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How do I configure the AT Communications Module control board?
For simple applications, the Communications pc board (A12) can be configured using
DIP switches. The DIP switches set the Protocol, media type (RS-232, RS-485, or Ethernet),
serial speed (baud rate), Modbus protocol type (ASCCI or RTU), and the Modbus slave
address. For the more advanced configuration parameters used for the DNP3 protocol and
Ethernet, a computer is required to configure the parameters. For further details, refer to
Factory Defaults Section 4.3 on page 16.
Can the AT Communications Module be added to an old charger in the field?
Yes. The communications option can be added to a charger in the field.
How do I know if AT Communications is compatible with my charger?
AT Series chargers manufactured before January 1, 2003 will require the Main
Control PC Board (A1) to be replaced or reprogrammed to add the update software to
support the communications option. Chargers that have the older EN0024-00 Main Control
PC Board (A1) will need a replacement. Chargers that have an EN5002-00 Rev. 0, 1, or 2
Main Control PC Board (A1) will also need replacement. Chargers that have an EN5002-00
Rev. 3 or higher but do not have software Rev. 3.00 or higher need to be reprogrammed.
Chargers that have an EN5002-00 Rev. 3A or higher and have software Rev. 3.00 or higher
already support the AT Series Communications Module option.
How do you connect to the AT Communications Module?
The AT Communication Module supports a serial connection using RS-232, RS-485,
or Ethernet (requires RJ45 socket option). RS-232 is a standard serial connection used on
computer systems and is limited to a maximum cable length of 50ft/15.4m. For industrial
serial applications RS-485 is recommended. RS-485 is designed to be immune to electrically
noisy environments and can have up to a maximum cable length of 4,000ft/1.2km. The
Ethernet interface is optional, and will support standard 10/100 copper networks.
What wiring variation of RS-485 is supported?
Two (2) wire, half-duplex
Can I communicate to more than one (1) AT Series charger?
Yes, both Ethernet and RS-485 communications allows multiple chargers to be
connected to the same network. Up to thirty-two (32) AT Series chargers can be connected
together via RS-485. Each charger will be assigned an address so that the system knows
which charger it is communicating with. The Ethernet interface supports standard Ethernet
addressing via IP address, netmask and gateway configuration. RS-232 does not support
multiple chargers on a serial network.
What speed does the AT Communications Module support?
The AT Communications Modules supports BAUD rates of 9600 and 19,200 for RS-
232 or RS-485 and 10/100 Mb/s for Ethernet.
What language (protocol) does the AT Communications Module use?
The AT Comm Module utilizes two (2) protocols (languages): Modbus and DNP3
APPENDIX A
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