Home » Products » Data Sheets


VL-EPMs-U1SUMIT Serial Communications + GPS Receiver

SUMIT Serial Communications + GPS Receiver

Serial communications module with support for SUMIT and PC/104 stackable expansion buses. Features on-board GPS receiver capabilities.


The VL-EPMs-U1 is OBSOLETE. This data sheet is viewable for reference only from an INTERNAL VERSALOGIC WORKSTATION. It does NOT appear to normal users on our public website.


  • SUMIT™ Compatible
    Highly rugged SUMIT-104 format.
  • Serial I/O
    Up to six serial ports enable communication with multiple peripheral devices.
  • On-board GPS Receiver
    Optional 12-channel GPS module supports NMEA 0183, TSIP, TAIP, and DGPS protocols.
  • Extended Temperature Operation
    -40° to +85°C operation for harsh environments.
  • MIL-STD-202G
    Qualified for high shock/vibration environments.

Software Expertise: Reference & Software Expertise

OS Compatibility: Win 10 Windows/Win 8/Win 7/Win XP, Windows Embedded Win Std 7/Win XPe/Win CE, Linux, Wind River, QNX, DOS

Embedded PC/104+ ModuleRoHS-compliant



The VL-EPMs-U1 module provides advanced serial communications and Global Positioning System (GPS) capabilities in embedded systems. Based on the SUMIT-104 form factor, the VL-EPMs-U1 supports SUMIT and PC/104™ stackable expansion buses. With a compact rugged form factor and low power consumption (700 mW typ.), the VL-EPMs-U1 is well suited to size, weight, and power constrained applications. A full industrial temperature rating and certification to MIL-STD-202G specifications for shock and vibration ensure reliable operation in harsh, mobile, and/or remote environments.

Like all VersaLogic products, the VL-EPMs-U1 is designed to support OEM applications where high reliability and long-term availability are required. From application design-in support, to its 5+ year production life guarantee, the VL-EPMs-U1 provides a durable embedded computer solution with an excellent cost of ownership. The VL-EPMs-U1 is manufactured and tested to the highest quality standards and is fully RoHS compliant. Customization is available, even in low OEM quantities.


With up to six serial ports, the VL-EPMs-U1 provides traditional hardwired serial I/O functions for legacy communications. RS-232 serial ports operate in 4-wire mode at 115 Kbps; RS-485 mode adds auto-direction control and high-speed 460 Kbps transmission.

When equipped with the optional Trimble® Lassen® iQ GPS receiver, the VL-EPMs-U1 delivers complete position, velocity, and time (PVT) data for use in host applications. The Lassen iQ provides simultaneous 12-channel operation for stable satellite tracking and aided GPS startup for fast initial signal acquisition. Dual GPS signal sensitivity modes enable reliable tracking in difficult environments with weak satellite signals. GPS data is available in popular NMEA, TSIP, TAIP, or DGPS protocols. The GPS data is accessed through two on-board serial ports. An antenna with interface cabling is available for evaluation, testing, and software development.

Designed for full industrial (-40° to +85°C) temperature operation; the VL-EPMs-U1 is built to withstand thermal extremes and meets MIL-STD-202G specifications for mechanical shock and vibration. Transient voltage suppression (TVS) devices on the serial port I/O lines provide enhanced electrostatic discharge (ESD) protection for the system. Fault protection on the GPS antenna guards against open and short circuits.

Based on an industry standard 16C550 I/O controller, the VL-EPMs-U1 is fully compatible with a variety of popular operating systems including Windows, Windows Embedded, Linux, VxWorks, and QNX using standard serial I/O software drivers.

VersaLogic products are designed for use by OEMs working in a variety of market applications: Aerospace, Defense, Energy, Industrial, Security, Medical, Military, Robotics, and Transportation. Anywhere that the need for superb quality and high-performance embedded computing exists, applications include: automation, avionics, gateway, in-vehicle, monitoring, simulation, and vision.

VersaLogic delivers extremely reliable standard and customized embedded computers backed with unsurpassed service and the highest availability in the market. VersaLogic exists to exceed customers' product, service, support and delivery needs - whenever and wherever the need arises.


General Board Size PC/104 standard: 90 mm x 96 mm (3.55" x 3.78")
Power Requirements +5V @ 140 mA (700 mW)
Stackable Bus SUMIT-104: SUMIT-A, SUMIT-B[a], ISA[a/b]
RoHS Compliant
Environmental Operating Temperature -40° to +85°C
Storage Temperature -40° to +85°C
Airflow Requirements Free air from -40° to +85°C
Thermal Shock 5°C/min. over operating temperature
Humidity Less than 95%, noncondensing
Vibration, Sinusoidal Sweep MIL-STD-202G, Method 204, Modified Condition A: 2g constant acceleration from 5 to 500 Hz, 20 minutes per axis
Vibration, Random MIL-STD-202G, Method 214A, Condition A: 5.35g rms, 5 minutes per axis
Mechanical Shock MIL-STD-202G, Method 213B, Condition G: 20g half-sine, 11 ms duration per axis
Device I/O COM 1 / 2 Interface[c] RS-232. 16C550 compatible. 115 Kbps.
COM 3 / 4 Interface[c/d] RS-232/422/485 selectable. 16C550 compatible. 460 Kbps.
COM 5 / 6 Interface[c] RS-232/422/485 selectable. 16C550 compatible. 460 Kbps.
GPS[a] Module Trimble Lassen iQ GPS module: L1 (1575.42 MHz) frequency, C/A code, 12-channel, continuous tracking receiver
Update Rate TSIP @ 1 Hz; NMEA @ 1 Hz; TAIP @ 1 Hz
Accuracy Horizontal: < 5 meters (50%), < 8 meters (90%)
Altitude: < 10 meters (50%), < 16 meters (90%)
Velocity: 0.06 m/s
PPS (static): ±50 ns
Acquisition Reacquisition: < 2 sec (90%)
Hot Start[e]: < 10 sec (50%), < 13 sec (90%)
Protocols NMEA 0183 v3.0, TSIP, TAIP, and DGPS (RTCM SC-104)
Antenna[f] Supports active antennas with HFL, MCX, or SMA connectors
Software Operating Systems Compatible with most x86 operating systems, including Windows, Windows Embedded, Linux, VxWorks, and QNX
[a] Optional
[b] Pass-through only
[c] TVS protected port (enhanced ESD protection)
[d] Serial ports 3 and 4 are optionally utilized by the GPS receiver
[e] Hot start implies last position, time, almanac, and ephemeris are saved by backup power
[f] Fault protected (open and short circuit)
Data represents standard operation at +25°C with +5V supply unless otherwise noted. Specifications are subject to change without notification. PC/104 is a trademark of the PC/104 Consortium. SUMIT is a trademark of the SFF-SIG. Trimble and Lassen are registered trademarks of Trimble Navigation Ltd. All other trademarks are the property of their respective owners.

Software Support Packages

Operating System Compatibility

Win 10 - Meets Specifications
Win 8 - Meets Specifications
Win 7 - Meets Specifications
Win XP - Meets Specifications
Win Std 7 - Meets Specifications
Win XPe - Meets Specifications
Win CE - Meets Specifications
Debian - Meets Specifications
Ubuntu - Meets Specifications
Knoppix - Meets Specifications
VxWorks - Meets Specifications
Neutrino - Meets Specifications
DOS - Meets Specifications


Part Number Description Photo
VL-CBR-2001RS232 cable, 20-pin to 2xDB-9M, 12"
VL-CBR-ANT02GPS antenna with SMA connector - supports GPS signals , 5m
VL-HDW-105Standoff package, 0.6", Metric thread
VL-HDW-106Standoff package, 0.6", English thread
VL-HDW-203PC/104 extractor tool (metal)

Ordering Information

Model Serial Channels GPS Stackable Bus Digi-Key logo
VL-EPMs-U1G* 2 Yes SUMIT-AB + ISA[b]
VL-EPMs-U1H* 4 Yes SUMIT-AB + ISA[b]
* Special Order Product. Contact VersaLogic Sales for minimum order quantities and lead time.