Impulse 7105 User Manual
Introduction
ULTRA 485.PCI
Users Manual
Part # 7105
Sealevel Systems, Inc. Telephone: 864.843.4343
PO Box 830 Fax: 864.843.3067
Liberty, SC 29657 USA www.sealevel.com
Sealevel Systems ULTRA 485.PCI Page 1
Introduction
Contents
INTRODUCTION ..........................................................................................................................3
OVERVIEW ................................................................................................................................................3
WHAT’S INCLUDED ...................................................................................................................................3
CARD SETUP ..............................................................................................................................4
RS-485 ENABLE MODES ...........................................................................................................................4
CLOCK MODES ..........................................................................................................................................4
BAUD RATES AND DIVISORS FOR THE ‘DIV1’ MODE..................................................................................5
ADDRESS AND IRQ SELECTION .................................................................................................................6
LINE TERMINATION...................................................................................................................................6
INSTALLATION ...........................................................................................................................7
OPERATING SYSTEM INSTALLATION..........................................................................................................7
WINDOWS 95/98/ME/NT/2000/XP...........................................................................................................7
LINUX .......................................................................................................................................................7
QNX .........................................................................................................................................................7
PHYSICAL INSTALLATION ..........................................................................................................................8
TECHNICAL DESCRIPTION ........................................................................................................9
CONNECTOR PIN ASSIGNMENTS ................................................................................................................9
RS-422/485/530 Pin Assignments (DB-25 Male DTE).........................................................................9
SPECIFICATIONS ......................................................................................................................10
ENVIRONMENTAL SPECIFICATIONS..........................................................................................................10
MANUFACTURING ...................................................................................................................................10
POWER CONSUMPTION ............................................................................................................................10
PHYSICAL DIMENSIONS ...........................................................................................................................10
APPENDIX A - TROUBLESHOOTING ........................................................................................11
APPENDIX B - HOW TO GET ASSISTANCE..............................................................................12
APPENDIX C - ELECTRICAL INTERFACE ................................................................................13
RS-422....................................................................................................................................................13
RS-485....................................................................................................................................................13
RS-530....................................................................................................................................................13
A
PPENDIX D - ASYNCHRONOUS COMMUNICATIONS ..............................................................14
PPENDIX E - SILK-SCREEN ...................................................................................................15
A
APPENDIX F - COMPLIANCE NOTICES ....................................................................................16
FEDERAL COMMUNICATIONS COMMISSION STATEMENT .........................................................................16
EMC DIRECTIVE STATEMENT .................................................................................................................16
WARRANTY..............................................................................................................................17
© Sealevel Systems, Inc.
SL9052 Revision 7/2006
Sealevel Systems, Incorporated. All rights reserved.
Sealevel Systems ULTRA 485.PCI Page 2
Introduction
Introduction
Overview
The Sealevel Systems ULTRA 485.PCI is a one channel PCI Bus serial I/O adapter. It provides one field selectable
RS-422/485/530 serial port supporting asynchronous data rates up to 460.8K bps.
Choose the RS-422 mode for long distance device connections up to 4000ft. where noise immunity and high data
integrity are essential. Select RS-485 and capture data from multiple peripherals in a RS-485 multi-drop network. Up
to 31 RS-485 devices can be connected to each port to automate your data collection.
In RS-485 mode, our special auto-enable feature allows the RS-485 ports to be viewed by the operating system as a
COM: port. This allows the standard COM: driver to be utilized for RS-485 communications. Our on-board
hardware automatically handles the RS-485 driver enable.
What’s Included
The ULTRA 485.PCI is shipped with the following items. If any of these items is missing or damaged, contact the
supplier.
• ULTRA 485.PCI Serial I/O Adapter
• Sealevel SeaCOM Software CD
Sealevel Systems ULTRA 485.PCI Page 3
Card Setup
Card Setup
RS-485 Enable Modes
RS-485 is ideal for multi-drop or network environments. RS-485 requires a tri-state driver 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. Some
communication software packages refer to RS-485 as RTS enable or RTS block mode transfer.
One of the unique features of the ULTRA 485.PCI is the ability to be RS-485 compatible without the need for
special software or drivers. This ability is especially useful in Windows and OS/2 environments where the lower
level I/O control is abstracted from the application program. This ability means that the user can effectively use the
ULTRA 485.PCI in an RS-485 application with existing (i.e. standard RS-232) software drivers.
Switch SW2 is used to control the RS-485 mode functions for the driver circuit. The selections are:
‘Auto’ enable (silk-screen ‘AT’). The ‘Auto’ enable feature automatically enables/disables the RS-485 interface via
on board circuitry.
‘RTS’ enable (silk-screen ‘RT’) The ‘RTS’ mode uses the ‘RTS’ modem control signal to enable the RS-485
interface and provides backward compatibility with existing software products.
‘No Echo’ (silk-screen ‘NE’) is used to control the RS-485 enable/disable functions for the receiver circuit and
determine the state of the RS-422/485 driver. 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. To select the ‘No Echo’ mode select silk-screen position ‘NE’.
Clock Modes
The ULTRA 485.PCI employs a unique clocking option that allows the end user to select from divide by 4 and
divide by 1 clocking modes. SW2 positions 1 and 2 select the Divide by 1 (silk-screen D1) and Divide by 4 (silkscreen D4) modes.
To select the Baud rates commonly associated with COM: ports (i.e. 2400, 4800, 9600, 19.2, … 115.2K Bps ) set
switch SW2 in the divide by 4 mode (silk-screen D4).
To select the maximum data rate up to 460.8K bps set switch SW2 in the divide by 1 (silk-screen D1) position.
Please refer to the following page for these additional data rates.
Caution: Do not set both switches on or invalid clocking will occur.
RS-485 Mode and Clock Mode Examples (Switch SW2)
D 1D 4ATR TN
E
ON
OFF
1 2 3 4
5
Figure 1- Switch SW2, RS-422, Divide by 4
Sealevel Systems ULTRA 485.PCI Page 4
Card Setup
D 1D 4ATR TN
E
ON
OFF
1 2 3 4
5
Figure 2 – Switch SW2, RS-485 ‘Auto’ Enabled, with ‘No Echo’ Divide by 4
D 1D 4ATR TN
E
ON
OFF
1 2 3 4
5
Figure 3 - Switch SW2, RS-485 ‘Auto’ Enabled, with ‘Echo’ Divide by 4
Baud Rates and Divisors for the ‘Div1’ mode
The following table shows some common data rates and the rates you should choose to match them if using the
adapter in the ‘Div1’ mode.
For this Data Rate Choose this Data Rate
1200 bps 300 bps
2400 bps 600 bps
4800 bps 1200 bps
9600 bps 2400 bps
19.2K bps 4800 bps
57.6 K bps 14.4K bps
115.2 K bps 28.8K bps
230.4K bps 57.6 K bps
460.8K bps 115.2 K bps
If your communications package allows the use of Baud rate divisors, choose the appropriate divisor from the
following table:
For this Data Rate Choose this Divisor
1200 bps 384
2400 bps 192
4800 bps 96
9600 bps 48
19.2K bps 24
38.4K bps 12
57.6K bps 8
115.2K bps 4
230.4K bps 2
460.8K bps 1
Sealevel Systems ULTRA 485.PCI Page 5
Card Setup
Address and IRQ selection
The ULTRA 485.PCI is automatically assigned resources by your motherboard BIOS. Only the I/O address may be
modified by the user.
Adding or removing other hardware may change the assignment of I/O addresses and IRQs.
Line Termination
Typically, each end of the RS-485 bus must have line-terminating resistors (RS-422 terminates at the receive end
only). A 120-ohm resistor is across each RS-422/485 input in addition to a 1K-ohm pull-up/pull-down combination
that biases the receiver inputs. Switch SW1 allows customization of this interface to specific requirements. Each
switch position corresponds to a specific portion of the interface. If multiple ULTRA 485.PCI adapters are
configured in an RS-485 network, only the boards on each end should have switches T, P & P ON. Refer to the
following table for each position’s operation:
Name Function
T Adds or removes the 120 ohm termination.
P Adds or removes the 1K ohm pull-down resistor in the
RS-422/RS-485 receiver circuit (Receive data only).
P Adds or removes the 1K ohm pull-up resistor in the RS-422/RS-
485 receiver circuit (Receive data only).
L Connects the TX+ to RX+ for RS-485 two-wire operation.
L Connects the TX- to RX- for RS-485 two-wire operation.
P P T L L
ON
OFF
1 2 3 4
Figure 4 - Switch SW1, Line Termination
5
Sealevel Systems ULTRA 485.PCI Page 6
Loading...