
Regulator
Apply a little heat sink compound to the back side of the
TO-220. The heat sink slips on the TO-220 package very
snugly. Should be inside of the outline on the silkscreen
17
Battery for RTC
If this is a Network Node Board then skip this step. Install
the CR2032 coin cell in the RTC battery holder. The + side
of the battery should face toward the top of the board.
18
Headers 3 and 4
Install the shunts (jumpers), Mouser part #151-8010-E, on
Headers 3 and 4 between the top two pins on each
header. See Picture 11.
19
Header 7 RS485 Termination
Resistor
If this will be the first board (a Helix Network Controller)
or the last board in an RS485 network then install a shunt
on Header 7
Headers 8 and 9 RS485 Fail
Safe Termination Resistors
If this is a Helix Network Controller then install shunts on
Headers 8 and 9