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Description of Assembly
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The CNA1000 assembly is designed to serve as a communications
protocol converter between legacy serial communications enabled
equipment and modern IP packet data transport networks. The
CNA1000 is ideally suited for applications such as:
- Interfacing legacy custom and industry standard protocols
to an IP LAN/WAN infrastructure
- Protocol conversion between disparate field code networks
and systems
- IP access to remote control and monitoring equipment for
remote maintenance and diagnostics
- IP access to remote field equipment data acquisition and
event alarming
- Communications and Message Gateway for the rail industry I
Interoperable Transport Protocol
The CNA1000 assembly consists of a CPU module with a supporting
communications interface board mounted in a rugged metal
enclosure. The assembly can be shelf mounted or snapped onto a
DIN rail. The DIN rail mounting system makes it easy to install at
typical field code system locations. In support of the protocol
conversion functionality, the CNA1000 provides three each RS232
serial asynchronous communications ports, two RS232 synchronous
ports, an Ethernet 10/100 auto-sensing LAN port and two each
optically isolated INPUTS and OUTPUTS. The internal DC power
supply is electrically isolated to support direct operation from signaling
system battery banks.
The 10/100 Ethernet port supports communications across public or
private networks providing connectivity from the central office to the
remote field code unit, or between like locations. The IP address for
the CNA1000 may be hard-coded by the user or it can be configured
to search for a remote DHCP server. If configured to use DHCP, on
start up, the device searches for a DHCP server. If a DHCP server is
available, the device automatically obtains its IP address information
from the DHCP server. If no DHCP server is found, the device shall
revert to the internal default IP addresses.
Description of Assembly
Key features of the CNA1000 include:
Five high-speed serial communications ports
10/100 auto-sensing Ethernet LAN/WAN support
Software selectable multi-protocol serial transceivers
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
Support for legacy serial communications protocols such as
Genisys, MCS1, HP-1, HDP, Datatrain
HDLC communications protocol for industry standard interfaces
such as ATCS / ARES / GTC
I/O support for DC code line protocols such as US&S 504/506/ 514
Input supply DC isolation
The front panel connections as shown in Figure-1 provide easy
access to communications interfaces on the CNA1000 whether it is
shelf or DIN rail mounted. Three RJ45 jacks are provided for the
serial asynchronous communications, two female DB25 connectors
are provided for RS232 synchronous communications and two each
four-pin plug in connectors are provided for the optically isolated I/O.
Figure-1: Front Panel of the CNA1000
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