A terminal block includes: a first split body that includes one or more terminal connection parts and a first coupling portion; a second split body that includes one or more terminal connection parts and a second coupling portion coupled to the first coupling portion; and a coupling member that couples the first coupling portion to the second coupling portion and fixes the first split body and the second split body to a mount to which the terminal block is mounted.

A contact module includes a leadframe having signal contacts arranged in pairs. Each signal contact includes a lead having sides extending between inner and outer edges. The contact module includes a dielectric frame supporting the leadframe having a first side and a second side with windows extending through the dielectric frame between the first side and the second side. The windows exposing to air the sides, the inner edges and the outer edges of the corresponding leads along a majority of lengths of the leads. The contact module includes a shield structure having a first ground shield at the first side and a second ground shield at the second side to provide electrical shielding for the signal contacts.

A modular electrical bus system for a valve manifold has a main communication module with a plurality of modular I/O units each having a plurality of I/O fittings being both electrically and mechanically connectable together via a bridge member connecting adjacent units and the main communication module. At least one of the modular I/O units is also mechanically separable from and maintains communication connection to the main communication module. One or both of the modular .[.IO.]. .Iadd.I/O .Iaddend.units and main communication module may have an alpha-numeric display.

A terminal block for use with a railroad terminal board may include a terminal block body comprising first and second sides, a plurality of first connection posts extending from the first side of the body, and a second connection post extending from the second side of the body. The second connection post may be connected to one of the plurality of first connection posts. The second connection post may be configured to mount the terminal block to the railroad terminal board. The terminal block body may include a single hole extending through the first and second sides and configured to accept a mounting screw for mounting the terminal block to the railroad terminal board.

A connection module for mounting on a busbar module or several busbar modules extending in a longitudinal direction includes: a housing, a rear side of which is mounted or mountable on the busbar module or busbar modules; a crossbar, movable on a first longitudinal side of the rear side of the housing transversely to the longitudinal direction, so as to provide a positive-locking connection of the connection module to the busbar module or the busbar modules in a mounted position of the connection module; and a latching profile on a second longitudinal side, opposite the first longitudinal side, of the rear side of the housing, the latching profile providing a positive-locking connection of the connection module to the busbar module or the busbar modules in the mounted position.

An I/O device includes an I/O base, at least two I/O modules supported on the I/O base, and a duplex terminal block assembly supported on the I/O base. The at least two I/O modules include a first I/O module and a second I/O module coupled to the duplex terminal block assembly in parallel. The duplex terminal block assembly can include connectors for connecting to a field device. The duplex terminal block assembly can include conductive structures for coupling the connectors with each of the first and second I/O modules. The duplex terminal block can be installed in a pair of ports in an I/O base to connect two I/O modules in parallel.

A connector (100) includes a body (101) and a plurality of ports (102,103,104) extending distally from a front major face (301) of the body. The body defines a connector bay (320) configured to couple to any of a single-tube, intermittent, deep vein thrombosis therapy male connector (901), a double-tube, intermittent, deep vein thrombosis therapy male connector (902), or a three-tube, sequential, deep vein thrombosis therapy male connector (903).

An I/O device includes an I/O base, at least two I/O modules supported on the I/O base, and a duplex terminal block assembly supported on the I/O base. The at least two I/O modules include a first I/O module and a second I/O module coupled to the duplex terminal block assembly in parallel. The duplex terminal block assembly can include connectors for connecting to a field device. The duplex terminal block assembly can include conductive structures for coupling the connectors with each of the first and second I/O modules. The duplex terminal block can be installed in a pair of ports in an I/O base to connect two I/O modules in parallel.

A connector is provided that includes a plurality of wafers. Each wafer supports a terminal and adjacent signal wafers are configured so as to provide broad-side coupled terminals. A pair of signal terminals can be surrounded on both sides by ground wafers that offer shielding so as to help isolate one signal pair from another signal pair. The geometry of the wafers can be adjusted so as to provide a tuned transmission channel. The resultant tuned transmission channel can be configured to provide desirable performance at high signaling frequencies of 12-16 GHz or even higher signaling frequencies such as 20 GHz.