MAC MAC155L - Local Alarm Contacts; Rs485 Communications

To Next Page

To Previous Page

Pg 21

LOCAL ALARM CONTACTS

A solid state relay will to provide a contact closure during an alarm event.

Reliability is maintained with the use of a solid state relay since there are no

moving parts or contacts to pit which guarantee a reliable circuit path in the

event of an alarm condition. Keeping in mind the solid state nature of this alarm

the polarity of the controlled circuit must match the output of the solid state relay

contacts.

RS485 COMMUNICATIONS

The RS-485 port is provided on the rear of the controller to implement

communications to external devices. The external devices must be capable

of Modbus RTU communication, and the Modbus Communication option

must be purchased. The RS485 port can also communicate with the optional

MAC155 PLC Interface. Implementation of this option will allow remote I/O

signals for a PLC. Further information about the MAC155 PLC interface can

be found in the controller options section. The Modbus Communications

option is not necessary for the PLC interface option to work.