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1. or status messages all ending with a carriage return ASCII 13 Example 4 60 lt CR gt The baud rate is 38400 8 bits no parity with one stop bit The voltage swing 0 VCC not 12 volts If standard voltage level RS232 is desired connect an RS232 converter such as a MAX232 RS 232 receive pin pH probe connection For best results use an Atlas Scientific pH probe Atlas Scientific com Copyright O Atlas Scientific LLC All Rights Reserved 3 ae AtlasScientific Absolute Maximum Ratings Parameter Storage temperature H Circuit Storage temperature H probe Vee Note Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device Exposure to maximum rating conditions for extended periods may affect device reliability Device operation When the pH Circuit is connected to a power supply 2 5v to 5 5v the green power on indicator LED will be lit The device will immediately enter standby mode and wait for a command There are a total of 11 different commands that can be given to the pH Stamp All commands must be followed by a carriage return lt CR gt Commands are not case sensitive Command list Quick reference Command Function Default state L1 Enables debugging LEDs Enabled LO Disables debugging LEDs Disabled R Takes one pH reading N A C Takes continuous pH readings every 262 seconds N A with LEDs off Every 462 seconds with LEDs on E
2. inaccurate if it has been boiled The Wire length from the pH probe to the pH Circuit should be as short as possible to reduce noise 14 00 mm Do not use this type of connection 20 16 mm Atlas Scientific com Copyright Atlas Scientific LLC All Rights Reserved 10 ae AtlasScientific Known Issues During calibration rapidly switching the pH probe from a pH 4 to a pH 10 when the pH Circuit is in continues mode can cause a device reset This will NOT damage the pH Circuit Simply re send the c command and continue with calibration Touching the pH Circuit can cause false readings these readings can last as long as 5 minutes As the pH Circuit returns to normal operation the pH readings will progressively return to normal Uneven heating can cause the pH Circuit to return false readings Thermal stability should be considered when using this product Atlas Scientific com Copyright Atlas Scientific LLC All Rights Reserved Atlas Scientific com
3. wrk 6 A Sr E A vate y Ser a sere ty aera re Tria Tal chy 7 Pe E rt ce al lao A RM 7 o epee repay ree mo mney A 7 eee Ne reer etre N T E ete ay eevee Fanner rT rar hai 8 E EE eke enna E E a E Io A 8 Calibration instructions toi ios 9 A A O 11 Atlas Scientific com Copyright O Atlas Scientific LLC All Rights Reserved 2 ae AtlasScientific System Overview Standard pH circuitry can be bulky and complex often operating at voltages outside of the typical logic level realm Atlas Scientific has reinvented the way pH monitoring is done The pH Stamp is an embedded solution designed to output quick calibration free scientific grade pH readings in a simple RS 232 data transmission From a single as needed pH reading to an infinite number of readings the pH Circuit will deliver an accurate reading in just 262 milliseconds 462 milliseconds with LEDs on It is important to keep in mind that only temperature dependent readings can be considered scientific grade pH readings Without adding temperature information to your reading request the pH stamp will use a default temperature of 25 C See page 6 for more information Pin Out GND Vec TX RX BNC Return for the DC power supply GND amp Vcc must be ripple and noise free for best operation Operates on 2 5V 5 5V TX output delivers asynchronous serial data in RS232 format except voltages are 0 Vcc The output is up to twelve ASCII characters representing the pH
4. TT Take temperature dependent reading 25C Stops all readings Enter standby quiescent mode N A S Calibration at pH Seven N A F Calibration at pH fia N A T Calibration at pH iia N A X Return stamp to factory settings N A l Information Type of stamp firmware version e firmware creation date N A Atlas Scientific com Copyright O Atlas Scientific LLC All Rights Reserved 4 ae AtlasScientific Command Definitions L1 This will enable both debugging LED s The pH Circuit has two LED s Green LED ariii Power indicator Red L D ui Instruction received pH transmit By default the LED s are enabled These LED s are designed to help the user determine that the pH Circuit is operating properly Changes to this setting are written to EEPROM memory and therefore will be retained even if the power is cut Keeping the LEDs on will consume an additional 30 mA Full proper syntax l1 lt cr gt or L1 lt CR gt LO This will disable both debugging LED s Changes to this setting are written to EEPROM memory and therefore will be retained even if the power is cut Full proper syntax l0 lt cr gt or LO lt CR gt R Instructs the pH Circuit to return a single pH reading This instruction takes 262 milliseconds to complete 462 milliseconds with the LED s on Full proper syntax r lt cr gt or R lt CR gt The pH Circuit will respond XX XX lt CR gt If the pH Circuit detects that a Ph probe is not connected or damaged it will not
5. der 4 pH7 6 pH 10 1 First place you pH probe in the yellow pH7 calibration solution 2 Instruct the stamp to go into continues mode 3 Wait 1 to 2 minutes 4 TX the commana Your pH Circuit is now calibrated for pH7 5 Rinse off pH probe dry with paper towel 6 Place pH probe in the red eR calibration solution 7 Wait 1 to 2 minutes Circuit should still be in continues mode 8 TX thelBcommanad Your pH stamp is now calibrated for pH4 9 Rinse off pH probe dry with paper towel 10 Place pH probe in the blue calibration solution 11 Wait 1 to 2 minutes Circuit should still be in continues mode 12 TX thelll command Your pH Circuit is now calibrated for pH10 13 Transmit the E command 14 The pH Circuit is now calibrated The calibration data is stored in the EEPROM and will be retained even if the stamp is powered off Atlas Scientific com Copyright O Atlas Scientific LLC All Rights Reserved 9 ae AtlasScientific REMEMBER ALL TRANSMITION ARE TERMANATED WITH A lt CR gt THEY ARE NOT TERMANATED WITH A lt CR gt lt LF gt MAKE SURE YOUR CODE DOES NOT INADVERTENTLY SEND lt CR gt lt LF gt AT THE END OF A TRANSMITION OK lt CR gt NOT OK I lt CR gt lt LF gt A pH probe will typically last between three and four years A pH probe should be considered inaccurate if it has been frozen A pH probe should be considered inaccurate if it has been allowed to dry A pH probe should be considered
6. ed on again temperature will go back to its default of 25 C Full proper syntax 35 lt CR gt or 35 67 lt CR gt E This instructs the pH Circuit to end continuous mode and enter its standby quiescent mode Atlas Scientific com Delivering the E END instruction when not in continuous mode will have no effect on the pH Circuit Full proper syntax e lt CR gt or E lt CR gt The pH Stamp will respond by ceasing data transmission There is no ASCII response to this instruction Copyright O Atlas Scientific LLC All Rights Reserved 6 AtlasScientific X Instructs the pH Circuit to return to its original factory settings Transmitting this command will Reset calibration off set back to O Reset default temperature back to 25 C Set debugging LED to on Full proper syntax x lt cr gt or X lt CR gt The pH Circuit will respond reset lt CR gt l Instructs the pH Circuit to transmit it version number A comma separated string will be transmitted that will contain 3 values 1 The type of device Pp for pH 2 The firmware version number V3 0 3 The firmware version date 8 11 August 2011 Full proper syntax i lt cr gt or I lt CR gt The pH Circuit will respond P V3 0 8 11 lt CR gt S This instructs the pH Circuit to calibrate itself to a pH7 solution Full proper syntax s lt CR gt or S lt CR gt The pH Circuit will respond with a calibrated pH reading 7 00 lt CR gt Sending the S comma
7. go AtlasScientific pH Circuit Hardware V3 0 Firmware V3 4 Micro footprint pH monitoring subsystem Features e Full range pH reading from 01 to 14 00 e Accuracy within two significant figures XX XX e Single reading or continuous reading modes e Temperature dependent or independent readings e Simple calibration protocol e Simple RS 232 connectivity voltage swing 0 VCC e Simple instruction set consisting of only 11 commands e Micro footprint circuitry e Debugging LED s e 2 5V to 5 5V operational voltage e Low power consumption 1 6 mA at 3 3V in active mode 0 7 mA at 3 3V in quiescent mode LED s off Description The pH Circuit is a highly compact pH monitoring system that fits into any breadboard This design configuration allows the user to accurately monitor pH without having to add any additional circuitry or components to your design Communication with the pH Circuit is done using only 11 simple commands The pH Circuit provides scientific grade readings to any embedded system that has an RS232 connection interface voltage swing O VCC not 12 volts Atlas Scientific com Copyright O Atlas Scientific LLC All Rights Reserved 1 ae AtlasScientific Contents A A E 3 Absolute Maximum Ratings ooooccooccoccnooccnoccnccnnaccnoccnocono 4 Device A A a e setae 4 E E A E E E O P OA 5 E T PS Pa 5 A A A rotores pe ero IA 5 o ively o le OA 6 A aer O 6 O E EE Mini ome A Aas Soran yaoet wise inne ty
8. nd when the pH probe is not immersed a pH 7 will calibrate the pH stamp to see that whatever it was reading to now be a pH 7 and could lead to significant errors Do not do this Atlas Scientific com Copyright Atlas Scientific LLC All Rights Reserved 7 ae AtlasScientific F This instructs the pH Circuit to calibrate itself to a pH4 solution Full proper syntax f lt CR gt or F lt CR gt The pH Stamp will respond with a calibrated pH reading 4 00 lt CR gt Sending the S command when the pH probe is not immersed a pH 4 will calibrate the pH Circuit to see that whatever it was reading to now be a pH 4 and could lead to significant errors Do not do this T This instructs the pH Circuit to calibrate itself to a pH10 solution Atlas Scientific com Full proper syntax t lt CR gt or T lt CR gt The pH Circuit will respond with a calibrated pH reading 10 00 lt CR gt Sending the S command when the pH probe is not immersed a pH 10 will calibrate the pH Circuit to see that whatever it was reading to now be a pH 10 and could lead to significant errors Do not do this Copyright Atlas Scientific LLC All Rights Reserved 8 ae AtlasScientific Calibration Instructions In order to provide the engineer with the greatest possible accuracy pH stamps now ship uncalibrated This is because micro voltage changes in your circuit design cannot be compensated for at the factory The pH Circuit must be calibrated in the following or
9. transmit a pH reading Instead it will resoond with the error message check probe check probe lt CR gt Atlas Scientific com Copyright Atlas Scientific LLC All Rights Reserved 5 ae AtlasScientific C The pH Stamp will operate in continuous mode and deliver a pH reading every 262 milliseconds 262 milliseconds with the LEDs off until the e command is transmitted tt tt where t is Full proper syntax C lt CR gt The pH Circuit will respond LED S ON XX XX lt CR gt 262 milliseconds XX XX lt CR gt 524 milliseconds XX XX lt CR gt 786 milliseconds XX XX lt CR gt n 264 Seconds LED s on the pH Stamp off will respond every 462 milliseconds If pH Circuit detects that a Ph probe is not connected or damaged it will not transmit a pH reading Instead it will respond with the error message check probe check probe lt CR gt temperature in C By transmitting a temperature to the pH Circuit a temperature compensated pH reading will be returned in the same manner as is seen when using the R command However the temperature entered will now be the new default temperature Therefore it is not necessary to transmit a temperature each time a reading is taken A temperature can be transmitted one time and then a C command can be issue This will return continuous pH readings at the new temperature Temperature data will be lost if Circuit is powered off When the pH Circuit is power

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