DESIGN PARAMETERS OF ON-LINE MEASURING EQUIPMENT OUTPUT

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001800110034-4
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 8
• Document Creation Date: December 28, 2016
• Document Release Date: September 18, 2002
• Sequence Number: 34
• Content Type: SUMMARY

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DESIGN Pte' WM OF ON-LnM MEASURING EQUIPMENT OUFPU
1. PURPOSE. The purpose of this paper is to outline the design
parameters for developing a direct communication link between coordinate
measuring equipment and a central computer on a real-time basis.
2. SCOPE. Transmission between the computer and the remote station
is to be via two twisted pair of standard 18 or 20 gauge telephone quality
lines. Adequate steps have been taken to insure minimum interference from
outside sources. One pair of transmission lines, commencing at the
central computer site, is to be connected to a page printer. The contractor,
however, is to have no responsibility for the printer. except for consideration
of placement within the operator's immediate control.
STATINTL
The second pair of lines to the computer is to be connected,to
the measuring equipment digitizing system through a pair of
II
Data Phone subsets, model 202B lists 1, 3, A, a4d B. One Data"-.
Phone will be located at the computer room, and the contractor is to have
no responsibility for this unit. The second Data Phone is to be mounted ;
In the digitizing system, and the contractor is responsible for providing
the necessary interface connection. In all cases, the customer will be
responsible for providing the Data Phones and Printers. For the purpose
of this paper, the measuring equipment and digitizers are understood to
consist of (a measuring engine, pulse generators pulse decoding system,
digital accumulators, buffer storage as requiredand circuitry for generating
special characters as later explained. There is to be no data connection
between the printer and digitizer except through the computer link.
DECLASS REVIEW by NIMA/DOD
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3. TRANSMISSION INTERFACE. The Data Phone interface is to meet the
following requirements:
a. Electronic Industry Associates (EIA) specifications to which
the Data Phone was built. It is currently EIA-RS 232, but should be
checked prior to final design for any changes..
b. Data Phone to operate in the half duplex mode.
c. Transmission is asynchronous with the rate of transmission
to be fixed at 1200 bits per second + 1% tolerance, and is binary
d. A voltage within -8 to -20 rWesents off or marking (1),
voltage within +8 to +20 represents on or spacing (0).
e. In addition to the information bits to be transmitted, two
pulsing bits must be transmitted for each character. A start pulse is
a space or (0) and is the same duration of the other bits. A stop
pulse is a mark or (1) and is a minimum of 1.5 bits in length but
may be longer.
CODE REQt1IR~NfEI+N'S. The code to be transmitted will meet the
following requirements:
a. Code to be used will be Field Data Code, consisting of a
6-bit character plus one parity bit. Parity is to be odd.
.b. The 20 or least significant information bit is the first
bit to be transmitted from each character.
c. Parity is to be the 26 bit and is the last information bit
of each character to be transmitted.
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5. MESSAGE Gi"MAT. D. The message to be genera ed by the measuring
equipment system shall consist of: (See aapendix A for output sequence.)
a. Digital coordinate values for each axis of the system. This
shall normally consist of s/* decades plus sign per axis.
b. A start of mess a character ~ISOM) .
c. An end of transmission character (Er). (This bit configura-
tion would normally be a parity error).
d. A message parity count (Nc). This is the sum of bits of all
characters transmitted (including SOM and ]X)T), and is non carry add.
Lateral parity is odd. Longitudinal parity is even. The parity bit
is to be the sum of the longitudinal. parity bits.
e. Four special instruction cba ecters, each generated by four
operator controlled push on, push off back lit switches, two dui
bits (mark or 1), and a parity bit generated by the equipment based
on the condition of the four switches. The fixed dummy bits will occupy
the 22 and 25 bit positions.
f. A special readout character generated by five momentary
contact push button switches and two fixed dui bits occupying the
25 and 26 bit positions. The dummy bits are to be spaces or O's.
It is understood that the parity (26) is to be fixed at 0 so that
if two of the five switches are pressed at the same time, a parity
error will be detected. The five switches are to be understood as
readout switches and will also control the request to send, SCM and
text as later described.
g. Three rotary switches are to be provided for machine
identification purposes. These switches are to have th& capability
to 'create 0 to 9 and are to be placed in the equipment so that only
the maintenance engineers will have the, capability to change them.
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ition ~?o ary si.:c - a
s
l
re? pa
twe=
h. A mi.ni.max f 12p
-4vi tche&s are to have the capability of producing 0 to 9, minus
er, :SOT.
S. I14L CI ?CUITSd~ There is to be no character by char tezr
acknawledge signal received by the digitizer output circuit. However,
there is to be a message acknowledge or error signal received on the basic,
of the total message transmitted. The reply will consist of SCM, A or E,
:ACT, and C. In addition, a timer is to be incorporated in the equipment
rigger an alarm if the reply is not received in a predetermined time to
spec, if'ied by the customer. The output is to be held in the digitizer
until an acknowledge is received or the timer alarm is triggered.
fV are error signal is received glue to a bed transmission, the timer is tc
e, reset and another attempt at transmission is to be made. After a set
.-imber of attempts of retransmission (under computer control), an acknowledge
or error signal will. not be returned and the timer will time out. If a read.
.-:trt is initiated but never reaches the computer, the timer viii aloo time
warning the operator that the transmission is not taking place, Since
l the Data Phones are to be operated in the half duplex mode, the return
e c:knowledge or error must pass over the seine lines and will not be 4srann
n: ted until the digitizer transmission is completed and the like phase
tlatianship is reversed.
In addition, an indicator light is to be placed on the control
pcme)- in close ,oximity to the readout switches. On depressing any one
u.-. the five readout switches the light is to turn on and remain on for
)proximately one second or until an acknowledge signal is received, which-
-q
is longer. This will indicate to the operator that a readout tars
been initiated within the digitizer.
5EE. A-Mm'b,x -i~ 17,qeweRj?v ---
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 0 Approved jeeic s 1 c . 1thCIA -oo in tie 7 y7st shou.7d 4v laces
c- i, t 1--e n e ls,.tring engine. within the opex v orr s field of view. p reset hx t?t.on
a eh . zs shall be placed on the control. It is also 1=#'Ql
ths: a master .ceaet button be provided and a manual. set few;ure
for c.tach decade o" the, counter to give the operator the a:..)iii.ty to set the
eour.?ir:er value to a prr determ-! nad value other than zero. Or
7. Er U) N ', Or, OP: RATIMS. Having. properly set up the merr:_arin,
ecul-pment as inst., acted, the operator will procede to take measurements
a t, ::has transmit data. Prior to actuating. the readout mechaiism he
sE x ,c -the ueee cs n-y computation instructions on the 16 posh -)n. off
c_.Witc ;s:v COmJ
rising; Vac. four :_nstruction characters. Then, on aliaiag the,
,enee mark. Sri ?.;h the image he will de-preas one of the :Five r : e~. ?out
::, :, i4 vhes couprising the readout charactee.
?:xc actuating one of the five readout switches, the d=g5.tiztnfr
3 .s.t .-r will set the timer, energize the readout indicator lig-it, mil epp;J v
the ix=quest to sex;4 signal to the Data Phone. On receipt of the clea:c to
tend, the bit by bit tre sage will be fed to the Data Phone as in :>_catei In
A pendix A.
lk ter seg.*ding the message., the digitizing system will await the
ack caowle(. {4 a or error signal. If all ackn43wledge signal is received, the
buffer storage will be released and ready to accept the next readout. If
.n error signal is received, the above procedure is repeated t, including
:-::e,:et _n,., the timer and readout light) sending the identica was, e. After
9a.se? nurier of tries under computer control, neither an acknowledge or
error signal will be sent to the digitizing system from the computer Fu-id the
timer will time out, energizing an audible alarm indicating that transmission
had not been successful. Also i:' the Data. Phone lines fail to set up, the
timer is to time out giving an alarm. When an alarm occurs, the operator
the
Approved
13 -re*t-rans-
or :y;i z or call maintenance.
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1. When only the electronics are under consideration the design for the
pulse decoding system should include individual plug-in printed circuit boards
for a variety of pulse generators. Specific requirements exist for input cards
for I Isystems.STAT
However, final design should not preclude additional future inputs.
2. In addition to the readout mode described in paragraphs 5 and 6,
a requirement also exists for a second readout mode on an optional basis. The
second mode shall consist of sufficient circuitry to receive parallel informa-
tion from a binary data block reader and transmit same to dataphone. The mes-
sage shall consist of SOM, up to 150 binary bits, the 3 machine identifier
characters, BOT, and MPC.
3. An operator controlled set of switches shall be available for each
decade and sign for introducing an automatic preset value. They shall consist
of 10 position switches for each decade and 2 position switches for the sign.
Two position direction of count, and axis selection switches shall also be
included. The above switches shall be under operator control but should not
be placed on the main control panel.
4. Required performance and critical output timing demand maximum
reliability and rapid maintenance. Where possible, all circuitry should be
on plug-in printed circuit cards with a minimum .number of types used. While
mil specs are not specified, design should be of the highest possible conmercial
standards to insure maximum performance.
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APP'E'NDIX C
SEECIFICATI0 +1S
Maxim= Count Rate: 100 KC, 50 KC for readout on the fly.
Maximum Storage
Number of Axis
Numerical Display :
Circuitry
Output
Identification
Capacity
Special Features :
Special Output :
Control Placement :
Power Requirement :
! 999999 counts each axis.
In line (Nixie or 1' projection type) Negative numbers are
to be displayed as true numbers (not 9s complement).
Completely solid state.
Binary serial 1200 bit per second } 1%.
SOU, Readout character, 4 instruction characters, 3 machine
identifier characters, 12 twelve position rotaries.
(see text)
Dependent on input.
Operator controlled switches to allow any value within
range of counters to be set in counter by depressing
reset button.
Direction of count toggle switches and axis interchange
toggle switches.
Mode 2 output available as optional feature.
The numerical display, identification capacity.. and reset
buttons are to be designed for remote placement. The preset
controls and special features switches are to be mounted in
an accessible manner on the main chassis.
100 - 125 volts, VO cycle.
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