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PC/104 4-Port RS-232/422/485 Serial I/O Module with DIO
  • Details
  • Specification
  • Order information
  • 4 programmable RS-232/422/485 ports
  • Data rates: RS-232 mode up to 1Mbps, RS-422/485 modes up to 10Mbps
  • 48 programmable digital I/O lines
  • Extremely rugged -40°C to +85°C operating temperature
High Performance Serial I/O Functionality

The Emerald‑MM‑DIO4M‑XT is a PC/104 form factor serial module offering 4 programmable serial ports. The module is based on a ST16C554 quad UART with 16-byte TX/RX FIFOs. Programmable features include serial port protocols, line termination, slew rates, enable / shutdown, base addresses, and interrupt status register address. The EMM-DIO4M-XT fits a wide variety of rugged and on-vehicle embedded serial I/O application needs.

Digital I/O Lines

EMM-DIO4M-XT also offers 48 programmable digital I/O lines. Configurable features include the digital I/O base address, interrupt level, output mode, and voltage level selection. The lines can be set for pull-up / pull-down resistors in two banks of 24 digital I/O lines each.

Rugged Design

The Emerald-MM-DIO4M-XT was designed with harsh applications in mind including latching connectors to further improve reliability. Extended temperature operation of −40°C to +85°C is tested and guaranteed. The module is compatible with MIL-STD-202G shock and vibration specifications.

Key Features

Emerald-MM-DIO4M-XT is a programmable PC/104 serial I/O module offering 4 multiprotocol serial ports and 48 digital I/O lines. The serial ports are based on a ST16C554 quad UART with 16-byte TX/RX FIFOs. Each serial port can be independently configured for RS-232, RS-422, or RS-485 protocols, along with programmable 120-ohm line termination. Other programmable serial port features include slew rate, enable / shutdown and base address. All serial ports also feature +/-15KV ESD protection. The serial ports are brought out in pairs to two pin headers with latching connectors for increased isolation and ruggedness. With its wide operating temperature range and high resistance to shock and vibration, the EMMDIO4M-XT fits a wide variety of rugged and on-vehicle embedded serial I/O application needs. EMM-DIO4M-XT also offers 48 programmable digital I/O lines configured as six 8-bit ports. All ports have individual direction control. Ports 0, 1 and 2 offer programmable edge detection with interrupt capability on change of state. Other programmable DIO features include pull-up / pull-down resistors, base address, interrupt level, output mode, and voltage level.

Software Support

The EMM-DIO4M-XT is compatible with Windows 7/Vista/2000/XP and Linux 2.6. All drivers are shipped with the product.

Technical specifications
Number of serial ports4
ProtocolsRS-232/422/485 programmable
Maximum baud rateRS-232: 1Mbps
RS-422/485: 10Mbps
UARTST16C554 quad UART
16-byte TX/RX FIFOs
TransceiversSP335E multiprotocol transceivers, one per port
Programmable serial featuresSlew rate
Enable / shutdown
Base address
TerminationJumper programmable RS-422/485 line termination
ESD+/-15KV protection on each port
Digital I/O48 programmable digital I/O lines
Programmable DIO featuresPull-up / pull-down resistors in 2 banks of 24 lines each
Base address
Interrupt level
Output mode
Voltage level
ConnectorsLatching connectors for increased ruggedness
Power Input+5VDC +-5%
Software driversWindows Embedded Standard 7, XP, 2000, and Vista
Linux 2.6.16, 2.6.31 and 2.6.32
Form FactorPC/104 3.55” x 3.775” (90mm x 96mm)
Environmental and physical specifications
Operating Temperature-40ºC to +85ºC (-40ºF to +185ºF)
Operating Humidity5-95% non-condensing
ShockMIL-STD-202G compatible
VibrationMIL-STD-202G compatible
Model Description
 EMM-DIO4M-XT  4-port PC/104 Programmable Serial Module with Digital I/O
 C-DB9M-2  Dual DB9 male serial port cable
 C-50-18  Digital I/O 50-conductor 18” ribbon cable
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