Moxa Technologies CN2600 Series User Manual

CN2600 Series Serial Port Operation Modes
4-5
Dual-host Redundant Data Acquisition System
(DRDAS)
The DRDAS operation mode provides a highly redundant network structure that takes advantage of the
CN2600’s dual LAN ports, dual IP addresses, and dual MAC addresses. DRDAS uses a backup PC that is set up
to take over when the primary PC fails.
The CN2600’s dual-host redundant configuration sends serial data to 4 IP addresses on the network. Users
select a Primary IP and 3 Secondary IPs. When the Primary IP fails, the backup IPs take over by using the
DRDAS library.
The DRDAS library is used to configure the DRDAS of the CN series. You must use the DRDAS library to
designate the primary and secondary hosts. If you need this library, please contact conn.support@moxa.com
With this kind of redundant setup, if one of the secondary IPs tries to send commands to the serial device, the
commands are discarded by the CN2600, since only the Primary IP is allowed to conduct bi-directional
transmission. The backup IPs are only allowed to receive data from the CN2600.
NOTE
The RS
-232 connector on the Remote Terminal Unit (RTU) shown above must be set up with an RS-232 to
RS
-422/485 converter, such as the Moxa TCC-100I, to convert RS-232 signals to RS-485 signals. The
connectors on the two CN2600 terminal servers will also need to use converters, such as the Moxa TCC
-
100I.
In this way, users
can take advantage of RS-485’s multi-drop feature to share data with the secondary
CN2600.

Moxa Technologies CN2600 Series Specifications

General

Brand	Moxa Technologies
Model	CN2600 Series
Category	Server
Language	English