ULTRA 485™ USER MANUAL Part #3055 Sealevel Systems, Inc. PO Box 830 Liberty, SC 29657 USA Telephone: (864) 843-4343 Fax: (864) 843-3067 www.sealevel.
Contents INTRODUCTION ........................................................................ 1 OVERVIEW ......................................................................................1 WHAT’S INCLUDED.........................................................................1 FACTORY DEFAULT SETTINGS ........................................................1 CARD SETUP ............................................................................ 2 ADDRESS SELECTION ....................................
APPENDIX F - COMPLIANCE NOTICES .................................. 20 FEDERAL COMMUNICATIONS COMMISSION STATEMENT...............20 EMC DIRECTIVE STATEMENT ......................................................20 WARRANTY ............................................................................ 21 Figures Figure 1 - Header E1, IRQ Selection ........................................................3 Figure 2 - Header E2, Normal IRQ Mode................................................
Introduction Introduction Overview The Sealevel Systems ULTRA 485 provides the PC with an additional RS-422/485 serial port for terminals, PLC communication, laboratory instrumentation, etc. The unique feature of the ULTRA 485 is the ability to be RS-485 compatible without the need for special software or drivers. This is especially useful in Windows, Windows NT, and OS/2 environments where the lower level I/O control is abstracted from the application program.
Card Setup Card Setup The ULTRA 485 contains several jumper straps that must be set for proper operation. Address Selection The ULTRA 485 occupies 8 consecutive I/O locations, and looks to the PC as a standard serial port. A DIP-switch (SW1) is used to set the port address options for the ULTRA 485. Be careful when selecting the port addresses as some selections may conflict with existing ports. The following table shows the addressing options available with the standard PAL.
Card Setup IRQ Selection Header E1 selects the interrupt request for each serial port. If COM1: is selected, the corresponding jumper must be on the IRQ4 setting. If COM2: is selected, the corresponding jumper must be on IRQ3. Note: Most communications software applications default COM3: to IRQ4 and COM4: to IRQ3. This requires the sharing of interrupts between COM1: and COM3:, and between COM2: and COM4:. While this is the default, it is not always the preferred setting.
Card Setup Interrupt Modes Header E2 selects the interrupt mode for the ULTRA 485. ‘N’ indicates the (N)ormal, single interrupt per port mode. ‘S’ Indicates the (S)hared interrupt mode, which allows more than one port to access a single IRQ. Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting and setting the appropriate selections at E1. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper.
Card Setup RS-485 Enable Modes RS-485 is ideal for multi-drop or network environments. RS-485 requires a tri-state driver (not dual-state) that will allow the electrical presence of the driver to be removed from the line. The driver is in a tri-state or high impedance condition when this occurs. Only one driver may be active at a time and the other driver(s) must be tri-stated. The output modem control signal Request To Send (RTS) is typically used to control the state of the driver.
Card Setup Header E3 is used to control the RS-485 enable/disable functions for the receiver circuit. The RS-485 ‘Echo’ is the result of connecting the receiver inputs to the transmitter outputs. Every time a character is transmitted, it is also received. This can be beneficial if the software can handle echoing (i.e. using received characters to throttle the transmitter) or it can confuse the system if the software does not.
Card Setup Connector Pin Assignments EIA-530 DIP-shunt E4 selects the pin out for the DB-25 connector P3.
Card Setup SIO-485 With the 5-position shunt in the SIO-485 mode, the ULTRA 485 is compatible with the Sealevel Systems SIO-485 (part# 3054) with the following signals supported: E4 EIA-530 SIO-485 Figure 7 - DIP-shunt E4 (SIO-485 Mode) Signal GND TDB TDA RDB RDA / TX+ TXRX+ RX- Name Ground Transmit Positive Transmit Negative Receive Positive Receive Negative Sealevel Systems ULTRA-485 Pin # 7 24 25 12 13 Mode Output Output Input Input Page 8
Card Setup Line Termination Typically, each end of the RS-485 bus must have line terminating resistors (RS422 terminates at the receive end only). A 100-ohm resistor is across each RS530/422/485 input in addition to a 1K ohm pull-up/pull-down combination that biases the receiver inputs. DIP-switch SW2 provides the ability to customize this interface to system requirements. Each switch position corresponds to a specific portion of the interface.
Installation Installation Operating System Installation For Windows Users Start by choosing Install Software at the beginning of the CD. Choose Asynchronous COM: Port Software, SeaCOM. Other Operating Systems Refer to the appropriate section of the Serial Utilities Software.System Installation The ULTRA 485 can be installed in any of the PC expansion slots. The ULTRA 485 contains several jumper straps for each port that must be set for proper operation. 1. 2. 3. 4. 5. 6. 7. Turn off PC power.
Technical Description Technical Description The ULTRA 485 utilizes the 16550 UART. This chip features programmable baud rates, data format, interrupt control and a 16-byte input and output FIFO. A full array of advanced UARTS is also available. The unique feature of the ULTRA 485 is the ability to be RS-485 compatible without the need for special software or drivers.
Specifications Specifications Environmental Specifications Specification Temperature Range Humidity Range Operating 0º to 50º C (32º to 122º F) 10 to 90% R.H. Non-Condensing Storage -20º to 70º C (-4º to 158º F) 10 to 90% R.H. Non-Condensing Manufacturing • All Sealevel Systems Printed Circuit boards are built to U.L. 94V0 rating and are 100% electrically tested. These printed circuit boards are solder mask over bare copper or solder mask over tin nickel.
Appendix A - Troubleshooting Appendix A - Troubleshooting Serial Utility test software is supplied with the Sealevel Systems adapter and will be used in the troubleshooting procedures. By using this software and following these simple steps, most common problems can be eliminated without the need to call Technical Support. 1. Identify all I/O adapters currently installed in your system. This includes your on-board serial ports, controller cards, sound cards etc.
Appendix A - Troubleshooting 8. The following are known I/O conflicts: • • • • • • The 278 and 378 settings may conflict with your printer I/O adapter. 3B0 cannot be used if a Monochrome adapter is installed.
Error! Reference source not found. Appendix B - How To Get Assistance Please refer to Troubleshooting Guide prior to calling Technical Support. 1. Begin by reading through the Trouble Shooting Guide in Appendix A. If assistance is still needed please see below. 2. When calling for technical assistance, please have your user manual and current adapter settings. If possible, please have the adapter installed in a computer ready to run diagnostics. 3.
Appendix C - Electrical Interface Appendix C - Electrical Interface RS-530 RS-530 (a.k.a. EIA-530) compatibility means that RS-422 signal levels are met, and the pin-out for the DB-25 connector is specified. The EIA (Electronic Industry Association) created the RS-530 specification to detail the pin-out, and define a full set of modem control signals that can be used for regulating flow control and line status.
Appendix C - Electrical Interface 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 multiple ports to be connected in a multi-drop bus and selectively polled. RS-485 allows cable lengths up to 4000 feet and data rates up to 10 Megabits per second. The signal levels for RS-485 are the same as those defined by RS-422.
Appendix D - Asynchronous Communications 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, handshaking, and character framing (start/stop bits) are pre-defined and must correspond at both the transmitting and receiving ends.
Appendix E - Silk-Screen Appendix E - Silk-Screen Sealevel Systems ULTRA-485 Page 19
Appendix F - Compliance Notices Appendix F - Compliance Notices Federal Communications Commission Statement FCC - This equipment has been tested and found to comply with the limits for Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
Warranty Warranty Sealevel Systems, Inc. provides a limited lifetime warranty. Should this product fail to be in good working order at any time during this period, Sealevel Systems will, at it’s option, replace or repair it at no additional charge except as set forth in the following terms. This warranty does not apply to products damaged by misuse, modifications, accident or disaster.
