modules provide a powerful way to add I/O to a variety of computers,
controllers, and PLCs. Each SeaI/O model is designed for maximum flexibility and
easy field wiring. Ordering options allow connection to the host device via Wireless
802.11b/g (Coming Soon!), Ethernet, USB, RS-485, or RS-232, and multiple units
can be daisy chained together using convenient pass-through connectors. For easy
software integration, application programs or 3
SeaMAX
TM
library or industry standard Modbus protocol.
rd
party software can use the Sealevel
This manual covers the installation and operation of these SeaI/O products:
Ethernet 10/100 BaseT
SeaI/O-410E – 16 Optically Isolated Inputs/16 Reed Relay Outputs
SeaI/O-420E – 16 Optically Isolated Inputs/8 Form C Outputs
SeaI/O-430E – 32 Optically Isolated Inputs
SeaI/O-440E – 32 Reed Relay Outputs
SeaI/O-450E – 16 Form C Relay Outputs
SeaI/O-462E – 96 Bit TTL I/O (DB-78)
SeaI/O-463E – 96 Bit TTL I/O (50-Pin IDC)
SeaI/O-470E – 8 Inputs/8 Outputs/2 D/A & 16 A/D
SeaI/O-520E – 8 Optically Isolated Inputs/8 High-Current Form C Outputs
USB
SeaI/O-410U – 16 Optically Isolated Inputs/16 Reed Relay Outputs
SeaI/O-420U – 16 Optically Isolated Inputs/8 Form C Outputs
SeaI/O-430U – 32 Optically Isolated Inputs
SeaI/O-440U – 32 Reed Relay Outputs
SeaI/O-450U – 16 Form C Relay Outputs
SeaI/O-462U – 96 Bit TTL I/O (DB-78)
SeaI/O-463U – 96 Bit TTL I/O (50-Pin IDC)
SeaI/O-470U – 8 Inputs/8 Outputs/2 D/A & 16 A/D
SeaI/O-520U – 8 Optically Isolated Inputs/8 High-Current Form C Outputs
RS-485
SeaI/O-410M – 16 Optically Isolated Inputs/16 Reed Relay Outputs
SeaI/O-420M – 16 Optically Isolated Inputs/8 Form C Outputs
SeaI/O-430M – 32 Optically Isolated Inputs
SeaI/O-440M – 32 Reed Relay Outputs
SeaI/O-450M – 16 Form C Relay Outputs
SeaI/O-462M – 96 Bit TTL I/O (DB-78)
SeaI/O-463M – 96 Bit TTL I/O (50-Pin IDC)
SeaI/O-470M – 8 Inputs/8 Outputs/2 D/A & 16 A/D
SeaI/O-520M – 8 Optically Isolated Inputs/8 High-Current Form C Outputs
RS-232
SeaI/O-410S – 16 Optically Isolated Inputs/16 Reed Relay Outputs
SeaI/O-420S – 16 Optically Isolated Inputs/8 Form C Outputs
SeaI/O-430S – 32 Optically Isolated Inputs
SeaI/O-440S – 32 Reed Relay Outputs
SeaI/O-450S – 16 Form C Relay Outputs
SeaI/O-462S – 96 Bit TTL I/O (DB-78)
SeaI/O-463S – 96 Bit TTL I/O (50-Pin IDC)
SeaI/O-470S – 8 Inputs/8 Outputs/2 D/A & 16 A/D
SeaI/O-520S – 8 Optically Isolated Inputs/8 High-Current Form C Outputs
Expansion Units (Connect to Base Unit via RS-485)
SeaI/O-410N – 16 Optically Isolated Inputs/16 Reed Relay Outputs
SeaI/O-420N – 16 Optically Isolated Inputs/8 Form C Outputs
SeaI/O-430N – 32 Optically Isolated Inputs
SeaI/O-440N – 32 Reed Relay Outputs
SeaI/O-450N – 16 Form C Relay Outputs
SeaI/O-462N – 96 Bit TTL I/O (DB-78)
SeaI/O-463N – 96 Bit TTL I/O (50-Pin IDC)
SeaI/O-470N – 8 Inputs/8 Outputs/2 D/A & 16 A/D
SeaI/O-520N – 8 Optically Isolated Inputs/8 High-Current Form C Outputs
SeaI/O modules can be used with industry standard Modbus protocol or easily
controlled from application programs using the supplied SeaMAX software libraries.
Included are two diagnostic and configuration tools: MaxSSD and Ethernet Config.
The SeaMAX library features an object-oriented and functional interface for use with
C++ and Visual Basic. Also included is the CEthernet API library for programmatic
discovery and configuration of Ethernet enabled SeaI/O modules. Refer to the
SeaMAX Application Suite section of this manual for detailed information.
Industry Segments
SeaI/O modules are perfect for a wide variety of applications and environments
including:
Process Control
Data Acquisition
Broadcast Automation
Security
Facility Management
Features
Choice of Connectivity:
o Wireless (802.11b/g) – coming soon!
o Ethernet
o USB
o RS-485
o RS-232
Supports Industry Standard Modbus TCP & RTU Protocols
Models Offering Choice of:
o Optically Isolated Inputs
o Reed Relay Outputs
o Form C Relay Outputs
o TTL Interfaces
o Analog A/D & D/A
Status Indicator LEDs for Communication, Fault, and Status
Field Removable Terminal Block Connectors (most models)
9-30VDC Power Input
Power Input via Terminal Block or DC Jack
Daisy Chain up to 247 Modules
Extended Temperature Available (-40°C to +85°C)
Rugged Metal Enclosure
Compact Size - 7.5"(L) x 5.1"(W) x 1.3"(H)
Din Rail or Table Mount
After the Base unit is installed, up to 246 additional SeaI/O N-Series Expansion
Units can be added to create an I/O network. These expansion modules interface via
RS-485 and can be located local to the Base SeaI/O device or remotely located up to
4000 feet away. Local installations should use the 5” CAT5 RS-485 pass-through
cable (Item number CA239) shipped with each N-series module to connect. Remote
expansion modules should use RS-485 twisted pair wiring from the Base unit
connected via the removable screw terminal connector.
For local installations power to the expansion modules is supplied from the Base unit
via the pass-through connectors. For remote devices, separate power is required at
each expansion unit. Refer to the Power Options section of this manual for more
information on SeaI/O power requirements and power supply sizing.
Included Communications and Expansion Accessories
SeaI/O modules are shipped with the following accessories:
E-Series (Ethernet) Item# CA246 – 1 x 7’ straight through Ethernet cable, for
connection to a hub or switch.
Item# CA251 – 1 x 7’ crossover cable, for direct connection to a
computer’s Ethernet port.
U-Series (USB) Item# CA179 – 6’ A to B USB cable.
M-Series (RS-485)
S-Series (RS-232) Item# KT119 – RS-232 DB9/RJ45 Kit, includes a DB9F to RJ45
No cable is included. RS-485 twisted-pair wiring connects to screw
terminals.
adapter with RS-232 pinout (Item# DB109) and a 7’ CAT5 patch
cable (Item# CA246) for connecting SeaI/O modules to both
Sealevel and standard RS-232 serial ports.
interconnect cable, four metal straps, and four #4-40 metal screws,
for connecting two or more SeaI/O modules together in a “stack”.
Each SeaI/O unit is shipped with 4 adhesive rubber feet that can be
attached to the bottom of the enclosure to enhance stability in table
mount applications.
All SeaI/O modules include the same connectors and configuration options on the
side of the unit:
NOTE:
RS-485 networks should have termination enabled on each end of
the network. Pull-up and pull-down resistors should also be enabled
on the last device on the network.
The 9-30VDC input barrel connector is center positive.
Status LEDs are included on the front of all SeaI/O devices to indicate
Communication (Yellow), Fault (Red), and Status (Green).
410 Series – 16 Optically Isolated Inputs/16 Reed Relay Outputs
SeaI/O-410 modules provide 16 optically isolated inputs and 16 Reed relay outputs.
Inputs can range from 5-24VDC, while the Reed relays provide long life switch
closures that are well suited for low current applications. Inputs and outputs are
grouped into four-bit segments. Each group shares a common for easy wiring via
removable 3.5mm terminal blocks.
Inputs
Type: 16 non-polarized optically isolated inputs
Voltage Range: 5-24VDC
Isolation: 300V
Input Resistance: 6.2K Ohms in series
Response Time: 4 microseconds
420 Series – 16 Optically Isolated Inputs/8 Form C Outputs
The SeaI/O-420 provides 16 optically isolated inputs and 8 SPDT Form C relay
outputs. Inputs can range from 5-24VDC and provide 300V isolation to ground. Each
output offers normally open and normally closed contact connections via 3.5mm field
removable terminal blocks.
Inputs
Type: 16 non-polarized optically isolated inputs
Voltage Range: 5-24VDC
Isolation: 300V
Input Resistance: 6.2K Ohms in series
Response Time: 4 microseconds
Outputs
Type: 8 SPDT Form C relays
Power: DC 30W/ AC 60 VA
Contact Voltage: 60VDC max.
Contact Current: 2A max.
Operate Time: 2ms max.
Bounce Time: 7ms max.
Release Time: 1ms max.
SeaI/O-430 modules provide 32 optically isolated inputs with 300V external isolation
and high channel-to-channel isolation. Ideal for low voltage monitoring applications,
connection to real world signals is made via 3.5mm convenient removable screw
terminal connectors.
Inputs
Type: 32 non-polarized optically isolated inputs
Voltage Range: 5-24VDC
Isolation: 300V
Input Resistance: 6.2K Ohms in series
Response Time: 4 microseconds
440 Series – 32 Reed Relay Outputs
The SeaI/O-440 provides 32 SPST Form A dry contact Reed relays. Reed relays offer
long life performance and fast response time. Convenient removable 3.5mm screw
terminal blocks compatible with 14-22 AWG wiring allow reliable connection to real
world I/O.
Control a variety of low voltage, low current devices with the SeaI/O-450. The
module’s 16 channels of highly reliable SPDT Form C relay outputs are rated for up
to 60VDC @ 2A. Each output offers normally open and normally closed contact
connections via 3.5mm field removable terminal blocks.
Outputs
Type: 16 SPDT Form C relays
Power: DC 30W/ AC 60 VA
Contact Voltage: 60VDC max.
Contact Current: 2A max.
Operate Time: 2ms max.
Bounce Time: 7ms max.
Release Time: 1ms max.
Perfect for driving industry-standard solid-state relay (SSR) racks, the SeaI/O-462
provides 96 bits of buffered drive TTL I/O. Each DB-78 connector brings out 48 I/O
bits addressable as six, eight-bit ports. For easy connection to relay racks, Sealevel
offers a six-foot cable (Item# CA237) that terminates each DB-78 connector to two
industry standard 50-pin IDC connectors. Order part number 462x-KT and receive
two CA237 cables with each unit.
Power Requirements
Max Output Power: +5VDC @ 1A (5W)
Inputs
Logic High: Min 2VDC
Logic Low: Max 0.8VDC
Outputs
Logic High: Min 2VDC @ 32mA
Logic Low: Max 0.5VDC @ 64mA
Depending upon your application, you are likely to find one or more of the following
items useful for interfacing the SeaI/O-462 to real-world signals. All items can be
purchased from our website (http://www.sealevel.com
For high-current, high-voltage applications:
DB-78 to Dual IDC 50 Pin Ribbon Cable (Item Number CA237)
− 60” cable connects each SeaI/O-462’s DB-78 connectors to solid-state
relay racks equipped with 50-pin header interface.
Solid-State Relay Racks:
• Quad six position relay rack (Part Number PB24HQ)
− Relay rack can accept up to six QSSRs for a total of 24 channels.
Features a 50-pin header connector for easy interface via 50conductor ribbon cables.
• Quad four position relay rack (Part Number PB16HQ)
− Relay rack can accept up to four QSSRs for a total of 16 channels.
Features a 50-pin header connector for easy interface via 50conductor ribbon cables.
Quad Solid-State Relay Modules:
• AC Input (Part Number IA5Q) – Provides 4 channels of discrete I/O
interface to monitor AC inputs up to 140V @ 10mA.
• DC Input (Part Number IB5Q) – Provides 4 channels of discrete I/O
interface to monitor DC inputs from 3.3V to 32V.
• AC Output (Part Number OA5Q) – Provides 4 channels of discrete I/O
interface to control AC outputs up to 140V @ 3A.
• DC Output (Part Number OB5Q) – Provides 4 channels of discrete I/O
interface to control DC outputs up to 60V @ 3A.
Simulation/debug module (Part Number TA01)
− Module simulates the operation and load characteristics of a standard 24-
channel relay rack. An LED corresponding to each port bit illuminates to
indicate state. Eight position DIP-switches are used to generate input status
changes.
The SeaI/O-463 offers 96 bits of buffered drive TTL I/O via four internal industrystandard 50-pin header connectors. The interface module addresses the 96 channels
of I/O as 12 eight-bit ports, each programmable as input or output. Using standard
50-pin IDC ribbon cables, connect up to four industry standard relay racks for PC
based control and automation of equipment including sensors, switches, security
control systems, and other industrial automation systems. A metal strain relief
bracket is included to secure the cables after installation.
Power Requirements
Max Output Power: +5VDC @ 1A (5W)
Inputs
Logic High: Min 2VDC
Logic Low: Max 0.8VDC
Outputs
Logic High: Min 2VDC @ 32mA
Logic Low: Max 0.5VDC @ 64mA
Depending upon your application, you are likely to find one or more of the following
items useful for interfacing the SeaI/O-463 to real-world signals. All items can be
purchased from our website (http://www.sealevel.com
For TTL applications:
Terminal Block Kit - (Item# KT107)
− Kit includes the TB07 screw terminal block and CA167 ribbon cable for
connecting one of the SeaI/O-463’s 50-pin header connectors to your I/O.
6” Snap track and DIN rail clips are included for DIN rail mounting.
− Interfaces each of the SeaI/O-463’s 50-pin header connectors.
Simulation/debug module (Item# TA01)
− Module allows monitoring status of output pins and controlling state of
input pins. An LED corresponding to each port bit illuminates to indicate
state. Eight position DIP-switches are used to generate input status
changes.
− 40” cable connects the SeaI/O-463 to solid-state relay racks equipped with
50-pin header interface.
IDC 50 to IDC 50 Pin Ribbon Cable (Item# CA135)
− 40” cable connects the SeaI/O-463 to solid-state relay racks equipped with
50-pin edge connector.
Solid-State Relay Racks:
• Quad six position relay rack (Item# PB24HQ)
− Relay rack can accept up to six QSSRs for a total of 24 channels.
Features a 50-pin header connector for easy interface via 50conductor ribbon cables.
• Quad four position relay rack (Item# PB16HQ)
− Relay rack can accept up to four QSSRs for a total of 16 channels.
Features a 50-pin header connector for easy interface via 50conductor ribbon cables.
Quad Solid-State Relay Modules:
• AC Input (Item# IA5Q) – Provides 4 channels of discrete I/O interface to
monitor AC inputs up to 140V @ 10mA.
• DC Input (Item# IB5Q) – Provides 4 channels of discrete I/O interface to
monitor DC inputs from 3.3V to 32V.
• AC Output (Item# OA5Q) – Provides 4 channels of discrete I/O interface to
control AC outputs up to 140V @ 3A.
• DC Output (Item# OB5Q) – Provides 4 channels of discrete I/O interface to
control DC outputs up to 60V @ 3A.
Simulation/debug module (Item# TA01)
− Module simulates the operation and load characteristics of a standard 24-
channel relay rack. An LED corresponding to each port bit illuminates to
indicate state. Eight position DIP-switches are used to generate input status
changes.
Designed using the Maxim MAX197 successive approximation-type A/D chip, the
SeaI/O-470 provides eight differential or 16 single-ended 12-bit inputs. The A/D
inputs can be individually configured for sensing 4-20mA current loop signals.
Additionally, the module provides two 12-bit D/A output channels, eight optically
isolated inputs, and eight open collector outputs, ideal for driving 24V devices
commonly found in industrial environments. Perfect for a variety of data
acquisition/control and test & measurement applications, the SeaI/O-470 includes
removable screw terminals, which simplify field-wiring connections.
520 Series – 8 Optically Isolated Inputs/8 High-Current Form C Outputs
The SeaI/O-520 provides 8 optically isolated inputs and 8 SPDT high-current Form C
relay outputs. Inputs can range from 5-30VDC and provide 300V isolation to ground.
Each output offers normally open and normally closed contact connections via
3.5mm field removable terminal blocks.
Inputs
Type: 8 non-polarized optically isolated inputs
Voltage Range: 5-30VDC
Isolation: 300V
Input Resistance: 6.2K Ohms in series
Response Time: 4 microseconds
Base modules are powered from a 9-30VDC source using either the DC jack or screw
terminals on the side of the unit. Sealevel offers several power supply choices to
make connection easy (see Accessories chapter at the end of this document).
SeaI/O Expansion Power Connection
Each SeaI/O product, including the expansion modules, contains an onboard
switching regulator power supply rated for 9-30VDC. For local installations (less
than 10’ apart), expansion unit power is usually supplied from the Base unit via the
pass-through connectors. The number of expansion modules that can be driven from
the Base unit depends on the power source and number/type of expansion units.
Refer to the chart below for power requirements. For expansion modules mounted
remotely (greater than 10’ apart), separate power is required at each expansion unit.
The SeaI/O-462 and SeaI/O-463 use 74ABT245 octal bi-directional transceivers to
provide TTL input/output capabilities and can sink 64mA and source 32mA. Each
bit is pulled to +5V through a 10K ohm pull-up resistor to insure each bit is at a
known state when not driven. The supply current and maximum output power are
shown below.
A typical application for SeaI/O products would use one Base module and several Nseries units in a local expansion configuration. In this arrangement, with power
applied to the Base module through either the DC jack or screw terminal connector
and passed-through to the expansion units, attention should be given to ensure the
input power to the Base module is adequate.
Example: Power (W)
Base Unit: SeaI/O-430U 0.7
Expansion 1: SeaI/O-410N 1.4
Expansion 2: SeaI/O-440N 2.5
4.6W Power Required
In this application, the Sealevel Item# TR112 “wall wart” power supply is a good
choice since it is low-cost and supplies 24VDC @ 250mA (6W).
NOTE:
A complete listing of recommended power supplies is provided in
the Accessories section of this manual.
The SeaI/O-463 and SeaI/O-470 are the only two modules that require you to open
the enclosure. On all SeaI/O modules, most device settings can be configured on the
left side of the SeaI/O module. Refer to the SeaI/O Hardware Description section
of this manual for a list of common features available and settings that can be
changed on the left side of the SeaI/O module.
When connecting more than one SeaI/O module to a host computer, you will need to
set the device address (Slave ID). This can be done in software or by using a rotary
switch on the left side of the enclosure. Refer to the SeaMAX Application Suite
section where you can find instructions for configuring the device address (Slave ID)
and setting the termination pull up and pull down resistors.
SeaI/O-463 Ribbon Cable Installation Instructions
A copy of these instructions are included with the SeaI/O-463 module and can also
be downloaded from the SeaI/O-463 product page on the Sealevel website.
NOTE:
Do not perform these instructions with the power connected. Be
sure to follow proper ESD procedures by grounding yourself and the
SeaI/O module.
What you will need:
SeaI/O-463 module
Phillips head screwdriver
Slotted screwdriver
50-pin IDC ribbon cable* (up to four)
On the front right side of the module, wedge a
slotted screwdriver between the top and bottom
halves as shown. Pry upwards – a pem in the top
half must clear the metal lip in the bottom half of
the enclosure.
Step 3
Remove the two screws from the metal strain
relief, as shown.
Step 4
Remove the three screws from the bottom of the
module and remove the front plate.
Step 5
Install up to four industry standard ribbon cables
in the 50-pin header connectors. A list of optional
cable part numbers is listed on the previous page.
Step 6
Replace the front plate and install the three screws
in the bottom of the module as shown.
Replace the metal strain relief. Start both screws
and tighten only until snug. Do not over-tighten.
Step 8
Replace the top half by starting it on the left side
over the connectors and then snapping the right
side down into place. Be careful not to pinch
fingers. Replace both screws on each side and
then replace the terminal block on the left side.
Step 9
Continue with the installation of the SeaI/O-463
module. The SeaI/O Hardware Description
section of this manual contains information on
TTL applications and optional accessories. The
SeaMAX Application Suite section walks you
through setting up the hardware address (Slave ID)
and software installation.
SeaI/O-470 Jumper and Dipswitch Settings Instructions
The SeaI/O-470 module ships factory configured with the D/A outputs set for 0-10V
and current loop mode on the A/D inputs disabled. If you need to enable current loop
mode or set the D/A outputs to 0-5V, you will need to open the enclosure and access
the jumpers (shown on the next page).
NOTE:
Do not perform these instructions with the power connected. Be
sure to follow proper ESD procedures by grounding yourself and the
SeaI/O module.
What you will need:
SeaI/O-470 module
Phillips head screwdriver
Slotted screwdriver
Step 1
Remove the terminal block from the left side and
then remove the two black screws from each side
of the module as shown in the image.
Step 2
On the front right side of the module, wedge a
slotted screwdriver between the top and bottom
halves as shown. Pry upwards – a pem in the top
half must clear the metal lip in the bottom half of
the enclosure.
Jumpers and dipswitch locations are shown on the
following page.
This detail image of the right side of the SeaI/O-470 circuit board shows the locations
of the user configurable jumpers and dipswitches. Refer to the following pages for
instructions on properly configuring the jumpers and switches. The colored boxes
are shown here for clarity and are not visible on the actual circuit board.
The (E1) and (E2) jumpers (shown in the orange boxes on the previous page)
configure the D/A outputs for 0-5V or 0-10V. Both channels can be configured
independently. The D/A outputs do not support negative voltages. You must also set
the correct output voltage in your application or MaxSSD. Refer to the SeaMAX Application Suite section of this manual for help configuring software to work with
the SeaI/O-470.
A/D 10X Gain
The A/D 10X gain (E3) jumper (shown in the green box on the previous page) is
disabled at the factory. Position the hardware jumper on both pins to enable this
functionality, which allows smaller voltages to be measured more accurately (e.g., a
0-1V input signal can be measured more accurately by enabling the 10x hardware
gain jumper and setting the SeaI/O-470 A/D input channel for 0-10V range). You
can also set the A/D input channel for 0-5V to sense voltages smaller than 0.5V.
When the jumper is enabled, the “10X Hardware Gain” checkbox will also be
enabled on the A/D Inputs tab in MaxSSD. Refer to the SeaMAX Application Suite
section of this manual for information on using MaxSSD.
A/D and Current Loop Dipswitches
The (SW3) and (SW4) dipswitches (shown in the yellow box on the previous page)
configure the A/D inputs for current loop mode and are disabled at the factory. Since
current loop mode is differential, the corresponding dipswitch on both (SW3) and
(SW4) should be properly set (e.g., ‘CH1’ on both dipswitches needs to be set to
‘ON’ to enable current loop mode).
All SeaI/O modules include two RS-485 pass-through connectors on the left side of
the unit that are internally connected to the same pins on the screw terminals. This
offers two convenient options for adding additional expansion modules.
For connecting several SeaI/O modules together in a “stack”, all N-series expansion
modules ship with an expansion and strap kit (item# KT122) that includes four metal
straps, four #4-40 screws, and a 5” RJ45 RS-485 interconnect cable (item# CA239).
The metal straps allow you to securely connect multiple SeaI/O modules together.
The interconnect cable can be used to connect SeaI/O modules together via the RJ45
pass-through connectors, providing an easy method to cascade RS-485 signals and
power from one module to the next.
For expansion modules that are less than ten feet from a base unit, a standard RJ45
CAT5 patch cable may be used. For SeaI/O modules greater than ten feet apart, use
twisted-pair cable connecting the data lines to the screw terminals instead. If RJ45
connectors are preferred, be sure to connect only the data lines (pins 4 & 5).
NOTE:
Modules greater than ten feet apart must have separate power
supplies. Refer to the Power Options section of this manual for
recommendations.
I/O Wiring – SeaI/O-410, 420, 430, 440, and 450 Modules
Optically isolated inputs are arranged such that each group of four shares a single
common. The four I/O points and shared common are connected via a five-position
removable screw terminal. Input voltage range is 5-24VDC. Like the inputs, each
group of four Reed relays also shares a single common and connects via a fiveposition removable screw terminal. Form C Relay outputs are arranged such that each
group of two relays shares a common. The NC and NO contacts of each relay along
with the common are brought out via a five-position removable screw terminal.
The SeaI/O-462’s 96 digital I/O channels are brought out to two DB-78 Female
connectors on the front of the enclosure (pinout shown below). Each connector
provides 48 bits of digital I/O divided into six eight-bit ports. Each port may be
individually configured via software command as an input or an output.
For easy connection to industry-standard solid-state relay racks, Sealevel
manufactures a 6’ cable, Item# CA237, that terminates the DB-78 to two industry
standard 50-pin header connectors. Two cables and a SeaI/O unit can be order
together as a kit using Item# 462x-KT. The pinout for the two 50-pin headers is
shown below.