RS422 Network Cards and Network Controllers
Last Updated: April 1, 2025
Description
RS422 Network Cards and Network Controllers are designed to facilitate serial communication by supporting high-speed data transmission over longer distances compared to other standards like RS-232. They enable the connection of multiple devices in a network, allowing for efficient data exchange between a single transmitter and multiple receivers.
Working Principle
RS422 operates using differential signaling, which involves transmitting data through two complementary signals on paired wires. This method enhances the transmission rate and reduces signal interference caused by ground shifts and noise. The RS422 standard allows for a multi-drop configuration, where one driver can control a bus with up to 10 receivers. This setup is particularly useful for extending the reach of RS-232 signaling and controlling remote equipment.
Applications
RS422 is commonly used in scenarios where data needs to be transmitted over long distances with minimal interference. Specific applications include broadcast automation and post-production editing industries, where it is essential to control remote equipment reliably.
Advantages over other Network Cards and Network Controllers
RS422 offers several advantages over other network standards like RS-232 and RS-485. It supports higher transmission rates and longer distances, up to 1.2 kilometers at 110 kbps. Unlike RS-232, RS422 can handle multiple receivers, making it more suitable for complex network setups. Its differential signaling reduces the impact of noise and ground potential differences, providing more reliable communication.
Limitations
One limitation of RS422 is that it only allows for one transmitter on the bus, which can restrict its use in applications requiring multiple transmitters. Additionally, while it supports multiple receivers, the number is limited to 10, which may not be sufficient for larger network configurations.
Considerations
When considering RS422 Network Cards and Network Controllers, it is important to evaluate the initial costs and operating expenses. The durability and accuracy of RS422 systems are generally high due to their robust design and noise resistance. However, maintenance and replacement costs should be considered, especially in environments where long-distance communication is critical. The choice of connectors and the need for additional conductors over long distances can also impact the overall cost and complexity of the system.
from ACCES I/O Products, Inc.
Features. Universal PCI, PCI-X, 3.3V and 5V compatible (Call for PCI-Express availability). Dual-port serial communications card for PCI bus. Supports RS-232(PCI-COM2S only), RS-422, and RS-485 protocols. Automatic control of RS-485 driver under Windows systems. Includes type 16550 UART with 16-byte... [See More]
- Port Type: RS422; RS485
- Data Rate: 460
- Protocol / Network: Serial
- Host Bus: PCI
from ProSoft Technology, Inc.
The ADMNET solution is a powerful module designed with both Client and Server support. This broad support enables the module to function as a data collection sub-master, or to be a powerful slave as a remote off an HMI host. Applications for the module are found in most industries, especially... [See More]
- Port Type: RS232; RS422; RS485
- Host Bus: CompactLogix
- Protocol / Network: 10Base-T Ethernet; Fast Ethernet; Serial
- Operating Temperature: 0 to 60
from ACCES I/O Products, Inc.
Features. An independent, completely configurable, serial port. Supports conventional RS232, High-speed RS-422, and Multi-drop RS-485. Supports all standard RS-232 lines: TD, RD, RTS, CTS, DCD, DTR, and DI. Can be wired for 2 or 4 wire RS-422/485 communications. Supports RS-485 handshaking on-board... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial
- Host Bus: ISA
from ProSoft Technology, Inc.
Powerful platform for developing and running 'C' applications on Rockwell Automation's CompactLogix processors. The MVI69 Application Development Module is a single slot, backplane compatible solution for the Rockwell Automation CompactLogix platform. This module is a powerful and programmable... [See More]
- Port Type: RS232; RS422; RS485
- Host Bus: CompactLogix
- Protocol / Network: Serial
- Operating Temperature: 0 to 60
from ACCES I/O Products, Inc.
Features. Four independent, completely configurable, serial ports. Supports High-speed RS-422 (COM422/4) or Multi-drop RS-485 (COM485/4). Supports RS-485 handshaking on-board without special drivers to support Windows and non-DOS programs (COM485/4 only). Built-in support for local echo, line... [See More]
- Port Type: RS422
- Data Rate: 115
- Protocol / Network: Serial
- Host Bus: ISA
from ProSoft Technology, Inc.
Powerful platform for developing and running 'C' applications on Rockwell Automation's SLC processors. The MVI46-ADM module is a single slot, backplane compatible solution for the Rockwell Automation SLC platform. This module is a powerful and programmable solution supporting two fully isolated... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial
- Host Bus: Allen Bradley - SLC
from ACCES I/O Products, Inc.
Features. Completely configurable, asychronous serial port (ICOM-2S has two ports). Opto-Isolated against noisy environments. Support conventional High-speed RS-422, and Multi-drop RS-485. Can be wired for 2 or 4 wire RS-422/485 communications. Support RS-485 handshaking on-board without special... [See More]
- Port Type: RS422; RS485
- Data Rate: 38.4
- Protocol / Network: Serial
- Host Bus: ISA
from ProSoft Technology, Inc.
The ADMNET solution is a powerful module designed with both Client and Server support. This broad support enables the module to function as a data collection sub-master, or to be a powerful slave as a remote off an HMI host. Applications for the module are found in most industries, especially... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: 10Base-T Ethernet; Fast Ethernet; Serial
- Host Bus: Allen Bradley - SLC
from ACCES I/O Products, Inc.
Features. Supports RS-422 and RS-485 asynchronous communication on the ISA bus. Automatic control of RS-485 driver under Windows systems. Includes type 16550 UARTs with 16-byte FIFO buffers. Can be set up as COM1, 2, 3, 4, or any other I/O bus address. Baud rates up to 460,800 baud. Model... [See More]
- Port Type: RS422; RS485
- Data Rate: 460
- Protocol / Network: Serial
- Host Bus: ISA
from ProSoft Technology, Inc.
The ADM module is a single-slot, backplane compatible solution for the Quantum platform that supports user-developed applications. "C" code applications are developed using Digital Mars C++ 16-bit development tools (included), downloaded to, and then debugged on the module. The ProTalk module is a... [See More]
- Port Type: RS232; RS422; RS485
- Operating System: MS-DOS
- Protocol / Network: Serial
- Operating Temperature: 0 to 60
from ACCES I/O Products, Inc.
Features. Universal PCI, PCI-X, 3.3V and 5V compatible (Call for PCI-Express availability). Optically isolated, asynchronous serial communications. Two independent ports each supports RS-422 or RS-485 communications. Type 16550 buffered UARTs protect against data loss in multitasking systems. Baud... [See More]
- Port Type: RS422; RS485
- Data Rate: 460
- Protocol / Network: Serial
- Host Bus: PCI
from ProSoft Technology, Inc.
Powerful platform for developing and running 'C' applications on Rockwell Automation's PLC processors. The MVI71-ADM module is a single slot, backplane compatible solution for the Rockwell Automation PLC platforms. This module is a powerful and programmable solution supporting two fully isolated... [See More]
- Port Type: RS232; RS422; RS485
- Host Bus: Allen Bradley - PLC
- Protocol / Network: Serial
- Number of Ports: 3
from ACCES I/O Products, Inc.
Features. Type II PCMCIA Card. Plug-N-Play Windows Installation. Asynchronous RS-485 or RS-422 Serial Port. Type 16550 16-Byte Buffered UART. Baud Rates to 115Kbaud. Automatic Send-Data Control for Windows Compatibility. Extended AT Interrupts (2-7, 10-12, 14 & 15). DB-9 Male Connector via cable... [See More]
- Port Type: RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial
- Host Bus: PCMCIA
from ProSoft Technology, Inc.
Powerful platform for developing and running 'C' applications on Rockwell Automation's ControlLogix processors. The MVI56-ADM module is a single slot, backplane compatible solution for the Rockwell Automation ControlLogix platform. This module is a powerful and programmable solution supporting two... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial
- Host Bus: Allen Bradley - ControlLogix
from ACCES I/O Products, Inc.
FEATURES. Universal PCI, PCI-X, 3.3V and 5V compatible (Call for PCI-Express availability). Supports RS-422 and RS-485 protocols. Automatic control of RS-485 driver under all operating systems. Includes type 16550 UART with 16-byte FIFO buffers. Baud rates up to 460,800 baud. Detected as standard... [See More]
- Port Type: RS422; RS485
- Data Rate: 460
- Protocol / Network: Serial
- Host Bus: PCI
from ProSoft Technology, Inc.
Powerful platform for developing and running 'C' applications on Rockwell Automation's FLEX I/O processors. The MVI94-ADM module is a single slot, backplane compatible solution for the Rockwell Automation FLEX I/O and Integra I/O platforms. This module is a powerful and programmable solution... [See More]
- Port Type: RJ-45; RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial
- Host Bus: Flex I/O
from ACCES I/O Products, Inc.
Features. 2 independent optically-isolated asynchronous serial COM ports. Field selectable RS-422 and RS-485, independent for each port. Auto-RTS feature makes half-duplex RS-485 communications effortless. Fixed bias and jumper selectable termination provided on each transmit and receive channel... [See More]
- Port Type: RS422; RS485
- Data Rate: 460
- Protocol / Network: Serial
- Host Bus: PC/104
from ProSoft Technology, Inc.
The MVI56-DH485 module actively issues DH-485 commands to other nodes on the DH-485 network. One hundred user-defined commands are supported by the module on each port. The ControlLogix processor can be programmed to control the activity on the port by actively enabling or disabling each command... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 19.2
- Protocol / Network: Serial; DH485
- Host Bus: Allen Bradley - ControlLogix
from ACCES I/O Products, Inc.
Features. Universal PCI, PCI-X, 3.3V and 5V compatible (Call for PCI-Express availability). Four-port serial communications card for PCI bus. Supports RS-422 protocol. Includes type 16550 UART with 16-byte FIFO buffers. Baud rates up to 460,800 baud. Choice of I/O connection methods. Detected as... [See More]
- Port Type: RS422
- Data Rate: 460
- Protocol / Network: Serial
- Host Bus: PCI
from ProSoft Technology, Inc.
The ProSoft 3150-EMC master module allows the user to easily configure one or both ports to actively exchange data with up to eight Emerson FX Drives. The 3150-EMC (Emerson FX drive master module) product family allows Allen-Bradley 1746 I/O compatible processors to easily interface as a host with... [See More]
- Port Type: RS232; RS422
- Host Bus: Allen Bradley - SLC
- Protocol / Network: Serial
- Operating Temperature: 0 to 60
from ACCES I/O Products, Inc.
Features. This product has been discontinued. Please contact us for help in finding a suitable replacement. Great News! ACCES has designed the replacement for this discontinued product. Just a click away to the LPCI-COM485/8!. Universal PCI, PCI-X, 3.3V and 5V compatible (Call for PCI-Express... [See More]
- Port Type: RS422
- Data Rate: 460
- Protocol / Network: Serial
- Host Bus: PCI
from ProSoft Technology, Inc.
The MVI46-DFCM Master/Slave Communications module allows Rockwell Automation SLC I/O compatible processors to interface easily with other DF1 protocol compatible devices. Compatible devices include not only Rockwell Automation PLCs (which all support the DF1 protocol) but also a wide assortment of... [See More]
- Port Type: RS232; RS422; RS485
- Host Bus: Allen Bradley - SLC
- Protocol / Network: Serial; DF1
- Number of Ports: 2
from ProSoft Technology, Inc.
The MVI71-DFCM Master/Slave Communications module allows Rockwell Automation PLC I/O compatible processors to interface easily with other DF1 protocol compatible devices. Compatible devices include not only Rockwell Automation PLCs (which all support the DF1 protocol) but also a wide assortment of... [See More]
- Port Type: RS232; RS422; RS485
- Host Bus: Allen Bradley - PLC
- Protocol / Network: Serial; DF1
- Number of Ports: 3
from ProSoft Technology, Inc.
The ProSoft Technology MVI94-DFCM module is the fastest and easiest way to add DF1 Half/Full Duplex Master and Slave capability to the FLEX platform. The MVI94-DFCM module is a single I/O slot, backplane compatible solution for the Allen-Bradley FLEX platform. This module has one powerful and fully... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial; DF1
- Host Bus: Flex I/O
from ProSoft Technology, Inc.
The module has two serial ports supporting the DF1 protocol, with each port user configurable to act as a Master or as a Slave. Data transfer between the module and the Quantum processor is asynchronous to the DF1 network, with the module's internal database being used to exchange data between the... [See More]
- Port Type: RS232; RS422; RS485
- Number of Ports: 2
- Protocol / Network: Serial
- Operating Temperature: 0 to 60
from ProSoft Technology, Inc.
The module has two serial ports supporting the DF1 protocol, with each port user-configurable to act as a master or as a slave. Data transfer between the module and the CompactLogix processor is asynchronous to the DF1 network, with the module's internal database being used to exchange data between... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial; DF1
- Host Bus: CompactLogix
from ProSoft Technology, Inc.
The module supports DNP Subset Level 2 features and some of the Level 3 features allowing the many SCADA and field devices supporting the DNP protocol to be integrated into the PLC platform. The module acts as an input/output module between the DNP network and the PLC backplane. The data transfer... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial; DNP 3.0
- Host Bus: Allen Bradley - PLC
from ProSoft Technology, Inc.
The module supports DNP Subset Level 2 features and some of the Level 3 features allowing the many SCADA and field devices supporting the DNP protocol to be integrated into the CompactLogix platform. The module acts as an input/output module between the DNP network and the CompactLogix backplane. [See More]
- Port Type: RS232; RS422; RS485
- Host Bus: CompactLogix
- Protocol / Network: Serial; DNP 3.0
- Operating Temperature: 0 to 60
from ProSoft Technology, Inc.
The module supports DNP Subset Level 2 features and some of the Level 3 features allowing the many SCADA and field devices supporting the DNP protocol to be integrated into the Quantum or Unity platform. The module acts as an input/output module between the DNP network and the Modicon backplane. The... [See More]
- Port Type: RS232; RS422; RS485
- Number of Ports: 2
- Protocol / Network: Serial; DNP
- Operating Temperature: 0 to 60
from ProSoft Technology, Inc.
The ProTalk Liquid & Gas Flow Computer Module is a Quantum backplane compatible module that allows Quantum processors to easily support flow applications performing measurement of hydrocarbon gases or liquids using AGA 3, 7, 8 and API 2540 measurement standards. The module calculates flow rates,... [See More]
- Port Type: RS232; RS422; RS485
- Operating System: Windows 95/98; Windows NT; Windows 2000; Windows XP
- Protocol / Network: Serial
- Operating Temperature: 0 to 60
from ProSoft Technology, Inc.
The MVI94-GSC module has two active serial ports. PRT2 is jumper-configured for direct or multi-drop field communication via RS-232/422/485. Two ASCII ports are configured independently, allowing the module to operate using numerous configurations. Once configured via ladder logic, the module will... [See More]
- Port Type: RS232; RS422; RS485
- Data Rate: 115
- Protocol / Network: Serial
- Host Bus: Flex I/O
from ProSoft Technology, Inc.
Five servers and clients are present on the module permitting both the reception and transmission of data between the Quantum or Unity processor and attached devices. The PTQ-GEC module is a powerful communication interface for Quantum platform processors. Developed under license from Schneider... [See More]
- Port Type: RS232; RS422; RS485
- Operating Temperature: 0 to 60
- Protocol / Network: 10Base-T Ethernet; Fast Ethernet; TCP/IP
- Operating Humidity: 5 to 95
from ProSoft Technology, Inc.
The MVI71-N2 module acts as an input/output module between the Johnson Controls N2 network and the Rockwell Automation backplane. The module acts as a slave receiving commands from a master device. The data transfer from the PLC processor is asynchronous from the actions on the Johnson Controls... [See More]
- Port Type: RS232; RS422; RS485
- Host Bus: Allen Bradley - PLC
- Protocol / Network: Serial; Johnson Controls N2
- Operating Temperature: 0 to 60
from ProSoft Technology, Inc.
The PTQ-103M supports up to 32 total field devices between the module's two IEC 60870-5-103 Master ports. The module's communication ports can each be independently configured, allowing two separate field networks to be implemented. The field device data is exchanged between the ProTalk module and... [See More]
- Port Type: RS232; RS422; RS485
- Number of Ports: 2
- Protocol / Network: Serial
- Operating Temperature: 0 to 60
from ProSoft Technology, Inc.
The MVI56 IEC 60870-5-103 Master Communication Module allows Rockwell Automation ControlLogix backplane I/O compatible processors to interface easily with IEC 60870-5-103 compatible devices. Devices commonly supporting the protocol include relays, breakers, sub-station Communication Modules and... [See More]
- Port Type: RS232; RS422; RS485
- Number of Ports: 2
- Protocol / Network: Serial
- Operating Temperature: 0 to 60
from ProSoft Technology, Inc.
The PTQ-101S module is the fastest and easiest way to add IEC 60870-5-101 protocol interface support to the Quantum platform. It is a single slot, backplane compatible solution for the Schneider Electric Quantum platform. The PTQ-101S module acts as an input/output module between the IEC 60870-5-101... [See More]
- Port Type: RS232; RS422; RS485
- Operating Temperature: 0 to 60
- Protocol / Network: Serial
- Operating Humidity: 5 to 95