Selecta VACIOTEM-T - Safety Thermostat; Rs-232 Communication

INSTRUCTION MANUAL CODE 80152 REV E DEC 2019 (They can be modied without notice) Page: 27
J.P. SELECTA s.a.u. Ctra. NII Km 585.1 Abrera 08630 (Barcelona) España Tel 34 937 700 877 Fax 34 937 702 362
e-mail: selecta@jpselecta.es - website: www.grupo-selecta.com
SAFETY THERMOSTAT
Vacuum ovens Vaciotem T and Vaciotem TV are equipped with
a safety thermostat (31) which prevents that heaters temperature
never reach at dangerous levels.
Never change the thermostat adjustment. It could cause unexpected
stops of drying processes.
Thermostat have a reset push button (32) that allows to let the
equipment ready to work elapsed some time. Nevertheless, if
thermostat disconnects many times the process, user should call
up to technical service.
RS-232 COMMUNICATION
RS-232 COMMUNICATION OVERVIEW
•  9600bauds,7datbits,1bitstop,withoutparitynohandshake.
•  Upto15mofcable.
•  CableconectionDTEtoDTE9pinsmale.
•  ProtocolASCIIwithLRCagainsttransmitionerrors
•  MASTER-SLAVECommunication(PCcomputerasamaster).
•  Thedeviceneversendsanythingifcomputerdoesnotaskfor
it.
Start frame Address Data LRC End frame
# N N K K CR LF
H L Message (n bytes) H L
Start frame # = ASCII (23) 1 byte
Address NN = 01...99 2 bytes
Data Message = Command + arguments n bytes
LRC KK = 00..FF 2 bytes
End frame <CR><LF> = ASCII (0D)+ASCII (0A) 1 byte
•  Messagesstartwithcharacter#.
•  Deviceaddressmustbeincluded.
  Thiseldgoesfrom00to99,sizealways2bytesindecimal-
ASCII format.
•  Dataeldisthemessage.
•  LRCisacalculatedvaluetocheckgoodtransmission.
•  AttheendoftheframealwaysaCR(0D)followedbyLF(0A).
•  Slavedeviceanswersalwaysbysendingitsaddress.