Sensor Control Parameters
Contents
1. EL CTROCH M CcRe nT ff G TOMORROW APPLICATION NOTE AN106 Sensor Control Parameters Introduction This application note describes use of the Sensor Control Parameter SCP command This command either writes to or reads values from the sensor In the SCP section of the user manual there is a table which lists and describes all of the SCP identifiers Several sensor control parameters will influence how the measurements are acquired and how the results are computed How to use the SCP Command Commands can be sent to the sensor using any terminal application Electrochem recommends using the X CTU software supplied on our Software Distribution CD which ships with our products The command must be entered into the terminal application in a very specific syntax This syntax is referred to as a Command Data Frame Structure The Send Packet dialogue in Figure 1 illustrates proper syntax To see the hexadecimal commands in the terminal window click on the Show HEX button Make the Send Packet dialogue X CTU COM3 Io x available by clicking on the PC Settings Range Test Terminal Moder Configuration Assemble Packet button Line Status Assert Close Assemblel Clear Hide Select the HEX radio button in CTS CD DSR DTR M RTS M Break Com Pot Packet Screen Hex the Display section before a eae 7E 00 06 01 52 00 65 00 28 IF 7E 00 entering commands Before 03 89 52 00 24 7E 00 07 81 00 65 2A entering an SCP command LR send a Se2. firms transmission and execution of the command and displays any resulting data The example shown in Figure 1 illustrates the procedure for changing a sensor s units of measure for temperature from Fahrenheit which is the default setting to Celsius Included in the terminal window are the following The first data frame is the Sensor Factory Unlock command Second the SCP Write data frame Byte 10 of this data frame 0x09 is the SCP ID for TemperatureUOM Byte 11 0x01 is the data which determines how to alter the sensor s parameter Third is the Sensor Save Enable SSE command which allows for the saving of data from RAM into flash memory This data frame is outlined in the SSE section of the user manual Fourth is the Sensor Memory Save SMS command which actually saves the data from RAM into flash memory This data frame is outlined in the SMS section of the user manual The last data frame is the SCP Read command This command assures that the information has been properly saved to the flash memory Conclusion An exact byte by byte description of the Command Data Frame Structure can be found in the SCP section of the user manual Entering different command data frames into the X CTU program is not the only way to alter the sensor s control parameters The Factory Setup Application also included on our Software Distribution CD will allow users to configure the control parameters Note that changes made to the parameters via X CTU w
3. ill be reflected when using the Factory Setup Application Copyright Electrochem Solutions Inc
4. nsor Factory Unlock Ke Pil Peil op a ft ro gt o Wo D r uD med m D Lid La m uD I Pa D Pa J ed m SFU command as outlined R e amp 52 00 24 7E 00 07 81 00 65 2C 00 26 ae R 00 C7 7E 00 06 01 52 00 65 00 27 20 b the SFU of the user manual e amp ZE 00 03 89 52 00 24 7E 00 O7 81 00 This enables the overwriting of R e 65 2c 00 27 00 C6 7E 00 07 01 52 00 i ie 65 00 20 09 1E 7E 00 03 89 52 00 24 data in the sensor s RAM _ e 7E 00 08 81 00 65 2C 00 20 00 01 cC The hexadecimal value 0xA0O R is the API ID located in byte9 jz sa a Silchar vs x actual SCP command to elias write information to the FE OO OF 01 52006500 2009 1E sensor Replace that with a 0x20 in order to read information from the sensor As illustrated in Figure 1 the commands entered have Byte count 11 Display F l HEX been echoed in the terminal Clase Bale Clear en COM 57600 O M 1 FLOW NONE Ax 91 bytes Figure 1 X CTU Terminal Window Copyright Electrochem Solutions Inc EL CTROCH M Ch EAT TOMORROW window shown in blue The information shown in red is the response data followed by the reply data The two frames can be distinguished by looking for the Start Delimiter indicated by 0x7E in byte 1 of each data frame The response data frame indicates success or failure of the data transmission to the sensor The reply data frame con
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