MADE IN User’s Guide Shop online at omega.com e-mail: info@omega.com For latest product manuals: omegamanual.
OMEGAnet ® Online Service omega.com Internet e-mail info@omega.com Servicing North America: U.S.A.: ISO 9001 Certified Canada: One Omega Drive, Box 4047 Stamford, CT 06907-0047 Tel: (203) 359-1660 e-mail: info@omega.com 976 Bergar Laval (Quebec) H7L 5A1, Canada Tel: (514) 856-6928 e-mail: info@omega.ca FAX: (203) 359-7700 FAX: (514) 856-6886 For immediate technical or application assistance: U.S.A.
DIN-191 and DIN-192 SERIES CONVERTER BOXES USERS MANUAL REVISED: 10-30-00 Omega Engineering One Omega Drive P O Box 4047 Stamford, CT 06907 Phone: 1-800-DAS-IEEE Fax: 203-359-7990 e-mail: das@omega.com www.omega.com The information in this publication has been carefully checked and is believed to be accurate; however, no responsibility is assumed for possible inaccuracies or omissions.
3 DIN-191 & DIN-192 USERS MANUAL GENERAL DESCRIPTION The DIN-191 and DIN-192 series converter boxes convert RS-232 communications signal levels to the correct electrical signals required by RS-485. The RS-485 communications standard is recommended when many modules, or other addressable devices, must be connected to a host computer over long distances. The DIN-191 and DIN-192 converters allow communications bus lengths up to 4,000 meters and baud rates up to 115K baud using one twisted pair of wires.
DIN-191 & DIN-192 USERS MANUAL 4 SPECIFICATIONS Max common mode voltage: 500Vrms, 60s duration. Baud rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 (Dip -switch selectable). Temperature range (operating & storage): -25 to +70°C. Relative humidity: 0 - 95% noncondensing. Warranty: 12 months on workmanship and materials. Power Specifications Power requirements: Regulated +5Vdc. Power consumption: 1.0W Max (RS-485 driver on).
5 DIN-191 & DIN-192 USERS MANUAL The DIN-191 female RS-232 connector utilizes five connections: Transmit pin 2 Receive pin 3. Ground pin 5. Data Set Ready (DSR) pin 6 Clear To Send (CTS) pin 8 Both the Data Set Ready (DSR) input pin #6 and Clear To Send (CTS) input pin #8 are internally biased to their active state thru a 330Ω resistor to +5Vdc. To easily connect to any host PC computer, a straight thru RS-232 cable can be used.
DIN-191 & DIN-192 USERS MANUAL 6 isolated RS-485 input data lines will be re-amplified and retransmitted on the RS-485 OUT data lines. . RS-485 Output RS-485 Input Figure 1B Connections for DIN-192. BAUD RATE The DIN-191 and DIN-192 series converters contain a 10-position DIP switch located on the bottom of each unit. The DIP switch is used to select the correct communications baud rate and must be set to the same value as the devices connected to the RS-485 data lines.
7 DIN-191 & DIN-192 USERS MANUAL Figure 2. RS-485 biasing & termination resistors. RS-485 TERMINATION & BIASING SETTINGS Proper termination and biasing of any RS-485 based system can be performed by properly enabling the correct resistors inside each DIN-191 or DIN-192. Figures 3.0 and 4.0 show the location of the jumpers on the printed circuit board. The jumpers are shown in their factory set locations to enable the selected resistors.
DIN-191 & DIN-192 USERS MANUAL 8 FIGURE 4. DIN-192 jumper locations. FACTORY RS-485 TERMINATION SETTINGS Each DIN-191 and DIN-192 contains internal pin strips for enabling the internal termination and biasing resistors. Each pc board is clearly marked with the jumper designators adjacent to each row of pins. The jumper designators are +1K, 220 and -1K. To enable any resistor, place a jumper over the pins next to the required designator. The factory switch and jumper settings are outlined below.
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’s 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 malfunctions, it must be returned to the factory for evaluation.
Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! Shop online at omega.
