SRO100 User Manual
Contents
1. Default value 0000 Press ENTER to see current code value Use UP and DOWN buttons to change digits if desired ESC progresses to next digit Press ENTER to accept value Note DO NOT FORGET YOUR CODE or you will be unable to access the menu system Address Selection Each SRO100 can be assigned its own unique address from 0 to 31 This is especially useful if networking multiple units together under RS 485 serial communications Default address 00 Press ENTER to see current address Use UP and DOWN buttons to select desired address Press ENTER to accept address value Note To avoid communication conflicts no two modules in a networked system may share same addresses Baud Rate Select an appropriate Baud bits per second rate for serial communications Default value 9600 Press ENTER to enter Baud Rate submenu Use UP and DOWN buttons to select baud rate from available values 1200 2400 9600 19200 Press ENTER to accept baud rate value Communication Select an appropriate type of serial communication Default value RS 232 Press Enter to enter Communication submenu Use UP and DOWN buttons to select required form of communication Press ENTER to accept choice Load Configuration Setup File Set up the SRO100 by loading a configuration file from memory Press ENTER to enter File Loading submenu Use UP and DOWN buttons to select from files 0 3 or the default file Press ENTER to accept choice Save Co2. GMH Engineering SRO100 UL Co Co CJ GMH Engineering USERS MANUAL SRO100 Programmable Digital Indicator And Frequency Counter SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Introduction The SRO100 Programmable Digital Indicator Frequency Counter may be used in any application requiring a programmable frequency counter with a scaled output The SRO100 also includes a configurable power supply and measurement interface for use with other GMH Engineering products including the Delta DRS1000 Non Contact Speed Sensor and the HFW80 Fifth Wheel The SRO100 has an easy to read backlit LCD display with six large digits Besides displaying the measured value the unit can record Max Min readings and register Hi Lo alarms with an audible beeper The easy access front keyboard provides straightforward menu navigation Multiple configurations may be saved in non volatile memory with password protection The SRO100 can communicate with other intelligent systems via its built in RS 232 and RS 485 serial communication ports enabling an external device to receive measurements and to control multiple SRO100 units Setup The SRO100 may be configured either by using the Menu Functions which are accessed using the front panel display and keypad buttons or by Serial Communication with another intelligent device Settings may be saved in one of four non volatile memory files to avoid losing them
3. Figure One and to the keypad button functions shown in Table Two LCD Backlighting The SRO100 display has backlighting to illuminate the LCD display under low light conditions Default state ON Press ENTER to toggle backlighting ON OFF when saved this determines the power up condition Note in Normal Mode ESC toggles the backlighting ON OFF Leading Zeros Allows blanking of leading zeros of display reading when not required i e 215 instead of 000215 Default state ON all leading zeros visible Press ENTER to toggle leading zeros ON OFF Decimal Point Selection Allows placement of the decimal point in the display reading Default state No decimal point Press ENTER to go to the Decimal Point submenu UP and DOWN buttons scroll through available options No DP DPI DP5 Press ENTER to select the required decimal point Calibration The display reading can be scaled to the appropriate value for the input frequency count When using the front panel the scale factor is achieved via a linear two point calibration method where one point is fixed at OHz input zero on the display the second point is set by presenting a known frequency at the SRO100 input terminals and entering the desired reading at that frequency Default value Factory Default Value Press ENTER to go to the Calibration submenu UP and DOWN buttons scroll between DEFault or CUStom calibration Press ENTER again to select choice If
4. F Decimal Point Place x places 1 through 5 DISPLAY Backlighting ON 1 OFF 0 Beeper ON 1 OFF 0 Set Annunciator Engineering Units Load Default Setup Load Setup File x Save Setup File x GENERAL Hello Any units attached 1 Read Module Serial Number Serial Number Read Device Info Device Info Notes aa device address 0 31 x digit value or decimal point i e 1 9 or c uppercase character or a space i e M Response is ASCII character 1 if command successful 0 if incorrect or unsuccessful Rev 0 0 Copyright 2001 GMH Engineering 9 of 12 SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Wiring The wiring connections for the SRO100 are located inside the protective enclosure which may be opened by removing the four hex head screws on the back of the unit Inside is a printed circuit board with two screw terminal blocks as shown in Figure Four Terminal Block One is for connecting the input to the SRO100 and also contains two terminals for the External Sensor Power Port see next section It has color code labels for easy connection to certain other GMH Engineering Products such as the DRS1000 Non Contact Speed Sensor Terminal Block Two is for SRO100 supply power and RS485 serial communications RS 232 serial communications are accessed through the DB 9 connection on the outside of the enclosure Pin connections for both terminal blocks are given in Tables Four and Five The SRO100 input
5. These settings may then be retrieved as desired to quickly configure the SRO100 The unit will remember current settings for as long as it receives a correct supply voltage When the power is cycled all unsaved settings are lost and the SRO100 powers up to the last saved settings If none were saved default settings will be used Depending upon arrangements made when the device was ordered the SRO100 may be supplied with sample settings saved in one or more of the non volatile memory files These settings may be for use with other GMH Engineering products such as the Delta DRS1000 Non Contact Speed Sensor or the HFW80 Fifth Wheel and include features such as scale factors and custom display annunciators engineering units Refer to literature included with the unit for more information How to contact GMH Engineering GMH Engineering 336 S Mountain Way Orem UT 84058 801 225 8970 FAX 801 225 9008 Internet www gmheng com Email info gmheng com Rev 0 0 Copyright O 2001 GMH Engineering I of 12 SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Front Panel Operation The front panel consists of a display keypad and on off switch The functions of the display indicators and keypad buttons are shown in Tables One and Two There are two modes of operation Normal Mode and Menu Mode Pressing the ENTER button while in Normal Mode changes to Menu Mode which is used for setting up the unit Table 1 Di
6. Under RS 232 communications only a single unit should be connected to a personal computer or other device as shown in Figure Three Figure 2 RS 485 Network Master Device B pb by SRO100 RS 485 Termination LK2 Option Enabled 25 PIN DB 25 CONNECTOR q SRO100 9 PIN DB 9 CONNECTOR A personal computer can interface with the SRO100 through one of the computer s serial ports by means of aterminal program Examples of terminal programs include Hyperterminal included with the Microsoft Windows operating systems or Kermit which can be obtained for many different operating systems The receive data RX and transmit data TX lines must be interchanged between the SRO100 and the computer as shown in Figure Three null modem cable and the terminal program must be set to transmit a CR LF carriage return or line end and line feed rather than a simple CR for the computer s ENTER key Rev 0 0 Copyright O 2001 GMH Engineering 7of 12 SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Serial commands are shown in Table Three All commands are ASCII characters and are case sensitive Each command consists of a two digit address aa corresponding to the unit s address followed by the command and then the ASCII CR LF characters ENTER key In Table Three x corresponds to a digit value or a decimal point representing the desired value and c corresponds to an uppercase character or a
7. erify communication by sending 03R responses isa 1 Setup annunciator to read KPH by sending 03EKPH response is a 1 Enter m value by sending 03D0 00761 response is a 1 Enter c value by sending 03CO0 response is a 1 Verify calibration by sending 03X response is Device Info including m and c values Save to file number 0 by sending 03USO response is a 1 SRO100 will now display 10KPH at 1314 Hz input 20 at 2628 Hz input etc Note The apparent precision of the displayed value is influenced by the position of the decimal point 8 of 12 Rev 0 0 Copyright 2001 GMH Engineering SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Table 3 Serial Commands Description Address Command Response ALARMS Alarms ON 1 OFF 0 Ax Set Low AlarmValue ALxxxxxx Set High Alarm Value AHxxxxxx Set Hysteresis Value AYxxxxxx COMMUNICATIONS Baud Rate 1200BPS Baud Rate 2400BPS Baud Rate 9600BPS Baud Rate 19200BPS Response will be at new baud rate Set Address Select RS 232 Communications Select RS 485 Communications Response will be in newly selected mode Current LCD Reading LCD Value Read MAX Value MAX Value Read MIN Value MIN Value Reset MAX MIN Values 1 CALIBRATION Set Slope m Value y mx c Dxxxxxxxx Set Intercept c Value y mx c Cxxxxxxxx INPUT AVERAGING Update every 1 Sample Update every 2 Samples Update every 4 Samples Update every 8 Samples FORMAT Leading Zeros ON 1 OFF 0 Decimal Point OF
8. is normally a single ended signal 0 12V but the SRO100 is also compatible with a differential input signal 0 5V nominal An optional full differential input may be factory installed contact GMH Engineering for details For a single ended input use pin 3 only of Terminal Block One and leave pin 4 unconnected the signal on pin 3 is then referenced to the External Sensor Ground on pin 1 of Terminal Block One For a differential signal connect as shown in Table Four Table 4 Input Connections INPUT Screw Terminal Block 1 BLACK External Sensor Ground 2 RED External Sensor Power WHITE Signal Input Table 5 Output Connections Power RS485 Serial Communications Screw Terminal Block 2 GROUND Supply Ground Power RS485A RS485 A Serial Communications RS485B RS485 B Serial Communication TO AVOID INJURY AND OR DAMAGE TO THE SRO100 PLEASE MAKE SURE SUPPLY POWER IS TURNED OFF AT THE SOURCE WHENEVER THE SRO100 ENCLOSURE IS OPEN 10 of 12 Rev 0 0 Copyright 2001 GMH Engineering SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Figure 4 Circuit Board and Wiring Connections Cut Fuse Option 1 Terminal Block 1 Cut Fuse Terminal LK2 OPTION Block 2 AY amp I WAR dt onnowys HS8PSH WSSrSHY N lLdO CT Oo Install Jumper Option 1 Optional Configurations The SRO100 can be user configured with two avai
9. lable options by making minor changes to the printed circuit board inside the enclosure see Figure Four In order to do this it may be necessary to solder a jumper wire between two points or to break one of the circuit connections by using a razor blade or similar implement to cut across a fuse trace on the printed circuit board When cutting a fuse trace the depth of the cut should only extend through the copper layer on the top side of the printed circuit board and need only be wide enough to break the electrical connection between the two points Proper connections may be verified using the continuity checking feature of a voltmeter Following is a description of the available options and the required modifications all options refer to changes which affect characteristics of connections on Terminal Block One Default Configuration No Modifications The same supply voltage presented to the SRO100 is available at the External Sensor Power Port Pins 1 and 2 Option 1 Cut Fuse and install Jumper to cause the voltage at the External Sensor Power Port Pins 1 and 2 to be 5Vdc regulated Note the maximum current available to the external sensor is 100mA with this option enabled LK2 Option Cut Fuse to disable terminating resistor for RS 485 Serial Communications This would normally only be done to network multiple SRO100 units together In any case the resistor should remain in place on the last SRO100 unit in an RS 485 bus See Figure Tw
10. larm 10000 Low Alarm 200 High Alarm switches on at 10000 and off at 9900 Low Alarm switches on at 200 and off at 300 Default state No alarm levels set hysteresis is zero Press ENTER to go to the Alarms submenu UP and DOWN buttons scroll through the available options AL ON OFF Press ENTER to toggle the alarms ON OFF HI AL Seta value for the High Alarm value between 0 and 999999 default is 100000 Press ENTER to see any previously set value then use UP and DOWN to change polarity or digits to required value ESC progresses to next digit Press ENTER to accept value LO AL Set a value for the Low Alarm value between 0 and 999999 default is 010000 Press ENTER to see any previously set value then use UP and DOWN to change polarity or digits to required value ESC progresses to next digit Press ENTER to accept value HYST Seta value for the Hysteresis value between 0 and 999999 default is 000000 Press ENTER to see any previously set value then use UP and DOWN to change polarity or digits to required value ESC progresses to next digit Press ENTER to accept value Note There are no criteria for the setting of alarm levels Values may be equal or inverted hysteresis levels may overlap Changes to settings take effect when exiting Menu Mode Alarms are evaluated after every display update depending upon Filter settings below Filter Selection The SRO100 can be configured with a smoothing filter to average dis
11. nfiguration Setup File SRO100 configuration values may be stored in one of four setup files allowing the unit to be easily set up by loading a configuration file from memory above even when the unit power has been cycled Press ENTER to enter File Saving submenu Use UP and DOWN buttons to select from files 0 3 Press ENTER to accept choice and save configuration information to file Rev 0 0 Copyright O 2001 GMH Engineering 5 of 12 SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Figure 1 Menu Map Menu Map ENTRY CODE BACKLIGHTING LEADING ZEROS DECIMAL POINTS CALIBRATION DEFAULT CUSTOM ON OFF HI ALARM SET LO ALARM SET HYST FILTER MAX MIN RESET ANNUNCIATOR Choice BUZZER ON OFF SET PASSWORD CODE ADDRESS BAUD RATE COMMS TYPE 6 of 12 Rev 0 0 Copyright 2001 GMH Engineering SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Serial Communications The SRO100 can communicate with other intelligent devices by means of RS 232 and RS 485 serial communication This provides a convenient way to set up the device and also to interface to an existing system In addition features such as custom annunciators engineering units and a null offset calibration value are only configurable in this way Under RS 485 communications multiple units may be networked together as shown in Figure Two and are distinguished by the unique address assigned to each device
12. o Rev 0 0 Copyright O 2001 GMH Engineering l1lof12 SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Specifications and Physical Dimensions Input Pulse 0 12 V single ended Display Options Lead zero blanking decimal pt 0 5V nominal differential engineering units beep on off backlighting on off 2V nominal switching threshold Supply Voltage 6 0 16 0 Vdc match sensor if using Frequency Measurement External Sensor Power Port without Option 1 Range 1 999999 Hz Resolution 1 Hz Supply Current 30 mA 50 mA w backlighting Accuracy 20 ppm overall error not including external sensor requirements Transition Rise Fall Time 30 ms max Update Rate 1 Sample sec External Sensor Power Port Smoothing 1 2 4 8 Sample averaging SRO100 Supply voltage 1A max or optional 5Vdc regulated 100mA max Scale Factor Calibration 2 pt linear Temperature Range 32 F to 120 F 0 C to 50 C Serial Communication Baud Rates 1200 2400 9600 19200 Weight 0 5 Ib 227 kg Protocols RS 232 and RS 485 32 unique user selectable addresses Figure 5 Physical Dimensions 19 48 24 61 II 3 IIT 46 22 UNC K 1245 d THRU 4 E PLACES 44 112 DB 9 T CONNECTOR ment B Fr 5 4 25 22 ET NOT TO SCALE DIMENSIONS IN INCHES MIMI Information furnished by GMH Engineering is believed to be accurate amp reliable No responsibility is assumed however by GMH Engineering for it
13. play readings Select the number of readings to average from to 8 before updating display Default value 1 Press ENTER to enter Filter submenu UP and DOWN buttons scroll through available options 1 2 4 8 sample averaging Press ENTER to select desired value ESC to cancel Max Min Readings The SRO100 can memorize the highest MAX and lowest MIN readings encountered since power up Press ENTER to reset the MAX and MIN values Annunciator Selection Engineering units corresponding to measured input values can be displayed on the SRO100 This Menu Function may be used to select the desired annunciator Default value None Press ENTER to enter Annunciator submenu UP and DOWN buttons scroll through available options Current Hz kHz MHz x10 000 QTY deg kWh m s 1 m l s None Press ENTER to select desired value Note Custom annunciators may be programmed by means of serial communication and saved in a configuration file See section on Serial Communications 4of 12 Rev 0 0 Copyright O 2001 GMH Engineering SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Audible Feedback Beeper If enabled a beeper emits a tone when a keypad button is pressed or when an alarm level is reached Default state OFF Press ENTER to toggle the beeper ON OFF Password Protection CODE Password protection by means of a four digit code allows the unit configuration to be protected if required
14. s use whether correct or incorrect nor can GMH Engineering be held liable for consequences or any infringements of patents or other rights of third parties which may result from its use Information in this document is current as of date of writing and is subject to change 12 of 12 Rev 0 0 Copyright 2001 GMH Engineering GMH Engineering 336 S Mountain Way Orem UT 84058 USA 801 225 8970 FAX 801 225 9008 WWW GMHENG COM
15. space Here are some example commands all commands followed by a CR LF 00J2 set the decimal point at place two on unit with address 0 23V get current LCD reading on unit with address 23 O1EMPH set annunciator to display MPH on unit with address 1 31G0 turn off backlighting on unit with address 31 14UL3 load setup file 3 on unit with address 14 11X get device info on unit with address 11 R any device out there If the address of the unit is unknown then use the characters to cause any connected unit to reply to avoid confusion only one unit should be connected under RS 485 when using this command Baud rate should match SRO100 configuration Both RS 232 and RS 485 require 8 Data Bits No Parity and 1 Stop Bit No flow control is used Device Info returned using the aaX command is formatted as follows FIRMWARE VERSION ALARM ON OFF HIGH ALARM VALUE LOW ALARM VALUE HYST VALUE CALIBRATION m VALUE CALIBRATION c VALUE AVERAGING 1 1 Sample 2 2 Samples 3 4 Samples 4 8 Samples LEADING ZEROS ON OFF DP SELECTION ANNUNCIATORS BACKLIGHT ON OFF BEEPER ON OFF Here is an example showing how to enter and save a calibration and custom engineering units through serial communication for a given application Desired Scale Factor 131 4 Hz KPH with no offset SRO100 Address 3 Linear equation will be in form y mx c where m 1 131 4 0 007610 c 0 0 all commands followed by a CR LF Connect to SRO100 and v
16. splay Indicator Functions Display Indicator Normal Mode Menu Mode 6 Large Digits Displays measured input value 3 Small Digits Engineering units of input value level are available by pressing UP button level are available by pressing DOWN button Table 2 Keypad Functions Normal Mode Menu Mode Toggles display backlighting on off Escapes the operator to the previous menu and exits from MAX and MIN readings level or progresses to the next digit when entering values Displays the highest encountered input If Up Arrow displayed scrolls upward value since power up MAX reading through available menu options Displays the lowest encountered input If Down Arrow displayed scrolls value since power up MIN reading downward through available menu options Enters Menu Mode at password level Toggles between available menu options or selects current option 2 of 12 Rev 0 0 Copyright 2001 GMH Engineering SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Menu Functions Menu functions used for configuring the SRO100 are accessed by pressing the ENTER button while in Normal Mode Upon doing so the operator will be prompted to enter the CODE or 4 digit password The default password is 0000 Pressing ENTER again after entering the password will continue to the next menu function The following is a brief description of each of the menu functions and available menu options Refer to the Menu Map shown in
17. using custom calibration then use UP and DOWN to change digits to required value ESC progresses to next digit Press ENTER to accept calibration value Press ENTER again to confirm acceptance Press ESC to cancel the calibration operation For example Desired Scale Factor 10 Hz Unit where Unit is displayed on annunciator Present known input frequency 1000Hz at input terminals While input frequency is active enter calibration menu and choose CUStom calibration Change display to read 100 and ENTER SRO100 displays W AIT and stores value ENTER again to confirm Exit Menu Mode by pressing ESC SRO100 will now display 1 at 10Hz input 23 at 230Hz input etc Note that this method differs from setting the calibration by means of serial communication and does not allow for a null offset or non zero reading at OHz See section on Serial Communications Rev 0 0 Copyright O 2001 GMH Engineering 3 of 12 SRO100 Programmable Digital Indicator And Frequency Counter Users Manual Alarm Levels and Hysteresis Preset two alarm levels or trip points with hysteresis When an alarm is tripped the UP or DOWN arrow will be displayed on the LCD and the beeper will sound if enabled The hysteresis value is the difference in reading between an alarm switching on and switching off Set levels of any unused alarms to a value that can never be reached in practice for example 999999 for High Alarm or 1 for Low Alarm For example Hysteresis 100 High A
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