User’s Guide http://www.omega.com e-mail: info@omega.
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Contents 1. MOUNTING INSTRUCTIONS 2. REPLACING FUSES 3. ASSEMBLY 4. SUPPLY VOLTAGE 5. MODES OF OPERATION 5.1 0-20 or 4-20mA output current selection 5.2 Switch Settings 6. PARALLEL CONTROL MODE 6.1 PLC Interface 6.2 The "E" (ENABLE) Terminal 7. SERIAL CONTROL MODE 7.1 RS232c / RS422 Select 7.2 RS422 Termination 7.3 Serial Control Switch Settings 7.4 Serial Communication Parameters 7.4.1 Baud Rate Select 7.4.2 ID Code 7.4.3 Command Formats 8. SELF TEST MODES 8.1 Self Test # 1 8.2 Self Test # 2 8.
1. MOUNTING INSTRUCTIONS The DRA-DCC-8 is designed for standard DIN rail mounting. Place the unit on the upper part 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. REPLACING FUSES In order to replace a blown fuse, the unit has to be disassembled, as follows: a.
4. SUPPLY VOLTAGE 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 minimum required voltage should be 15 Vdc. 5.
Serial Control Mode BAUD RATE (BPS) 300 4800 9600 19200 SW5 MSB S1 OFF ON OFF ON MODE SELF TEST#1 SELF TEST#2 SELF TEST#3 S2 S3 S4 S5 OFF OFF UNIT ID CODE ON ON S6 S7 ON=4-20mA ON ON OFF=0-20mA ON ON Self Test Mode S1 ON OFF S2 OFF ON ON ON S3 S4 X X S5 S6 X * S7 OFF OFF * OFF S6 * S7 OFF X * according to para #5.2 6. PARALLEL CONTROL MODE MODE PARALLEL MODE S1 OFF S2 OFF S3 S4 X S5 * according to para #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 sequence is recommended: prior to applying a new vector, the E terminal should be set to logical 0 (inhibit state), then the new input vector should be imposed.
7.4.1 BAUD RATE SELECT SW1 and SW2 select one out of four available baud rates. SW1 SW2 300 BPS 4800 BPS OFF ON OFF OFF 9600 BPS 19200 BPS 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 FORMATS Three types of command formats are available: Without echo back The host computer sends a massage and does not receives an acknowledgment.
[C] [ID CODE CHANNEL] [LF] [CR] 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 from 1 to 8, in binary they are designated from 0 to 7.
8.1 SELF TEST #1 (Communication Ports Test) In order to test the serial communication ports, 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, Word length: 8 bits, Parity: even, Stop bit: 1 8.2 SELF TEST #2 (Same Leve)l In this test mode, the DRA-DCC-8 unit ignores the address field. All the outputs are set according to the data field only. 8.
The channel LEDs are connected in series with the output current so that they will light only as an indication of a closed current loop. Note: After every power on, the unit is reset and the initialized default output currents are according to the SW6 setting (see para #5.2). In the parallel control mode, internal pull-up resistors on each of the input terminals keep them in logical 1 state. The unit will recognize input voltage up to 0.5V as logical 0 and voltages from 4V to 60V as logical 1. 11.
. SPECIFICATIONS 10 INPUTS: PARALLEL INPUTS Parallel & Serial control inputs 3 - Output current loop address 12 - Output current value (Data) 1- Enable (E) LOGIC LEVELS: 0<"0"<0.
WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit should malfunction, it must be returned to the factory for evaluation.
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