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Features Key features include:  Combination foot that supports 32 or 35 mm DIN rail mounting  Distinct family group color  Three-tier termination for RS-422 and RS-485 and four DB-25 cable connectors for RS-232 communication interfaces  Switches to select transmit and receive signals and other RS-232 communication signals  Switch-selectable termination resistors for RS-422 and RS-485 communication. Overview Field I/O signals connect to the FBM subsystem via DIN rail mounted termination assemblies (TAs). Each FBM224 termination assembly (see Figure 1) and its associated termination cable provide connection compliance to the electrical interface standards (RS-232, RS-422 or RS-485) between the field devices and the FBM224 Modbus Communication Interface Module. The TA has four DB-25 cable connectors for RS-232 communication interface and switches to match the RS-232 signal pinout of the DB-25 connectors to various slave devices. The TA has a three-tier compression type or ring lug connection for RS-422 and RS-485 communication interfaces. Switch-selectable termination resistors are built into the TA for active termination when used with RS-422 and RS-485 communication interfaces. TAs are available in Polyamide (PA) material. The DIN rail mounted TAs connect Modular Baseplate by means of a removable termination cable. The cable is available in a variety of lengths, up to 5 meters (16 feet), allowing the TA to be mounted in either the enclosure or in an adjacent enclosure. FUNCTIONAL SPECIFICATIONS Modbus Communications INTERFACE Four serial I/O communication ports provide interface to up to four Modbus buses (RS-232, RS-422 and/or RS-485). Ports 1 and 2, and/or Ports 3 and 4 can be user-configured to function as a single logical port with redundant cables to dual ported devices. BUS CHARACTERISTICS General Electronic Industrial Association (EIA) RS232, RS-422 or RS-485 communications selectable on a per port basis. The RS-485 physical communication medium consists of twisted-pair shielded copper cable containing a single conductor pair. The RS-422 is a 4-wire physical communication medium. The RS-232 physical communication medium is a DB-25 cable to a customer supplied device. EIA RS-232, RS-422 and RS-485 I/O Communication Type Asynchronous communication, direct connect link (RS-232) Transmission Rate 300, 600, 1200, 2400, 4800, 9600, 19,200, 38,400, 57,600 and 115,200 baud Protocol Modbus protocol in RTU mode. 8-bit characters; odd, even or no parity,1 or 2 stop bits. I/O CAPACITY Up to 64 devices per FBM224 maximum (number of actual devices is performance dependent) with up to 2000 DCI point connections.