MECrf for Access to KNX RF Bus Devices

The basic functionality of the media coupling device MECrf is coupling a KNX TP main line with a KNX RF sub line. Main task of the MECrf is filtering the traffic according to the installation place in the hierarchy (individually addressed telegrams, in this document named Physical telegrams) or according to the built in filter tables for group oriented communication (Group telegrams). Filtering of messages can be enabled or disabled. With the MECrf it is possible to address every bus device in the bus system. For RF devices the MECrf can be used as the programming interface via TP. Programming on the TP side from RF side can be suppressed. Number of repetitions can be reduced. Device oriented messages can be suppressed. The MECrf has no KNX communication objects for itself, supports long messages (up to 201 byte APDU length) and features a configurable "Manual function" (e.g. transmit all group telegrams) that can be activated by a single button press. In addition, the device switches on filter tables after time out automatically. Another feature to increase the data trough put is the ability to send an immediate acknowledged (IACK on TP side) on an own frame. The MECrf conforms to KNX-AN161 with all options (Filtering, Raw mode) and offers a detailed internal diagnosis by displaying all operational states with six LEDs. The LEDs show the device states like bus state, bus traffic, errors/faulty messages, busy on the bus, state of the filter table, etc

Specifications and Special Features:

• Data connection between KNX-TP-main line and KNX-RF-sub line
• Access to every bus device in the KNX bus system
• Support of long telegrams (APDU: max. 201 bytes)
• Filtering the traffic according to the installation place in the hierarchy or according to the built in filter tables for group-oriented communication
• Filtering of group messages and unnecessary device-oriented messages; full filter table available
• Configurable IACK sending on TP telegrams for data throughput increase
• Reduction of re-transmissions
• Ability to suppress device configurations from RF side to TP side with simultaneously ensuring transparent full access from TP side to RF side
• Configurable one-button activation of special functions
• Available special function: "pass all telegrams"
• Bus status (traffic, errors, routing) on each side are accurately shown by six duo LEDs
• Communication problems due to high bus loads or retransmissions between both lines are indicated
• Conform to KNX-AN168 in all options
• Support of Raw Frames, a special diagnostic mode
• Can be used with ETS5 and higher