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V e r s i o n 2.1
4500.BAS
PROGRAM
USER’S MANUAL
DMD-480-S2 Series
AC POWERED BRIDGESENSOR
RS232 INTERFACE
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DMD-480-S2 SERIES AC POWERED BRIDGESENSOR - RS232 INTERFACE DMD-480-S2 Series SPECIFICATIONS Input DMD-482-S2 DMD-483-S2 DMD-485-S2 VV oltage, Full Scale ±V 25 m±V 30 m +50 m Rm esistance, Differential > 100 megoh CA urrent 100 p Cs ommon Mode Voltage 0 to +5 Volt Analog to Digital Conversion Ratiometric w/r Bridge Excitation Single Channel Input R0 esolution 1 part in 41,00 Cd onversion Rate 5 times / secon Le inearity - Referred to Input ±0.01% of Full Scal Temperature Coefficient (0° to
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DMD-480-S2 SERIES AC POWERED BRIDGESENSOR - RS232 INTERFACE DMD-480-S2 Series USER’S MANUAL PREOPERATION A. DMD-480-S2 SERIES HOOK-UP FIGURE 1 (REFER TO FIGURE 1 AND TABLE 1 FOR SCREW TERMINAL DESIGNATION) 1. CONNECT AC TO SCREW TERMINALS 5 AND 6 OF THE DMD-480-S2 SERIES TERMINAL BLOCK. 2. USING A ONE TO ONE DB9 CABLE, CONNECT ONE END TO YOUR COMPUTERS SERIAL PORT, (COM1 OR COM2 ONLY), AND THE OTHER END TO THE DMD-480-S2 SERIES FEMALE DB9 CONNECTOR. THE RECOMMENDED MAXIMUM CABLE LENGTH IS
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DMD-480-S2 SERIES AC POWERED BRIDGESENSOR - RS232 INTERFACE TABLE 3: ADDRESS EXAMPLES B. DMD-480-S2 SERIES DIP SWITCH SETTINGS 1. SET THE DESIRED ADDRESS FOR EACH UNIT BY SETTING SWITCHES 1-6. BY SETTING THIS ADDRESS, THE UNIT IS GIVEN ITS OWN IDENTITY TO WHICH THE HOST COMPUTER WILL IDENTIFY WITH. ADDRESS 63 • THE ADDRESS RANGE IS FROM 0 - 63 (DECIMAL) OR 111111 (BINARY). (REFER TO EXAMPLES IN TABLE 3). • SWITCH “ON” = 0; SWITCH “OFF” = 1 2. SET THE DESIRED MODE OF OPERATION FOR THE
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DMD-480-S2 SERIES AC POWERED BRIDGESENSOR - RS232 INTERFACE THE SETUP MENU ALLOWS THE USER TO SETUP THE CORRECT OPERATING PARAMETERS FOR THE DMD-480-S2 SERIES. 1. OPTION 0 [RETURN TO OPERATION MENU]: SELECTING THIS OPTION WILL RETURN YOU TO THE OPERATION MENU. 2. OPTION 1 [SELECT COMMUNICATIONS PORT]: THIS OPTION ALLOWS THE SELECTION OF EITHER COM1 OR COM2 AS THE COMMUNICATIONS PORT FOR THE DMD-480-S2 SERIES AND THE USERS COMPUTER. COM3 AND COM4 ARE NOT ALLOWED. THE SETTING OF THE COMMUNIC
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DMD-480-S2 SERIES AC POWERED BRIDGESENSOR - RS232 INTERFACE 6. OPTION 5 [SELECT UNITS TO MONITOR]: THE LAST OPTION SELECTS THE ADDRESS OF THE MODULES TO BE MONITORED IN THE ORDER IN WHICH THEY ARE TO BE MONITORED. ADDRESSES FROM 0 TO 63 MAY BE SELECTED. THE DEFAULT ADDRESS IS “1”. E. OPERATION MENU THE “OPERATION MENU”, ALLOWS 4 USER CHOICES. 1. OPTION 0 [QUIT]: ALLOWS THE USER TO QUIT THE PROGRAM. 2. OPTION 1 [SETUP THE UNITS]: EXECUTES THE “SETUP MENU”, WHICH ALLOWS THE USER TO SET ADDRE
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DMD-480-S2 SERIES AC POWERED BRIDGESENSOR - RS232 INTERFACE 1. APPLY 3 mV TO THE INPUT AND READ THE 10% DIGITAL COUNTS AS THE OUTPUT (K1). 2. APPLY 30 mV TO THE INPUT AND READ THE FULL SCALE DIGITAL COUNTS AS THE OUTPUT (K2) 3. WRITE TWO EQUATIONS: A) (K2 x A) + C = 0.030 VOLTS B) (K1 x A) + C = 0.003 VOLTS SUBTRACTING EQUATION B FROM A: (K2 - K1) x A = 0.027 VOLTS THEREFORE A = 0.027 VOLTS ‚‚‚‚‚ (K2 - K1) SOLVING FOR C , C = -K1 x A EXAMPLE 1: WITH 3 mV APPLIED THE DMD-483-S2 OUTPUT READS
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DMD-480-S2 SERIES AC POWERED BRIDGESENSOR - RS232 INTERFACE SOLVING EQUATION A - EQUATION B A = (100 ‚ 40,245) = .00248478 SOLVING FOR C, C = -1,500 x .00248478, C = -3.727 VERIFY YOUR RESULTS BY PLACING YOUR SOLUTIONS BACK INTO EQUATIONS A AND B: A) (41,745 x 0.00248478) + (-3.727) = 100.000 LBS B) (1,500 x 0.00248478) + (-3.727) = 0.000 LBS ONE COUNT = .00248 POUNDS G. WRITING DATA TO A FILE UNDER OPTION 3 OF THE SETUP MENU, THE COLLECTED DATA MAY BE WRITTEN TO A FILE SELECTED BY THE
