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Omega DRA-DCC-8 - page 1
DRA-DCC-8 DIGIT AL TO 8 CURRENT LOOP CONVERTER User’s Guide http://www .omega.com e-mail: info@omega.com ...
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Omega DRA-DCC-8 - page 2
USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGASM Customer Service: 1-800-622-2378 / 1-800-622-BESTSM Engineering Service: 1-800-872-9436 / 1-800-USA-WHENS M TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA Mexico and Latin America: T el: (95) 800-TC-OMEGASM F AX: (95) 203-359-7807 En Espanol: (95) 203 359-7803 e-mail: espanol@omega.com ...
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Omega DRA-DCC-8 - page 3
C o n t e n t s 1. MOUNTING INSTRUCTIONS 2. REPLACING FUSES 3. ASSEMBL Y 4. SUPPL Y VOL T AGE 5. MODES OF OPERA TION 5.1 0-20 or 4-20mA output current selection 5.2 Switch Settings 6. P ARALLEL CONTROL MODE 6.1 PLC Inter face 6.2 The "E" (ENABLE) T erminal 7. SERIAL CONTROL MODE 7.1 RS232c / RS422 Select 7.2 RS422 T ermination 7.3 Serial ...
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Omega DRA-DCC-8 - page 4
1. MOUNTING INSTRUCTIONS 2 The DRA-DCC-8 is designed for standard DIN rail mounting. Place the unit on the upper par t of the mounting rail with the fastening tab facing down. Using a suitable flat screwdriver loosen the tab slightly and attach the unit to the rail. Once the tab is loosened, ensure that the unit is fastened securely in place. 2. RE ...
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Omega DRA-DCC-8 - page 5
3 The DRA-DCC-8 is powered by a DC power supply at a range of 15-32Vdc. In order to determine the minimum supply voltage, use the following equation: Vmin = 8 + Rload( Ω ) * 0.02 where: Vmin is the minimum required supply voltage. Rload( Ω ) is the maximum output load including the leads resistance. Note: If Vmin turns to be less than 15V , the ...
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Omega DRA-DCC-8 - page 6
4 Figure 2. SW5 MSB Self T est Mode * according to para #5.2 6. P ARALLEL CONTROL MODE * according to para #5.2 In the parallel control mode, the DRA-DCC-8 unit is controlled via a 15 bit bus. Three Address bits (A0-A3) select the proper current output channel and 12 Data bits (D0-D11) determine its value (A0 and D0 are MSB). The DRA-DCC-8 micropro ...
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Omega DRA-DCC-8 - page 7
5 6.2 THE "E" (ENABLE) TERMINAL For E="1" the unit is enabled, which means that all input vectors are received and the output is updated. When E="0" the unit ignores any new input vector . The E terminal is recommended to be used as a strobe for parallel data which has a long setup time. In this case the following sequ ...
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Omega DRA-DCC-8 - page 8
6 7.4.1 BAUD RA TE SELECT SW1 and SW2 select one out of four available baud rates. 300 BPS 4800 BPS 9600 BPS 19200 BPS OFF SW1 SW2 OFF ON OFF OFF ON ON ON 7.4.2 ID CODE Up to eight DRA-DCC-8s can be connected in a multidrop configuration. Switches SW3, SW4, and SW5 (MSB) set the ID code. 7.4.3 COMMAND FORMA TS Without echo back The host computer se ...
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Omega DRA-DCC-8 - page 9
7 Note: If the value is omitted it will be treated as zero. Separators such as blanks or commas are not allowed. Example: Channel 4 in DRA-DCC-8 no. 7 has to receive the value of 981. Echo back is required The command format is: [C] [7] [4] [981] [CR] The echo back will be: C 7 4 Note: The channel numbers on the DRA-DCC-8 front panel are designated ...
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Omega DRA-DCC-8 - page 10
8 8.1 SELF TEST #1 (Communication Por ts T est) In order to test the serial communication por ts, this test mode converts the unit to a transponder for ASCII characters. Any transmitted character will be echoed to the host terminal. The host parameters should be set to: Baud rate : 4800, W ord length: 8 bits, Parity: even, Stop bit: 1 8.2 SELF TEST ...
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Omega DRA-DCC-8 - page 11
9 11. DRA-DCC-8 CALIBRA TION Generally there is no need to calibrate the DRA-DCC-8 unit. However if calibration is required, the following steps should be carried out: T wo potentiometer trimmers, one for "Zero" and the other for "Span" are located on printed card 7040. The trimmer close to the card edge is the "Zero". ...
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Omega DRA-DCC-8 - page 12
10 INPUTS: P ARALLEL INPUTS LOGIC LEVELS: DA T A HOLD TIME: MAXIMUM P ARALLEL INPUT RA TE: SERIAL COMMUNICA TION BAUD RA TES: P ARITY : STOP BIT : ST A TUS REPORT : MUL TIDROP CAP ABILITY : OUTPUTS: OUTPUT CURRENT SP AN: OUTPUT CURRENT SETTLING TIME: POWER SUPPL Y : CURRENT CONSUMPTION: MAXIMUM LOOP RESIST ANCE: ACCURACY : RESOLUTION: INDICA TORS: ...
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Omega DRA-DCC-8 - page 13
RETURN REQUESTS / INQUIRIES Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBT AIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SER VICE DEP ARTMENT (IN ORDER TO A VOID PROCESSING DELA YS). The assigned AR number should then be marked o ...
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Omega DRA-DCC-8 - page 14
Where Do I Find Ever ything I Need for Pr ocess Measurement and Control? OMEGA…Of Course! TEMPERA TURE ⻬ Thermocouple, R TD & Thermistor Probes, Connectors, Panels & Assemblies ⻬ W ire: Thermocouple, R TD & Thermistor ⻬ Calibrators & Ice Point References ⻬ Recorders, Contr ollers & Process Monitors ⻬ Infrared Pyr ome ...
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