• Serial Port Stopbits
• Serial Port Switch
• Com Port Slot

The specification also says nothing about a parallel port (Lpt1). Do you have an expansion card into which you plugging in the printer. The socket would not be in the main group of connectors but separate and in the vertical slots. Some port expansion cards had both Serial and parallel ports so this might be the missing driver. Amazon.in: Buy Serial Port Cards online at low prices in India at Amazon.in. Shop Serial Port Cards from popular brands such as Lsi and more for best prices at Amazon.in.

In telecommunication and data transmission, serial communication is the process of sending data one bit at a time, sequentially, over a communication channel or computer bus. This is in contrast to parallel communication, where several bits are sent as a whole, on a link with several parallel channels.

Serial communication is used for all long-haul communication and most computer networks, where the cost of cable and synchronization difficulties make parallel communication impractical. Serial computer buses are becoming more common even at shorter distances, as improved signal integrity and transmission speeds in newer serial technologies have begun to outweigh the parallel bus's advantage of simplicity (no need for serializer and deserializer, or SerDes) and to outstrip its disadvantages (clock skew, interconnect density). The migration from PCI to PCI Express is an example.

Cables[edit]

Serial Port Stopbits

Many serial communication systems were originally designed to transfer data over relatively large distances through some sort of data cable.

Practically all long-distance communication transmits data one bit at a time, rather than in parallel, because it reduces the cost of the cable. The cables that carry this data (other than 'the' serial cable) and the computer ports they plug into are usually referred to with a more specific name, to reduce confusion.

Keyboard and mouse cables and ports are almost invariably serial—such as PS/2 port, Apple Desktop Bus and USB.

The cables that carry digital video are almost invariably serial—such as coax cable plugged into a HD-SDI port, a webcam plugged into a USB port or Firewire port, Ethernet cable connecting an IP camera to a Power over Ethernet port, FPD-Link, etc.

Other such cables and ports, transmitting data one bit at a time, include Serial ATA, Serial SCSI, Ethernet cable plugged into Ethernet ports, the Display Data Channel using previously reserved pins of the VGA connector or the DVI port or the HDMI port.

Serial buses[edit]

Many communication systems were generally designed to connect two integrated circuits on the same printed circuit board, connected by signal traces on that board (rather than external cables).

Integrated circuits are more expensive when they have more pins. To reduce the number of pins in a package, many ICs use a serial bus to transfer data when speed is not important. Some examples of such low-cost serial buses include RS-232, SPI, I²C, UNI/O, 1-Wire and PCI Express.

Serial versus parallel[edit]

The communication links, across which computers (or parts of computers) talk to one another, may be either serial or parallel. A parallel link transmits several streams of data simultaneously along multiple channels (e.g., wires, printed circuit tracks, or optical fibers); whereas, a serial link transmits only a single stream of data.

Although a serial link may seem inferior to a parallel one, since it can transmit less data per clock cycle, it is often the case that serial links can be clocked considerably faster than parallel links in order to achieve a higher data rate. Several factors allow serial to be clocked at a higher rate:

• Clock skew between different channels is not an issue (for unclocked asynchronous serial communication links).
• A serial connection requires fewer interconnecting cables (e.g., wires/fibers) and hence occupies less space. The extra space allows for better isolation of the channel from its surroundings.
• Crosstalk is less of an issue, because there are fewer conductors in proximity.

Serial Port Switch

In many cases, serial is cheaper to implement than parallel. Many ICs have serial interfaces, as opposed to parallel ones, so that they have fewer pins and are therefore less expensive.

Examples of architectures[edit]

• ARINC 818 Avionics Digital Video Bus
• Atari SIO (Joe Decuir credits his work on Atari SIO as the basis of USB)
• Binary Synchronous Communications BSC - Binary Synchronous Communications
• CAN Control Area Network Vehicle Bus
• ccTalk Used in the money transaction and point-of-sale industry
• CoaXPress industrial camera protocol over Coax
• DMX512 control of theatrical lighting
• Fibre Channel (high-speed, for connecting computers to mass storage devices)
• InfiniBand (very high speed, broadly comparable in scope to PCI)
• I²C multidrop serial bus
• MIDI control of electronic musical instruments
• RS-232 (low-speed, implemented by serial ports)
• RS-422 multidrop serial bus
• RS-485 multidrop multimaster serial bus
• SDI-12 industrial sensor protocol
• SONET and SDH (high speed telecommunication over optical fibers)
• SpaceWire Spacecraft communication network
• T-1, E-1 and variants (high speed telecommunication over copper pairs)
• Universal Serial Bus (for connecting peripherals to computers)
• UNI/O multidrop serial bus
• 1-Wire multidrop serial bus

See also[edit]

• High-Level Data Link Control (HDLC)
• Universal asynchronous receiver/transmitter (UART)

References[edit]

External links[edit]

• Serial Interface Tutorial for Robotics (contains many practical examples)

MVI56E-GSC/GSCXT

Com Port Slot

The Generic ASCII Serial Enhanced Communication Modules allow Rockwell Automation ControlLogix Programmable Automation Controllers (PACs) to easily interface with serial devices using non-specific ASCII character text string or byte value serial communication protocols.

MVI56E-GSC enhancements include local and remote diagnostics through the module's Ethernet port, CIPconnect technology for bridging through Rockwell Automation ControlNet and EtherNet/IP networks, and an on-board web server containing status information, module documentation, and sample program files.

The MVI56E-GSC module is a fast and easy way to add two fully configurable serial communication ports to the ControlLogix platform, eliminating the need to use the front port of the processor or to consume valuable processing time sending and receiving serial messages.

The module is a single-slot, backplane-compatible solution. Each port is capable of sending and receiving large ASCII character strings or byte streams of up to 4096 characters or bytes. Many different serial communication devices can be integrated into the ControlLogix platform by building upon the sample ladder logic provided for this module.

A conformal coating option is available for this product.

Architectures

Features and Benefits

Specifications

• Backward-compatible with previous MVI56-GSC version
• Single Slot - 1756 ControlLogix backplane compatible
• 10/100 MB Ethernet port for network configuration and diagnostics with Auto Cable Crossover Detection
• User-definable module data memory mapping of up to 5000 16-bit registers
• CIPconnect-enabled network diagnostics and monitoring using ControlLogix 1756-ENxT modules and EtherNet/IP pass-thru communications
• Sample Ladder Logic or Add-On Instruction (AOI) used for data transfers between module and processor and for module configuration
• Internal web page providing access to product documentation, module status, and firmware update software
• 4-character, scrolling LED display of status and diagnostic data in plain English
• ProSoft Discovery Service (PDS) software finds the module on the network and assigns a temporary IP address to facilitate module access

Hardware

Downloads

Videos

Guide to bit-level data addressing in ProSoft Modbus modules

Guide to 32-bit data types in ProSoft Modbus modules

Certifications