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Impulse
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3440
User Manual
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Impulse 3440 User Manual

ULTRA COMM+422™
USER MANUAL
Part #3055
Contents
INTRODUCTION ........................................................................ 1
OVERVIEW......................................................................................1
WHAT’S INCLUDED ........................................................................1
FACTORY DEFAULT SETTINGS ........................................................1
CARD SETUP ............................................................................ 2
ADDRESS SELECTION......................................................................2
JUMPER SELECTIONS ......................................................................4
IRQ Selection..............................................................................4
INTERRUPT MODES.........................................................................5
RS-485 ENABLE MODES ................................................................6
Interface Mode Examples J1D – J4D .........................................7
Interface Mode Examples J1D – J4D (continued) ......................8
LINE TERMINATION ........................................................................9
CLOCK MODES .............................................................................10
BAUD RATES AND DIVISORS FOR THE ‘DIV1’ MODE .....................11
BAUD RATES AND DIVISORS FOR THE ‘DIV2’ MODE .....................12
INSTALLATION ....................................................................... 13
OPERATING SYSTEM INSTALLATION .............................................13
For Windows Users ..................................................................13
Other Operating Systems ..........................................................13
TECHNICAL DESCRIPTION .................................................... 14
FEATURES.....................................................................................14
INTERRUPTS .................................................................................15
WHY USE AN ISP? ........................................................................16
CONNECTOR PIN ASSIGNMENTS ...................................................17
DB-9 Pin Assignments.............................................................. 17
DB-37 Connector Pin Assignments ..........................................17
SPECIFICATIONS .................................................................... 18
ENVIRONMENTAL SPECIFICATIONS ............................................... 18
MANUFACTURING.........................................................................18
POWER CONSUMPTION .................................................................18
MEAN TIME BETWEEN FAILURES (MTBF)...................................18
PHYSICAL DIMENSIONS ................................................................18
A
PPENDIX A - TROUBLESHOOTING ...................................... 19
PPENDIX B - HOW TO GET ASSISTANCE............................ 21
A
A
PPENDIX C - ELECTRICAL INTERFACE .............................. 22
RS-422......................................................................................... 22
RS-485......................................................................................... 22
APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ............ 23
APPENDIX E - SILK-SCREEN ................................................. 24
APPENDIX F - COMPLIANCE NOTICES .................................. 25
FEDERAL COMMUNICATIONS COMMISSION STATEMENT .............. 25
EMC DIRECTIVE STATEMENT ......................................................25
WARRANTY............................................................................ 26
Figures
Figure 1 - Available Address Combinations............................................2
Figure 2 - Address Selection Table...........................................................3
Figure 3 - Port to Connector Table ..........................................................3
Figure 4 - Header J1A, Normal IRQ Mode ............................................. 5
Figure 5 - Header J1A & J2A, Shared IRQ Mode..................................5
Figure 6- Headers J1D- J4D, RS-422 .......................................................7
Figure 7 - Headers J1D- J4D, RS-485 ‘Auto’ Enabled, with ‘No Echo’7
Figure 8 - Headers J1D- J4D, RS-485 ‘Auto’ Enabled, with ‘Echo’ .....7
Figure 9 - Headers J1D- J4D, RS-485 ‘RTS’ Enabled, with ‘No Echo’ 8
Figure 10 - Headers J1D- J4D, RS-485 ‘RTS’ Enabled, with ‘Echo’ .... 8
Figure 11 - Headers J1E - J4E, Line Termination ..................................9
Figure 12 - Clocking Mode 'Divide By 4’...............................................10
Figure 13 - Clocking Mode 'Divide By 2’...............................................10
Figure 14 - Clocking Mode 'Divide By 1’...............................................10
Figure 15 - Asynchronous Communications Bit Diagram....................23
©Sealevel Systems, Inc. SL9146 Revision 7/2006 Sealevel Systems, Incorporated. All rights reserved.

Introduction

Introduction
Overview
The Sealevel Systems ULTRA COMM+422 provides the PC with four additional RS-422/485 serial ports for terminals, modems, printers, etc.
The unique feature of the ULTRA COMM+422 is the ability to be RS-485 compatible without the need for special software or drivers. This ability is especially useful in Windows, Windows NT, 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 COMM+422 in an RS-485 application with existing (i.e. standard RS-232) software drivers.
Note: The ‘Auto Enable’ feature is not available on the p/n 3441.
What’s Included
The ULTRA COMM+422 is shipped with the following items. If any of these items are missing or damaged, contact the supplier.
• ULTRA COMM+422 Serial I/O Adapter
• DB-37 to four DB-9 ‘Spider Cable’
• Sealevel Software
Factory Default Settings
The ULTRA COMM+422 factory default settings are as follows:
Port # Base Address IRQ Electrical Specification
Port 1 280 10 RS-422 Port 2 288 5 RS-422 Port 3 290 10 RS-422 Port 4 298 5 RS-422
To install the ULTRA COMM+422 using factory default settings, refer to Installation on page 13.
For your reference, record installed ULTRA COMM+422 settings below:
Port # Base Address IRQ Electrical Specification
Port 1 Port 2 Port 3 Port 4
Sealevel Systems ULTRA COMM+422 Page 1
Card Setup

Card Setup

The ULTRA COMM+422 contains several jumper straps, which must be set for proper operation.
Address Selection
Each port on the ULTRA COMM+422 occupies eight consecutive I/O locations. A DIP-switch is used to set the base address for these locations.
The ULTRA COMM+422 has a unique addressing scheme that allows it to be completely compatible with Sealevel Systems’ older four port RS-422/485 interface adapter (p/n 3067) and provide for the ability to select address combinations more commonly used.
The first addressing scheme allows the ULTRA COMM+422 to select the addresses for its ports from a table of available address combinations.
The following table shows the addressing combinations available. If different address combinations are required, please contact Sealevel Systems Technical Support about a custom PAL option.
Switch6 Switch7 Switch8 Port
1
On On Off 3F8 2F8 3E8 2E8 On Off On 2F8 3E8 2E8 2E0 On Off Off 3E8 2E8 280 288 Off On On 500 508 510 518 Off On Off 580 588 590 598 Off Off On 1500 1508 1510 1518 Off Off Off 3220 3228 4220 4228 On On On Addresses set up by switches 1-5
Figure 1 - Available Address Combinations
Note: Each COM: port in the system should have a unique address. Typically
COM1: - COM4: addresses are 3F8, 2F8, 3E8 and 2E8 Hex.
Refer to Appendix A for common address contentions.
Sealevel Systems ULTRA COMM+422 Page 2
Port
2
Port
3
Port
4
Card Setup
The second mode of address selection provides the compatibility mode. In this mode the DIP-switch sets the base address and the adapter occupies 32 consecutive I/O locations. The following table illustrates the location of each port and its relationship to the other ports.
Note: For switches 1 - 5 to become active, switches 6, 7 & 8 must be set in the
‘On’ or ‘Up’ position.
Switch Settings
Address lines Æ A9 A8 A7 A6 A5
Address Selected 1 2 3 4 5
280-29F Off On Off On On
2A0-2BF Off On Off On Off
380-39F Off Off Off On On
1A0-1BF On Off Off On Off
2E0-2FF Off On Off Off Off
Figure 2 - Address Selection Table
The following illustration shows the correlation between the DIP-switch setting and the address bits used to determine the base address. In the example below, address 2E0 is selected as a base. Address 2E0 in binary is XX 10 111X XXXX where X = a non-selectable address bit.
A9 A5
ON
OFF
1 2 3 4 5 6 7
Port # Connector Location Address Example (Base=2E0)
1 2 3 4
Sealevel Systems ULTRA COMM+422 Page 3
1 Base+0 2E0-2E7 2 Base+8 2E8-2EF 3 Base+16 2F0-2F7 4 Base+24 2F8-2FF
Figure 3 - Port to Connector Table
8
Card Setup
Jumper Selections
For ease of configuration, the headers are grouped by port. Port one headers have a ‘J1’ prefix; Port two headers have the ‘J2’ prefix, etc. For example, the header that controls the Port one IRQ selection is J1B; the header that controls the Port 2 IRQ selection is J2B. The silk-screen also provides information for configuring the adapter without the use of the manual. This is particularly useful in field re-configuration.
IRQ Selection
Headers J1B through J4B select 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.
34567 101112159
Figure 4 – Headers J1B – J4B, IRQ Selection
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. Check your software configuration instructions to determine the most appropriate IRQ selection.
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 J1A through J4A. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper.
Sealevel Systems ULTRA COMM+422 Page 4
Card Setup
Interrupt Modes
Headers J1A through J4A select the interrupt modes for each port. Each port must be set in the correct mode to insure proper operation.
‘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. ‘M’ indicates the inclusion of a 1K ohm pull-down resistor required on one port when sharing interrupts.
J1A
NM
Figure 4 - Header J1A, Normal IRQ Mode
Set the jumpers to ‘S’ for shared interrupt mode on all blocks sharing an IRQ except one. Set that port block for ‘M’. This provides the pull-down resistor circuit that makes sharing IRQs possible. If you are using more than one ULTRA COMM+422 or a compatible adapter in a bus you should only have one port set to ‘M’. The following example shows two ports sharing a single IRQ.
S
J1A
NSM
J2A
NSM
Figure 5 - Header J1A & J2A, Shared IRQ Mode
Set the jumper to ‘S’ if you are using more than one ULTRA COMM+422 in a bus or to completely remove the pull-down resistor for hardware compatibility.
Setting the adapter in this configuration when it is not accompanied by a pull-down resistor will prevent the ports from triggering an interrupt.
Sealevel Systems ULTRA COMM+422 Page 5
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. Some communication software packages refer to RS-485 as RTS enable or RTS block mode transfer.
One of the unique features of the ULTRA COMM+422 is the ability to be RS­485 compatible without the need for special software or drivers. This ability is especially useful in Windows, Windows NT, 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 COMM+422 in an RS-485 application with existing (i.e. standard RS-232) software drivers.
Headers J1D through J4D are used to control the RS-485 mode functions for the driver circuit. The selections are ‘RTS’ enable (silk-screen ‘RT’) or ‘Auto’ enable (silk-screen ‘AT’). The ‘Auto’ enable feature automatically enables/disables the RS-485 interface. The ‘RTS’ mode uses the ‘RTS’ modem control signal to enable the RS-485 interface and provides backward compatibility with existing software products.
Position 3 (silk-screen ‘NE’) of J1D through J4D 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’.
For RS-422/530/449 compatibility remove the jumpers at J1D through J4D.
Examples on the following pages describe all of the valid settings for J1D - J4D.
Sealevel Systems ULTRA COMM+422 Page 6
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