INSTRUCTION MANUAL CODE 80152 REV E DEC 2019 (They can be modified 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: [email protected] - 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
= C 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 field goes from 00 to 99, size always 2 bytes in decimal-
ASCII format.
• Data field 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.
