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Used With A Mixture of CM 2000 and CM 2000+ Control Modules:
The AC 2000+ can interface with both CM 2000 and CM 2000+ control modules simultaneously.
However, a maximum of 40 control modules may only be used with a single AC 2000+ and a
data rate of 300 baud must be used.
7.3.2 RELAY DRIVER OUTPUTS
The AC 2000+ is equipped with two relay driver outputs. One is for indicating “Alarm”
conditions, and the other for indicating “Warning” conditions. These relay driver outputs
(+12 VDC @ 100 mA max.) are intended to drive external 12Vdc coil relays connected to local
annunciators. They operate in a “fail-safe” mode, meaning that they are normally energized
when the AC 2000+ is powered up and there are no active alarm or warning conditions.
Both outputs have an LED on the front panel of the AC 2000+ to indicate their status.
See Appendix B7 for typical electrical connections.
7.3.3 LOCAL/REMOTE COMMUNICATION PORTS
The AC 2000+ is equipped with three communication ports to interface with external
programming devices supporting the ModBus protocol (such as a PC, PLC or DCS).
All RAYCHEM T2000 HTC parameters and data may be accessed through any of these three
communication ports, using either Page or Linear Modbus Mapping.
Complete documentation for the serial communications interface to the AC 2000+ is described
in the Group Communications Controller: Modbus Protocol Interface – Page Mapping and
in the Group Communications Controller: Modbus Protocol Interface – Linear Mapping
documents which may be ordered from your nearest nVent sales office.
The following descriptions give details of each of these three communication ports:
Remote Port:
The remote port’s RS-485 interface allows several AC 2000+ devices to be multi-dropped onto
the same pair of communication wires and then connected to a remote programming device
such as a host computer, PLC or DCS. This is an isolated, 2-wire, RS-485 serial port that may be
connected on the back panel of both the CR 2000 and CR 2000+ card racks.
Both the ASCII and RTU modes of the ModBus communications protocol are supported to a
maximum data rate of 9600 baud.
TRANSMIT and RECEIVE status LEDs are located on the front panel of the AC 2000+ to
indicate communication activity on this port.
IMPORTANT: The AC 2000+ may only be configured to use either the Remote Port or the
Ethernet Port at any one time.
Local Port:
This port can be configured to use one of two serial interface types. Either a non-isolated,
2-wire, RS-485 serial interface located on the back panel of the CR 2000+ card rack, or an
RS-232 serial interface located on the front panel of the AC 2000+. Only one of these two
interfaces may be used at any one time. The RS-232 interface may be used to connect
with one Personal Computer, PLC or DCS in close proximity to the AC 2000+. The RS-485
interface allows several AC 2000+ devices to be multi-dropped onto the same pair of RS-485
communication wires and connected to an external RS485, ModBus master device.
Both the ASCII and RTU modes of the Modbus communications protocol are supported to a
maximum data rate of 9600 baud.
TRANSMIT and RECEIVE status LEDs are located on the front panel of the AC 2000+ to
indicate communication activity on this port.
Ethernet Port:
When remote access to RAYCHEM T2000 HTC parameters and data is required using an
Ethernet Local Area Network (LAN) this port is used. The Ethernet Port is located on the back
panel of the CR 2000+ card rack and provides an industry-standard 10Base-T interface.
The software communications protocol supported by the Ethernet Port is Modbus/TCP.
LINKandACTIVITYstatusLEDsarelocatedonthefrontpaneloftheAC2000+toindicate
communication activity on this port.
IMPORTANT: The AC 2000+ can only be configured to use either the serial Remote Port or the
Ethernet Port at any one time.
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