Data Interface - Optoelectronics M1 Owner's Manual

CONTROLS
Backligh t Instructions Continued
FiUn Mode Filter function is
on and Capture
is
turned
off
The ABO feature will
tum
off the backlight ten
nO)
secondsafter
the
last function
change has been made. or any frequency activity.
Capture Mode Filter function is
00.
and
Capture
is turned on
The ABO
featurewill tum
offthe backlight ten nO)secondsafter
the capture
featurehas beenarmed. Thebacklightwill only rome on
when
a functioo. change.
rearmingcapture
rrode,
or a frequency has been captured.
Captured
Frequmcies
Vif'Wi ng Mode RIterfunction
is
offand
Capture is turned on
The ABO feature will tum
off the backlight ten
(10)
secondsafter the changingof
the memory Iocatioos. The backlight
will only rome on with a function
change.
NOTE:When the backlightinverter
is
powered
on
there
may be a low levelaudible
to....
DATA INTERFACE
GENERAL
The MOOeI Ml HandiCounrera is equipped
with
a TIl asynchronous serial
interfacewhichallows
the
unit
to
be
conrected
to a personal computer for the
purJU'oe of reading
frequency
information.The three-wireinterfaceis accessible
via
a miniature stereophonejack,and consistsof Receive Data
(lIP),
Transmit Data
(RING), and Signal G round(SHIELD). An external RS-232C InterfaceConverter
(Mooel CXl2)is
required
to convert the TIl signal levels
to
RS-232C levels
compatible wi th most persona l computers.
ELEcn UCALSPECIFICATIONS
The following electric al parameters are specified relative
to
Signal Ground
(SHIELD).
Receive Data
(TIP)
LOGI C "0",0 -0.7 Vdc (50uA max.load current)
LOGIC"1",2.0-5D VDC(50uA max. load current)
Transmit Data (RING)
LOCIC"0":0-0.45 Vdc (l.6 mA max.sinkcurrent)
LOGIC"}": 2 4-5.0 VOC(60
uA
max.sourcecurrent)
DATA INTERFACE
COMMUNICATIO NS PARAMETERS
The followingcommunkatons parametersare used for both Receive Data
(TIP)
andTransmit Data (RING) .
Data Rate 4lI(lbps{+/-2%)
~rtBits:
1
Data Bits : 8 Parity. NONE
Stop
6;15' 1
OATA PRartlCOL SPEOFICATIO" S
In
order
to
read frequency information from the ModelMI. the host computer
must send an ASCllCarriag e
Return <CR>
character (ODH.or 130) to
the
counter
via
the ReceiveData
(J1P)
signal .
The counter will then respondby sending
eIevm ASCD
characters
to
the
hostcomputer
via the
TransmitData
(RING)
signal.corresponding
to
the most
recent successfulcounter
mmswement.
The elevencharacterswillconsist d the
tm-digit
count, plus an ASCD Period <>
character(2EH, or 460) to mark the
position
of
IN!decimal point. Leadingzeroes
of
the counterresuHare blanked by
replacingthem with A5CD
Space <SP,
characters (20H, co
320) .
Strlht ro>mp/ts
bdow.
Gate time Measured frequency Serial interfaceoutput
om
S 52.500 MHz <SP><SP><SP><SPx5><2><.><5><ll><tl><O>
0.15 146.750
MHz
<SP><SP><t ><4><h><.><1><5><O><O><O>
1
n
S ~32595 MHz <SR><9><O><B><.><3><2><.5><9><5><O>
10.05 444 .975
MHz
<4.<4,<4,<..<9,<7 ,<5,<0 ,<0,<0 ,<0 ,
The data received from the serial interfaceis only valid when the FREQUENCY
functionis selected. If thePERIOD, lNfERVAl.,. or RA110 function is selected,the
serial interfaceoutpul: data
is
meani n gless. In NORMAL mode,the serialinterfa ce
output data represents the
most
recent
frequency
measuremen t. When FILTER
mode is selected, the serial interfaceoutput data represents the most recen t
frequency measurement which passed the filter. Wheneither CAPlUREmode or
RECALL mode is selected, the serial interfaceoutput data represent s the most
recen t lycapturedfrequ ency .