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1.2.4 AC 2000+ ALARM/COMMUNICATIONS INTERFACE CARD
The AC 2000+ is an enhanced version of the original AC 2000 alarm/communications interface
card. It includes a microprocessor that provides the user with many more features than the
original AC 2000. Firmware versions may range from V1.00 and up. The AC 2000+ is designed
to provide communications interfacing (using isolated 2-wire RS-485, RS-232, or 10Base-T
Ethernet) between the control modules and an external programming device that supports the
Modbus
®
protocol (see Section 1.3). Each communications port on the AC 2000+ has its own
RX and TX LEDs to indicate communication activity.
The AC 2000+ includes “alarm” and “warning” relay driver outputs to drive external relays
connected to local annunciators. Each output has its own LED on the front panel,
to indicate its status. The AC 2000+ must only be inserted into the left-most slot of any of
the four types of card racks. However, the alarm and warning relay driver outputs,
and some of the communication ports are not available when using the CR 2000 or
the CR 2000-CPS card racks.
See Appendices B5 to B10 for details on wiring to an AC 2000+ alarm/communications
interface card.
1.2.5 CR 2000 CARD RACK
The CR 2000 card rack was the original card rack designed for use with the RAYCHEM T2000
system. It provided each control module its own isolated power supply connection.
Two versions of this card rack have been manufactured. The first version did not support the
ATC (Ambient Temperature Control) signal connection between the ten control modules, and
the second (Rev A) version did support the ATC signal. The CR 2000 card rack is designed to
provide mechanical protection and wiring terminals for one alarm/communications interface
card and up to ten control modules. The card rack also provides wiring terminals allowing the
inter-connection of up to another three card racks.
The following are the signal connections provided by the card rack for each of the ten control
modules:
• Two RTD inputs
• One ground fault current transformer input
• One load current transformer input
• One output to control either an SSR or contactor
• Power supply input
The following are the common signal connections provided by the card rack for each of the ten
control modules:
• Communications connections with the alarm/communications interface card
• Control module alarm status signal
• ATC signal interconnection with each of the ten control modules
The following are the signal connections provided by the CR 2000 card rack for the alarm/
communications interface card:
• A 2-wire communications connection (RS-485 or modem) for a remote programming device
• Power supply input
• One normally open dry contact relay output for a remote alarm indicator
• One normally closed dry contact relay output for a remote alarm indicator
See Appendix B8 and Appendix B9 for wiring details for a CR 2000 card rack.
1.2.6 CR 2000+ CARD RACK
The CR 2000+ card rack is similar to the original CR 2000 Rev A card rack (see Section 1.2.5),
except that it has been modified to support the additional features of the AC 2000+ alarm/
communications interface card.
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