SeaLevel C4-104 Series User manual

C4-104
USER MANUAL
Part # 3520, 3521, 3522
Sealevel Systems, Inc
155 Technology Place
P.O. Box 830
Liberty, SC 29657 USA
Phone: [phone]
FAX: [phone]
www.sealevel.com
TM

Contents
INTRODUCTION ........................................................................ 1
OVERVIEW ...........................................................................................1
WHAT’S INCLUDED..............................................................................1
FACTORY DEFAULT SETTINGS..............................................................1
OPERATING SYSTEM INSTALLATION ....................................................1
CARD SETUP............................................................................. 2
ADDRESS SELECTION............................................................................2
IRQ SELECTION...................................................................................3
RS-485 MODE (RTS ENABLE)...........................................................4
INTERFACE SELECTION.........................................................................5
RS-232...............................................................................................5
RS-422/485.......................................................................................5
COMBINED RS-232 & RS-422/485..................................................5
INSTALLATION.......................................................................... 6
OPERATING SYSTEM INSTALLATION ....................................................6
For Windows Users.......................................................................6
Other Operating Systems ..............................................................6
SYSTEM INSTALLATION .......................................................................6
TECHNICAL DESCRIPTION ....................................................... 7
FEATURES............................................................................................7
CONNECTOR PIN ASSIGNMENTS ...........................................................7
RS-232 (Male DB9)......................................................................7
RS-422/485....................................................................................8
STATUS PORT......................................................................................8
SPECIFICATIONS....................................................................... 9
ENVIRONMENTAL SPECIFICATIONS.......................................................9
MANUFACTURING................................................................................9
POWER CONSUMPTION........................................................................9
MEAN TIME BETWEEN FAILURES (MTBF)..........................................9
PHYSICAL DIMENSIONS........................................................................9
APPENDIX A -TROUBLESHOOTING....................................... 10
APPENDIX B -HOW TO GET ASSISTANCE............................. 11
APPENDIX C -ELECTRICAL INTERFACE................................ 12
RS-232.............................................................................................12

RS-422.............................................................................................12
RS-485.............................................................................................13
APPENDIX D -PC/104............................................................ 14
WHAT IS PC/104?............................................................................14
APPENDIX E -SILK-SCREEN.................................................. 15
APPENDIX F -SCHEMATIC..................................................... 16
WARRANTY............................................................................ 18
Figures
Figure 1 -Address Selection Table..................................................................2
Figure 2 -Port to Connector Table..................................................................3
Figure 3 -Headers E1, E2, E3, & E4 -IRQ Selection....................................3
Figure 4 -Headers E7 and E8 -RS-485 Enable and Echo Selection.............4
Figure 5 -RS-232 Connector Pin Assignments...............................................7
Figure 6 -RS-422/485 Connector Assignments..............................................8
© 1999i Sealevel Systems, Incorporated. All rights reserved.

Introduction
Sealevel Systems C4-104 Page 1
Introduction
Overview
The Sealevel Systems C4-104 series provides four selectable RS-232 or RS-
422/485 serial I/O ports for your PC/104 application.
What’s Included
The C4-104 is shipped with the following items. If any of these items is
missing or damaged, contact the supplier.
•(1) C4-104 Serial Interface Adapter
•(4) DB-9 Cable Assemblies
•(1) Nylon Hardware Kit
•Serial Utility Software
•User Manual
Factory Default Settings
The C4-104 factory default settings are as follows:
Base Address IRQ
Port 1 280 5
Port 2 288 5
Port 3 290 5
Port 4 298 5
To install the C4-104 using factory default settings, refer to 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 on page 6.
For your reference, record installed C4-104 settings below:
Base Address IRQ
Port 1
Port 2
Port 3
Port 4

Card Setup
Sealevel Systems C4-104 Page 2
Card Setup
The C4-104 contains several jumper straps for each port that must be set for
proper operation. Address Selection
The C4-104 occupies four port addresses with each port occupying 8
consecutive I/O locations. A DIP switch (SW1) is used to set the port address
options for the C4-104. 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. If you do not see an address
option that suits your needs, please contact Sealevel Systems Technical
Support about a custom PAL option.
Port1
J1 Port2 J2 Port3 J3 Port4 J4 SW1 1SW1 2SW1 3SW1 4
3F8 2F8 3E8 2E8 On On On On
2F8 3E8 2E8 2E0 On On On Off
3E8 2E8 280 288 On On Off On
280 288 290 298 On On Off Off
2A0 2A8 2B0 2B8 On Off On On
500 508 510 518 On Off On Off
580 588 590 598 On Off Off On
Figure 1-Address Selection Table
DOS Note: Typically COM1: through COM4: addresses are 3F8, 2F8, 3E8
& 2E8 Hex (this is the first addressing option in the above
table). If a COM1: is already present use the second addressing
option, this will provide the typical addresses for COM2:
through COM4: and a fourth port address at 2E0 Hex
XENIX Note: If COM1: is not installed, use base address 500 Hex and IRQ 4
for COM1:. If COM1: is installed, then select base address 580
Hex and IRQ3 (XENIX COM2:)

Card Setup
Sealevel Systems C4-104 Page 3
Port # Connector Location
1J2
2J3
3J4
4J5
Figure 2-Port to Connector Table
IRQ Selection
Headers E1-E4 select the Interrupt Request (IRQ) for each serial port. E1
selects the IRQ selection for Port 1, E2 for Port 2, E3 for Port 3, and E4 for
Port 4. If COM1: is selected, this jumper must be on the IRQ4 setting. If
COM2: is selected, this jumper must be on IRQ3. Consult your particular
software for IRQ selection. If no interrupt is desired, remove the jumper.
E1 E2 E3 E4
2/9
3
4
5
7
10
11
12
15
R
Figure 3-Headers E1, E2, E3, & E4 -IRQ Selection
Position “R” is provided so that you can install a jumper that connects a 1K
ohm pull-down resistor to the output of a high-impedance tri-state driver that
carries the IRQ signal. Because the IRQ line is driven low only by the pull-
down resistor you can have two or more boards which share the same IRQ
signal. Position “R” installed is the default setting and should be left on unless
multiple ports or cards are sharing a single IRQ. If multiple ports or cards are
sharing a single IRQ then only one pull-down resistor is needed in the circuit.

Card Setup
Sealevel Systems C4-104 Page 4
RS-485 Mode (RTS Enable)
E7 & E8 select whether the RS-485 driver is enabled by the UART signal
Request To Send (RTS) or always enabled. With the jumper installed, RTS
enables the RS-485 driver. Removing the jumper enables the driver regardless
of RTS. The jumper should be installed for a 2/4 wire RS-485 application
where the C4-104 is acting as a polled node on a multi-drop network. Remove
the jumper if you are using a point to point RS-422 application such as
Programmable Logic Controllers (PLC's), etc. Half-duplex two-wire operation
is also possible by connecting TX+ to RX+ and TX-to RX-in your cable hood.
To enable the driver with RTS install jumpers at E7-1 for Port 1, E7-3 for Port
2, E8-1 for Port 3 and E8-3 for Port 4. Failure to correctly set this jumper can
cause transmitter contention problems preventing operation by any nodes on
the network.
Note: By connecting the TX+ to the RX+ and TX-to RX-you will experience a
condition termed RS-485 “Echo”. This means that when you transmit a
data character it will be “Echoed” back through the receiver circuit,
presenting itself as a received data character. This can be useful in RS-
485 communications by providing a benchmark for the end of
transmission (i.e. when the amount of received data available equals the
transmit data count). The RS-485 “Echo” can be disabled at E7 and E8.
To disable the echo install a jumper at E7-2 for Port 1, E7-4 for Port 2,
E8-2 for Port 3 and E8-4 for Port 4.
The following example shows the drivers in the RS-485 mode and the echo
enabled.
1 2 3 4
E7-1Port 1 RS-485 Enable
E7-2Port 1 RS-485 Echo Disable
E7-3Port 2 RS-485 Enable
E7-4Port 2 RS-485 Echo Disable
E8-1Port 3 RS-485 Enable
E8-2Port 3 RS-485 Echo Disable
E8-3Port 4 RS-485 Enable
E8-4Port 4 RS-485 Echo Disable
Figure 4-Headers E7 and E8 -RS-485 Enable and Echo Selection

Card Setup
Sealevel Systems C4-104 Page 5
Interface Selection
Due to the versatility of the C4-104, a wide range of interface configuration
options is available to the end user. Please use this section as a guide in
configuring your board to provide the interface you require.
RS-232
1. Remove the 75174 drivers at U1 & U5.
2. Install MAX204 drivers at U2 & U6.
3. Remove all jumpers at E5 and E6.
RS-422/485
1. Install the 75174 drivers at U1 & U5.
2. Remove MAX204 drivers at U2 & U6.
3. Install all jumpers at E5 and E6.
Combined RS-232 & RS-422/485
Please use the following table as a guide in configuring the C4-104 in this
manner.
Configuration Drivers Headers E5 and E6
Ports 1 & 2 RS-232
Ports 3 & 4 RS-422 U1 & U6 Installed U2 & U5 Removed E6 jumpers Removed E5 jumpers Installed
Ports 1 & 2 RS-422
Ports 3 & 4 RS-232 U2 & U6 Installed U1 & U5 Removed E6 jumpers Installed E5 jumpers Removed

Technical Description
Sealevel Systems C4-104 Page 6
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
Extreme care should be taken when installing the C4-104 to avoid causing
damage to the connectors. After the adapter is installed, connect your I/O
cables to J1-J4. Please note these headers are keyed so that pin 1 of the cable
matches pin 1 of the connector. Refer to Card Setup for information on setting
the address and jumper options before inserting the C4-104 onto the stack.
1. Turn off PC power. Disconnect the power cord.
2. Remove the PC case cover (if applicable).
3. Gently insert the C4-104 connector P1 noting proper key orientation of the
expansion connector on a PC/104 compatible card. The C4-104 adapter is
keyed per the PC/104 Revision 2.1 Specification. This will aid in
preventing the adapter from being inserted incorrectly.
4. Mounting hardware (nylon stand-offs and screws) is provided to insure a
good mechanical connection. Retain any mounting hardware not used to
allow for future expansion.
5. The cables provided are keyed and can be installed before or after the
adapter is inserted in the stack.
6. Replace the cover.
7. Connect the power cord.
Installation is complete.

Technical Description
Sealevel Systems C4-104 Page 7
Technical Description
The C4-104 provides four RS-232 or RS-422/485 serial ports, utilizing a
16554 UART. This chip features programmable baud rates, data format,
interrupt control and a 16-byte input and output FIFO. This UART is essentially
four 16550 compatible UARTs in a 68 pin PLCC package.
Features
•PC/104 compatible “Stack Through” connector for universal mounting.
•5 volt DC operation.
•DB-9P interface cables provided for ease in connecting.
•All mounting hardware provided.
•Supports TD, RD, RTS, CTS signals.
•Compatible with 16550 specific software.
•RS-422 version Part Number: 3520
•RS-232 version Part Number: 3521
•RS-422/232 version Part number: 3522
Connector Pin assignments
RS-232 (Male DB9)
Signal Name Pin #DB9 J1-J4 Mode
GND Ground 5 9
TD Transmit Data 3 5 Output
RTS Request To Send 7 4 Output
RD Receive Data 2 3 Input
CTS Clear To Send 8 6 Input
Figure 5-RS-232 Connector Pin Assignments
Note: These pin assignments meet the EIA/TIA/ANSI-574 DTE for DB-9 type
connectors. These are the only pins that can be connected in your cable
for RS-232. If any other connections are made your data may become
corrupted. If RTS and CTS are not being used terminate them by
connecting the pins together. This will help insure the best performance.