SeaLevel ULTRA COMM+422 User manual

COMM+422™
USER’S MANUAL
Part Number 3067
Sealevel Systems, Inc Phone: [phone]
155 Technology Place Fax: [phone]
P.O. Box 830 www.sealevel.com
Liberty, SC 29657

Contents
INTRODUCTION........................................................................ 1
OVERVIEW ...........................................................................................1
WHAT’S INCLUDED .............................................................................1
FACTORY DEFAULT SETTINGS .............................................................1
CARD SETUP............................................................................. 2
ADDRESS SELECTION ...........................................................................2
IRQ SELECTION...................................................................................3
RS-485 ENABLE.................................................................................4
INSTALLATION.......................................................................... 5
OPERATING SYSTEM INSTALLATION....................................................5
TECHNICAL DESCRIPTION ....................................................... 6
FEATURES ...........................................................................................6
CONNECTOR PIN ASSIGNMENTS...........................................................6
MODEM CONTROL SIGNAL CONSIDERATIONS......................................6
SPECIFICATIONS....................................................................... 7
ENVIRONMENTAL SPECIFICATIONS......................................................7
POWER CONSUMPTION........................................................................7
MEAN TIME BETWEEN FAILURES (MTBF)..........................................7
PHYSICAL DIMENSIONS.......................................................................7
APPENDIX A -TROUBLESHOOTING......................................... 8
APPENDIX B -HOW TO GET ASSISTANCE............................. 10
APPENDIX C -ELECTRICAL INTERFACE................................ 11
RS-422............................................................................................11
RS-485............................................................................................11
APPENDIX D -ASYNCHRONOUS COMMUNICATIONS ............ 12
APPENDIX E -SILK-SCREEN.................................................. 13
APPENDIX F -SCHEMATIC..................................................... 14
WARRANTY............................................................................ 16

Figures
Figure 1 -Address Selection Table..................................................................2
Figure 2 -DIP-Switch Illustration.....................................................................2
Figure 3 -Port to Connector Table...................................................................3
Figure 4 -Header E1.........................................................................................3
Figure 5 -Header E2.........................................................................................4
Figure 6 -Connector Pin Assignments.............................................................6
Figure 7 -Asynchronous Communications Bit Diagram...............................12
© 2001d Sealevel Systems, Incorporated. All rights reserved.

Introduction
Sealevel Systems COMM+422 Page 1
Introduction
Overview
The Sealevel Systems COMM+422 provides the PC with four
RS-422/485 asynchronous communication ports. The COMM+422
allows for connection to any device utilizing the RS-422/485 electrical
interface, such as modems, data-entry terminals, and programmable logic
controllers.
What’s Included
The COMM+422 is shipped with the following items. If any of these
items are missing or damaged, contact the supplier.
•(1) COMM+422 serial interface adapter card
•(1) DB-9 cable assembly
•(1) 3.5” Serial Utility Diskette
•User manual
Factory Default Settings
TheCOMM+422 factory default settings are as follows:
Base Address IRQ
Port 1 2E0 3
Port 2 2E8 3
Port 3 2EF 3
Port 4 2F8 3
To install the COMM+422 using factory default settings, refer to
Installation on page 5.
For your reference, record installed COMM+422 settings below:
Base Address IRQ
Port 1
Port 2
Port 3
Port 4

Card Setup
Sealevel Systems COMM+422 Page 2
Card Setup
The COMM+422 contains several jumper straps for each port which must
be set for proper operation.
Address Selection
The COMM+422 occupies 32 consecutive I/O locations. The DIP-switch
is used to set the base address for these locations. Be careful when
selecting the base address as some selections conflict with existing PC
ports. The following table shows several examples that usually do not
cause a conflict.
Address Switch Settings
12345
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 1-Address Selection Table
Refer to Appendix A for common address contentions. The 2E0-2FF
setting in conjunction with an IRQ3 interrupt selection will let the PC
recognize COM2:(2F8) and COM4:(2E8).
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.
ON
`
A9
1 2 3 4 5
A5
Figure 2-DIP-Switch Illustration

Card Setup
Sealevel Systems COMM+422 Page 3
Port # Connector Location Address Example (Base=280)
1J1 Base+0 280-287
2J2 Base+8 288-28F
3J3 Base+16 290-297
4J4 Base+24 298-29F
Figure 3-Port to Connector Table
IRQ Selection
The COMM+422 has an interrupt selection jumper which should be set
prior to use if an interrupt is required by your application software.
Consult the user manual for the application software being used to
determine the proper setting. The four interrupts are OR'ed together to
form a single interrupt request (IRQ). This signal is converted to open
collector active high pull-up allowing multiple COMM+422 adapters to
share the same IRQ line. The IRQ can be set at jumper E1 for IRQ 2/9, 3,
4, or 5. In the following example, the IRQ is set as IRQ3.
3
4
5
2/9
E1
:
Figure 4-Header E1, IRQ Selection shown. (IRQ3 Selected )
Note: The actual silk-screen for the COMM+422 may have a “2” in place
of the IRQ “2/9” selection.

Card Setup
Sealevel Systems COMM+422 Page 4
RS-485 Enable
Header E2 selects whether the RS-485 driver is enabled by the UART
signal Request To Send (RTS) or is always enabled. With the jumper
installed, RTS enables the driver. Removing the jumper enables the driver
regardless of RTS. These jumpers should only be installed if you are
running the board in a multi-drop polled environment such as RS-485.
For normal point to point RS-422 (such as terminal emulation), remove
these jumpers.
1234
E2
Figure 5-Header E2 (RTS enable)
Note: Each port on the COMM+422 can be independently selected as RS-
422 or RS-485. The number below Header E2 represents the port
number (i.e. 1 = Base address, 2 = Base+8 etc.) that is effected
when the jumper is installed. In the above example all ports are set
to “Driver permanently enabled”. This is the default for Header
E2.

Installation
Sealevel Systems COMM+422 Page 5
Installation
The COMM+422 can be installed in any of the PC expansion slots. The
COMM+422 contains several jumper straps for each port which must be
set for proper operation.
1. Turn off PC power. Disconnect the power cord.
2. Remove the PC case cover.
3. Locate an available slot and remove the blank metal slot cover.
4. Gently insert the COMM+422 into the slot. Make sure that the
adapter is seated properly.
5. Install the COMM+422 in a slot, and then install the extra two port
cable bracket in the slot toward the power supply from the board.
6. Replace the cover.
7. Connect the power cord.
Installation is complete.
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.

Technical Description
Sealevel Systems COMM+422 Page 6
Technical Description
The COMM+422 provides four RS-422/485 serial ports, each utilizing a
16550 UART. This chip features programmable baud rate, data format,
interrupt control and a 16 byte input and output FIFO. TheCOMM+422 is
configured as four consecutively addressed UARTs with full RS-422/485
signal drivers and receivers.
Features
•Four RS-422/485 ports
•Selectable interrupts (IRQs) 2/9, 3, 4, 5
•Multiple cards or ports can share the same IRQ
•16550 UART standard
Connector Pin Assignments
Signal Name Pin # Mode
GND Ground 5
TX + Transmit Data Positive 4Output
TX-Transmit Data Negative 3Output
RTS+ Request To Send Positive 6Output
RTS-Request To Send Negative 7Output
RX+ Receive Data Positive 1Input
RX-Receive Data Negative 2Input
CTS+ Clear To Send Positive 9Input
CTS-Clear To Send Negative 8Input
Figure 6-Connector Pin Assignments
Modem Control Signal Considerations
Some software packages require the use of the modem handshake signals.
The COMM+422 provides modem control signals Request ToSend (RTS)
and Clear To Send (CTS). The signal CTS is biased via a resistor network
to a “True” or “On” state when left disconnected. All other modem
control signals associated with the UART are tied to the “True” or “On”
state. This configuration will typically satisfy the modem control signal
requirements for most communications software.
.