49
12.
OUTPUT ON/OFF
Write Command: 2d
Read Command: 46
Interpret:
0 is off.
1 is on.
13.
OUTPUT SHUTDOWN IF ALARM
Write Command: 2e
Read Command: 47
Interpret:
0 is no shutdown upon alarm.
1 is to shutdown main output drive upon alarm.
14.
FIXED DESIRED CONTROL SETTING
Write Command: 1c
Read Command: 50
Interpret:
When writing, multiply the desired control temperature by 100
10
and convert
to hexadecimal. This becomes the “send value.”
When reading, convert the “return value” to decimal and divide by 100 to
convert to °F/°C.
When CONTROL TYPE is set to “computer control”, the output power sent to
the cooler can be set anywhere from -511
10
to +511
10
, corresponding to -
100% to +100% output power. Remember to convert to hexadecimal before
sending.
15.
PROPORTIONAL BANDWIDTH
Write Command: 1d
Read Command: 51
Interpret:
Fixed-point temperature bandwidth distributed around the control setting in
ºF/ºC. A value of 5 ºF/ºC for bandwidth and control setting of 25 ºF/ºC would
place the proportional band from 20 ºF/ºC to 30 ºF/ºC; that is, 5 ° above and 5
° below set point.
When writing, first multiply the desired bandwidth setting by 100
10
and
convert to hexadecimal for the “send value.” When reading, convert the
“return value” to decimal and divide by 100
10
to covert to °F/°C.
NOTE: when using the GUI software supplied by TE Technology, the
proportional bandwidth is treated in a more conventional manner in which
the bandwidth is centered about the set-point temperature. The GUI divides
the bandwidth by 2 before actually writing the value to RAM/EEPROM. So,
entering 5 ° through the GUI, would actually be saved as 2.5 (with
appropriate conversion to hexadecimal).
16.
INTEGRAL GAIN
Write Command: 1e
Read Command: 52
Interpret:
Fixed-point gain in repeats/min.
Multiply desired integral gain by 100
10
and convert to hexadecimal for the
“send value.” When reading, convert the “return value” to decimal and divide
by 100
10
to interpret.
