Manual

Brookfield Engineering Labs., Inc. Page 18 Manual No. M/98-206-A0402

perature Controller are formatted as a four digit integer number. Setpoint tempera-

tures being sent should first be multiplied by a factor of ten and expanded to four

digits with leading zeros if necessary. All temperatures (sensed or setpoint) being

read from the Programmable Temperature Controller should be divided by a factor of

ten to obtain the actual temperature.

The operator/user can develop a variety of programs for controlling the Programmable Temperature

Controller via the RS-232C protocol to meet specific needs of the laboratory. The following commu-

nication protocol can be used in any desired combination:

1) To read the current temperature, enter T {CR} at the external device.

The response from the Programmable Temperature Controller to the external device will be:

T{tttt}{u}{s

}{CR}

where:

tttt indicates the current temperature multiplied by a factor of ten;

u indicates the temperature scale (°F or °C);

indicates the present state of the Programmable Temperature

Controller (as described in Table 8 at the end of this section).

A typical response might be T2345F1, which means that the temperature is 234.5°F, and the con-

troller is presently in the run mode (1).

2) To read the current temperature setpoint, enter S{CR} at the external device. The response from

the Programmable Temperature Controller to the computer will be:

S{s

}{u}{s

}{CR}

where:

indicates the current setpoint multiplied by a factor of ten;

u indicates the temperature scale (°F or °C);

indicates the present state of the controller.

A typical response might be S1004C2, which means that the current setpoint is 100.4 °C, and the

controller is in the wait or standby mode (i.e. the Programmable Temperature Controller is not

controlling the Thermo Container).

3) To adjust the temperature setpoint, enter RS{s

}{u}{CR} at the external device where

is the setpoint temperature multiplied by ten and u indicates the temperature scale in

either °F or °C.

A typical command sent to the controller might be RS1004C{CR}, which indicates the new setpoint

should be 100.4 °C. The generic form of the response from the Programmable Temperature

Controller to the computer will be in the form:

RS{s

}{u}{s

}{CR}