Page 2 - Contents
Contents I NTRODUCTION ..........................................................................1 O VERVIEW ................................................................................................ 1 W HAT ’ S I NCLUDED ...........................................................................
Page 4 - Introduction; Overview
Introduction OMG-USB-SER-2 Page 1 Introduction Overview The OMG-USB-SER-2 equips the PC with 2 USB to RS-232/422/485 Asynchronous serial ports providing a versatile interface for common serial needs. The advantage of this product over more traditional approaches is that it does not require opening t...
Page 5 - Installation; Operating System Installation; Install Software; System Installation; New Hardware Found
Installation OMG-USB-SER-2 Page 2 Installation Operating System Installation Choose Install Software at the beginning of the CD and install SeaCOM . System Installation The screen captures below are taken from a Windows 98 installation. Your particular operating system may differ slightly from what ...
Page 7 - Configuration; Original configuration
Configuration OMG-USB-SER-2 Page 4 Configuration Original configuration This device ships with the following configuration. 422 mode, 120 ohm termination, 1K ohm pull up on RX+ 1K ohm pull down on RX- In order to change this configuration the box must be opened. Do this by removing the four screws l...
Page 8 - PU
Configuration OMG-USB-SER-2 Page 5 Switch Descriptions Figure 1: Switch SW4 L 485 option, OFF for 422. OFF: No effect ON : Connects TX+ to RX+ for two -wire operation L 485 option, OFF for 422. OFF: No effect ON : Connects TX- to RX- for two -wire operation PU 485 option, OFF for 422. OFF: No effect...
Page 9 - Switch Examples; NE
Configuration OMG-USB-SER-2 Page 6 Switch Examples Figure 2: RS422/485 Interface Configuration 485 Mode Selection OFF : 422 Mode The transmitter lines TX+ and TX- are always driven ON : 485 Mode The transmitter lines TX+ and TX- are switched to high impedance when the device is not actively transmit...
Page 10 - Switch Examples Continued
Configuration OMG-USB-SER-2 Page 7 Switch Examples Continued Port 2 Port 1 Figure 3: Electrical Interface Configuration Port 1 : RS-232 The corresponding shunt is in the 232 position. The switches will have no effect. Port 2 : RS-485 two wire communication with no echo. The corresponding shunt is in...
Page 11 - Technical Description; Features; Signal
Technical OMG-USB-SER-2 Page 8 Technical Description The OMG-USB-SER-2 utilizes two USB UARTs. These chips feature programmable baud rate, data format, 128 byte Dual Port TX Buffer, and 384 byte Dual Port RX Buffer. The RS-232/422/485 transceiver supports data rates up to 921.6K baud for RS-422/485 ...
Page 12 - Specifications; Environmental Specifications; Specification; Manufacturing
Specifications OMG-USB-SER-2 Page 9 Specifications Environmental Specifications Specification Operating Storage Temperature Range 0º to 50º C (32º to 122º F) -20º to 70º C (-4º to 158º F) Humidity Range 10 to 90% R.H. Non-Condensing 10 to 90% R.H. Non-Condensing Manufacturing • All Printed Circuit b...
Page 13 - Appendix A - Troubleshooting
Appendix A – Troubleshooting OMG-USB-SER-2 Page 10 Appendix A - Troubleshooting Serial Utility test software is supplied with the adapter and will be used in the troubleshooting procedures. Using this software and following these simple steps, most common problems can be eliminated without the need ...
Page 14 - Appendix B - How To Get Assistance
Appendix B – How To Get Assistance OMG-USB-SER-2 Page 11 Appendix B - How To Get Assistance Please refer to Appendix A - Troubleshooting prior to calling Technical Support. 1. Read this manual thoroughly before attempting to install the adapter in your system. 2. When calling for technical assistanc...
Page 15 - Appendix C - Electrical Interface
Appendix C - Electrical Interface OMG-USB-SER-2 Page 12 Appendix C - Electrical Interface RS-232 Quite possibly the most widely used communication standard is RS-232. This implementation has been defined and revised several times and is often referred to as RS-232 or EIA/TIA -232. The IBM PC compute...
Page 16 - Active
Appendix C - Electrical Interface OMG-USB-SER-2 Page 13 RS-485 RS-485 is backwardly compatible with RS-422; however, it is optimized for partyline or multi-drop applications. The output of the RS-422/485 driver is capable of being Active (enabled) or Tri-State (disabled). This capability allows mult...
Page 17 - Appendix D - Asynchronous Communications
Appendix D - Asynchronous Communications OMG-USB-SER-2 Page 14 Appendix D - Asynchronous Communications Serial data communications implies that individual bits of a character are transmitted consecutively to a receiver that assembles the bits back into a character. Data rate, error checking, handsha...
Page 18 - Appendix E - Compliance Notices; Federal Communications Commission Statement; Caution
Appendix E - Compliance Notices OMG-USB-SER-2 Page 15 Appendix E - Compliance Notices Federal Communications Commission Statement This equipment has been tested and found to comply with the limits for Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide ...
Page 19 - EMC Directive Statement
Appendix E - Compliance Notices OMG-USB-SER-2 Page 16 EMC Directive Statement Products bearing the CE Label fulfill the requirements of the EMC directive (89/336/EEC) and of the low-voltage directive (73/23/EEC) issued by the European Commission. To obey these directives, the following European stan...
Page 20 - RETURN REQUESTS/INQUIRIES; WARRANTY
WARRANTY/ DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for aperiod 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...
