PC/104 4-port RS-232/422/485

  • Description
  • Specifications
  • Ordering Guide

EMM-4M module offers you 4 RS-232/422/485 serial ports operating at speeds up to 115kbps.

In RS-232 mode, the full complement of standard PC serial port signals (8 signals + ground) are provided for each port and are grouped onto two 20-pin headers (2 ports per header). In RS-422 mode, Signals RX+, RX-, TX+, and TX- are provided, along with ground. In RS-485 mode, signals TX+/RX+ and TX-/RX- are provided, along with ground.

A 16C554 quad serial port IC is used for the serial ports. This chip supports data transfer rates up to 115kbps and contains a 16-byte programmable FIFO buffer for each port to minimize processor overhead.

Number of serial ports 4-ports
Protocol RS-232, RS-422, RS-485 (jumper selected)
Control Signals RS-232: DTR, DSR, RTS, CTS, RI, TxD, RxD, DCD
RS-422/485: TxD±. RxD±
Maximum baud rate Up to 115.2 Kbps
I/O Addresses Jumper selectable I/O addresses
Interrupts Jumper selectable IRQ
Bus PC/104
Dimensions 90 x 96 mm
Power supply +5VDC ±5% @ 80mA max.
Operating Temperature -40 to +85°C


Model Description
EMM-4M-XT PC/104 4-port RS-232/422/485