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GRM/M21.230.0.1 Master Control Module User Manual

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This document is the user manual and technical specification for the ABB BFreLax GRM/M21.230.0.1 master control module, which manages room expansion modules and server communication via TCP/IP and RS-485. It details installation, wiring, DIP switch configuration, LED output control (including SOS), binary input/output channels, and technical parameters for the device.

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