RayTek MARATHON FA - Response Time in Setup Mode

ProgrammingGuide
MarathonSeriesFA/FR 41
• SensorModelType
• SensorSerialNumber
• RelayControl
• Laserstatus
• Setpoints
• Deadband
• CurrentOutputMode(0‐20mAor4‐20mA)

Thefollowingitemscannotbepolled:
• Poll/BurstMode
• Baudrate
• Relaycontrol
• Setcurrentoutput

Anexamplestringforcommand$=UTQEGH<CR>
Thedefault
stringisasfollows:CT1250Q0400.023E1.00G005.5H1400<CR><LF>

9.4ResponseTimeinSetupMode
The analog output responsetime is not guaranteed whilea parameter value is being changed or if
thereisacontinuousstreamofcommandsfromthehost.
ThedigitalresponsetimespecifieshowquicklytheunitcanreportatemperaturechangeviaRS485in
burst mode. (Digital response time is not
 defined for polled mode.) The digital response time is
defined as the time that elapses between a change in target temperature and the transmission of a
burststringreportingthenewtemperature.Actualdigitalresponsetimecanvaryfromonereadingto
thenext,sothedigitalresponsetimeis
definedasthe“averagedigitalresponsetime.”

Theaveragedigitalresponsetimedependsonthenumberofcharactersrequestedintheoutputstring
andwiththebaudrate.Itmaybecomputedasthefollowing:

b
n
t
15000
9.9
⋅
+=

where:
t=averageresponsetimeinms
n=thenumberofcharactersinthestringincluding<CR>and<LF>
b=thebaudrate

Example:
Withabaudrateof38400,andanoutputstringcontainingtemperatureunits,2‐colortemperatureand
ambient(20characters),theaveragedigital
responsetimewouldbethefollowing:

mst 7.17
38400
1500020
9.9 =
⋅
+=


Notethat the analog output response time is notaffected by baudrate or the number of characters
transmittedintheburststring.