Brookfield Temperature Controller, Model 106 - Manual (Page 17)

Brookfield Engineering Labs., Inc. Page 17 Manual No. M/98-206-A0402
minutes were entered as a hold time, you would see 14 displayed as the time remaining if you
were to look at the hold time immediately after its start, and 0 if the hold time were in its last
minute.
While the Programmable Temperature Controller is ramping up (or down), you can also determine
the temperature setpoint for the next step by pressing the
SET key twice: once to view the next
setpoint temperature and once to see the programmed hÏlË hÏlË hÏlË hÏlË hÏlË time interval.
V.9 Stopping A Program
To stop a program that is presently running, simply press the RUN/STBY key. The PROGRAM LED
will be extinguished and the instantaneous temperature of the Thermosel Container will be displayed.
The Programmable Temperature Controller will display the setpoint temperature and step number for
the program step it was executing at the time the
RUN/STBY key was pressed.
V.10 Remote Operation
The Programmable Temperature Controller can be interfaced to an external device such as a personal
computer via the RS-232C protocol. The RS-232C cable (Brookfield Part Number HT-106) is used
to interface the two devices.
Appendix A contains a sample program written in the BASIC language to demonstrate the use of the
external control of the Programmable Temperature Controller. This program executes a temperature
program from 100
°
C to 200
°
C in 25
° C increments. At each setpoint, the temperature is maintained
for a period of 10 minutes. The program can be readily adapted to include additional temperature
setpoints and different time periods.
NOTES: 1) Only setpoint temperatures may be sent to the Programmable Temperature Controller
in the external mode. It is up to the PC program to keep track of any desired hold
times.
2) All previously stated temperature limits also apply to the external mode. However,
the only limits on a step hold time or on the number of steps to be executed are any
that may exist in the external device being used to program the Programmable Tem-
perature Controller.
3) All Programmable Temperature Controller front panel keys are disabled when the
unit is used in the external mode.
4) Every command sent to the Programmable Temperature Controller will be echoed
back as part of the controller’s response to the command received.
5) In the examples that follow do not enter the brackets ({}). CR indicates a carriage
return (on a keyboard the Return or Enter key will produce a carriage return), and
should be used after each command. When the Programmable Temperature Control-
ler sends a command to the computer, it will be terminated by a carriage return. A
carriage return may cause a line feed on some terminals.
6) All sensed and setpoint temperatures sent to or received from the Programmable Tem-