Remote Processing RPC-220 - Manual (Page 46)

TECHNICAL SPECIFICATIONS SECTION 15
Page 15-2
Interfaces to RP C P/ N 1723 char acter display. Contrast
adjustment provided.
Serial Ports
Type: RS-232
Ports: 2. One hardware from C PU, other is software.
Contr ol
lines:
Software lines may be used for RTS/CTS
control.
MECHANICAL
Size: 2.85" x 3.85"
Mounting: Mounting hole centers are 0. 150" from
each cor ner. Hole sizes a re 0. 125" d ia. in
0.250 pad. Use 0.250" standoffs for
mounting.
SHOCK AND VIBRATION
The RPC -220 board should withstand 5 g's r andom
vibration, 5 to 500 Hz if some m oderate amount of
precautions are taken.
Secure voltage regulator U10 to the board and/or heat
sink using a 4-40 or 6-32 nut and screw. The pad under
U10 is not c onnected to a ny signal. It is there to aid in
power dissipation.
U3 is plastic and has relatively little mass. It is not as
susceptible to shock and vibration as a ceramic chip. It
can be secured by using a nylon tie wrap around the
chip. Another m ethod is to carefully apply silicon
rubber to each end o f the chip and so cket.
The batter y is soldere d to the boar d. H owever , in
continuous vibr ation envir onmen ts the welds co uld
break. Metal fatigue is possible in the bands connecting
the battery to the board. You will have to put a non-
conductive p iece betwe en the batter y and IC under it.
Keep in mind that the clock and RAM draw micro-amps
of current. Any conduction between the + and - sides
of the battery drains it. Be careful of chemical adhesives
as they may initially draw a lot of current unit they cure.
Another way ar ound the batter y problem may be to
remove B1 and solder leads to jumper W7. W 7 is for an
external battery.
Secure the settings for the reference and contrast pots R4
and R9. T hese pots are relatively open, so a high
viscosity fluid should be used.
MOUNTING TO A MOTHER BOARD
The RPC-220 can plug into a "mother board" which has
power, signal and other functions on it. F igure 15-1
shows pin 1 connector locations. Mother board
connectors are dual row, female, on a 0. 1" x 0. 1"
matrix, for 0.025" square posts. Suggested connector
types are:
Manufacturer P/N and size
3M 929852-01-26 26 position
3M 929852-01-20 20 position
3M 929852-01-10 10 position
A M P 2-17314508 26 position
Oupiin 204-126GS PCB m ount, 26 pin
Oupiin 204-120G S PC B mount, 20 pin
Oupiin 204-110G S PC B mount, 10 pin
Samtec SSM se ries (sur face mo unt)
Samtec SSW, SSQ series (through hole)
Samtec ESW, ESQ series (elevated)
Samtec connectors come in a variety of plating and
lengths. Contact them at 800-726-8329 for more
information.
Maximum component height is 0.350". H owever, other
compo nents differ in height aro und the boar d. T ake this
into account when laying out your board.
Remote Pr ocessing can, on special order and in quantity,
put connectors on the circuit side of the board.