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AX2500/2850 Motor Controller User’s Manual 95
RS232 Commands Set
Query Heatsink Temperatures
Description:
This query will cause the controller to return values based on the temperature measured
by internal thermistors located at each heatsink side of the controller. Because NTC ther-
mistors are non-linear devices, the conversion or the read value into a temperature value
requires interpolation and a look up table. Figure 35 on page 63 shows this correlation.
Sample conversion software code is available from Roboteq upon request. The values are
unsigned Hexadecimal numbers ranging from 0 to 255. The lowest read value represents
the highest temperature.
Syntax: ?m or ?M
Reply: nn
mm
Where: nn = thermistor 1 read value
mm = thermistor 2 read value
Notes:
The hexadecimal format is intended to be deciphered by a microcontroller. When exercis-
ing the controller manually, you may use the Decimal to Hexadecimal conversion table on
page 103.
Query Battery Voltages
Description:
This query will cause the controller to return values based on two internally measured volt-
ages: the first is the Main Battery voltage present at the thick red and black wires. The sec-
ond is the internal 12V supply needed for the controller’s microcomputer and MOSFET
drivers. The values are unsigned Hexadecimal numbers ranging from 0 to 255. To convert
these numbers into a voltage figure, use the formulas described in “Internal Voltage Moni-
toring Sensors” on page 62.
Syntax: ?e or ?E
Reply: nn
mm
Where: nn = main battery voltage value
mm = internal 12V voltage value
Notes:
The hexadecimal format is intended to be deciphered by a microcontroller. When exercis-
ing the controller manually, you may use the Decimal to Hexadecimal conversion table on
page 103.
Query Digital Inputs
Description:
This query will cause the controller to return the state of the controller’s two accessory
inputs (inputs E and F) and the state of the Emergency Stop/Inverted input. See “Connect-
ing Sensors and Actuators to Input/Outputs” on page 49 for information on how to wire
and use these signals. The returned values are three sets of two digits with the values 00
(to indicate a 0 or Off state), or 01 (to indicate a 1 or On state).
Syntax: ?i or ?I