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RS-485, also known as TIA-485(-A) or EIA-485, is a standard, originally introduced in 1983, defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced , and multipoint systems are supported.
The serial DCD pin can be used to accurately detect a PPS signal, as described in RFC 2783: [1] One convenient means to provide a PPS signal to a computer system is to connect that signal to a modem-control pin on a serial-line interface to the computer. The Data Carrier Detect (DCD) pin is frequently used for this purpose.
The number gives their outer screw thread diameter in millimeters as with the identically named screws. However, the connectors are further classified by a so-called coding, denoted by one or more letters, which defines things like pin layout, shape of connecting surfaces and electrical properties. [2] [3]
Universal EXTension (UEXT) is a connector layout which includes power and three serial buses: Asynchronous, I 2 C, and SPI separately over 10 pins in a 2×5 layout. The connector layout was specified by Olimex Ltd and declared an open-project that is royalty-free in 2011, and was used in all their boards after 2004.
Jack (least-movable connector of a connector pair), jack connector (connector may have "male" pin contacts and/or "female" socket contacts) all types of connectors, including pin headers. JP: Jumper (link) K: Relay or contactor: L: Inductor or coil or ferrite bead: LD, LED: LED: often changed to "D" for diode LS, SPK: Loudspeaker or buzzer: M ...
The height of the plug's insertion area is 0.260 inches (6.60 mm) and the contacts are 0.040 inches (1.02 mm) apart (contact pitch), so the width is dependent on the number of pin positions. [ 7 ] [ 8 ] However, not all plugs from all manufacturers have this capability, and some jack manufacturers warn that their jacks are not designed to ...
The hardware utilized are RS-485 transceivers wired for open collector operation through the use of a pullup and pulldown of the separate data lines. Transmission is accomplished by controlling the driver enable pin of the transceiver. This method allows multiple devices to share the bus without the need for a single master node.
TIA-530 originally used Category I circuits for what is commonly called "Data Set Ready" (DCE Ready, pins 6 and 22) and "Data Terminal Ready" (DTE Ready, pins 20 and 23). Revision A [2] changed these interchange circuits to Category II (para 4.3.6 and 4.3.7 of the standard [3]) and added a "Ring Indicator" on pin 22. Pin 23 is grounded in TIA ...