--- type: product schema_version: 1 stock_number: "68904-9" canonical_url: "https://www.artisantg.com/68904-9/Acromag-PMC521" json_url: "https://www.artisantg.com/68904-9/Acromag-PMC521.json" generated_at: "2026-11-07T06:14:29.814Z" last_updated: "2026-10-14T13:00:51.160-05:00" --- # Acromag PMC521 422/485 Octal Serial Communication Module _Summary and Categories are this item's record. The description sections and FAQ are machine-assisted and can contain errors; where they disagree with the record, the record is correct, and where description sections disagree with each other, Details wins._ ## Summary - Manufacturer: Acromag - Model: PMC521 - Condition: New From Surplus Stock - Price: $1,995.00 USD - Availability: In stock, 2 available - Warranty: 1-Year Warranty with 30-Day Return Guarantee - ITAR restricted: No - Shipping weight: 1 lb, estimated - Shipping dimensions: 8X8X3 in, estimated ## Categories - Test Equipment > Electrical Test > Serial (primary) - Military and Embedded Equipment > Embedded & Industrial > PMC ## Details This unit is sealed in the manufacturer's static bag. ### Configuration - Front I/O Connector - (8) Asynchronous Full Duplex EIA/TIA-422B Serial Ports (Supports EIA-485) ## Overview Octal serial communication module integrating 422/485 protocols with high-speed data transfer capabilities. Features eight independent channels supporting RS-422/485 standards, programmable baud rates up to 921.6 kbps, and full/half-duplex operation. Operates in PMC mezzanine form factor with PCI bus interface compatibility. Provides hardware flow control, 128-byte FIFOs per channel, and programmable termination. Designed for industrial control systems, telecommunications equipment, data acquisition systems, and embedded applications requiring multiple serial interfaces. Includes DMA capabilities and interrupt support for efficient data handling in real-time processing environments. ## Function Provides eight asynchronous, full-duplex serial communication ports supporting EIA/TIA-422B and EIA-485 standards on a single PMC socket; each port features 64-byte transmit and receive FIFO buffers for efficient data handling, programmable baud rates up to 1.8432 Mbps, and hardware interrupts for transmit, receive, line status, data set, and flow control events; includes line-break and false start-bit detection, failsafe receivers, socketed termination and bias resistors, and industry-standard 16C550 register compatibility, enabling robust multi-channel serial data interfacing in embedded computing environments. ## Platform Designed for integration into PCI Mezzanine Card (PMC) sockets, this module provides eight asynchronous full duplex serial communication ports compliant with EIA/TIA-422B and supporting EIA-485 signaling standards. It interfaces via standard PMC connectors on embedded computing platforms, offering programmable baud rates up to 1.8432 Mbps with 64-byte FIFO buffers for transmit and receive lines per channel. It supports interrupt-driven operation with individually controlled line status, flow control, and data interrupts, suitable for industrial and embedded systems requiring multiport serial connectivity with configurable line termination and biasing resistors. Operating temperature ranges vary by model, supporting both commercial and extended temperature environments. ## Application Eight-channel RS-422/485 serial communication interface supporting full-duplex RS-422 and half-duplex RS-485 operations with programmable baud rates up to 921.6 kbps per channel. Common applications include industrial automation systems requiring multiple serial device connections, SCADA networks, multi-drop RS-485 bus implementations, legacy equipment integration, distributed control systems, factory floor data acquisition, process control networks, and terminal server applications where multiple serial devices must interface with VMEbus-based computing platforms through high-speed, noise-immune differential signaling over extended distances. ## Accessories 8 RS-422/485 serial ports via DB37 female connector on front panel. Each port supports full/half duplex, auto-direction control, termination resistors, and data rates to 921.6 kbps. Requires PMC carrier board with PCI Mezzanine Card interface supporting 5V operation. Uses 16C554 UARTs with 16-byte FIFOs. Supports interrupt driven or polled operation. Optional cable breakout accessories provide individual DB9 or terminal block connections per channel. PMC P1 connector provides PCI bus interface, P2 connector unused. Single +5V power from carrier. ## Interface Eight RS-422/485 serial ports with RJ45 connectors. PCI mezzanine card (PMC) form factor with 32-bit PCI interface (33/66 MHz), compatible with IEEE 1386 specifications. Connects via 64-pin connector to carrier board. Features selectable termination resistors and software-controlled transceivers. Serial ports configurable for full/half duplex operation with programmable baud rates up to 921.6 Kbps. ## Images - -