MSSLite Embedded Device Server |
MSSLITE-B1
MSSLITE-B2
MSSLITE-C MSSLITE-C1A
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Lantronix's MSSLite Embedded Device Server is a board-level Device Server that allows OEM design engineers to integrate Lantronix's MSS network-enabling technology into their designs. The MSSLite Device Server is designed on a compact 3.3 inch by 2.3 inch board with convenient header options for serial or dma bus connections, external/internal and regulated/unregulated power options, and options for an internal or external Ethernet networking interface. Additional options include LEDs and a power backed-up real-time clock. The MSSLite Embedded Device Server allows OEM engineers to take advantage of the mature and robust Lantronix TCP/IP protocol stack that has been engineered over the last 10 years for all of Lantronix's server products. This software allows the MSSLite to facilitate direct uploads of data to a selected host or multiple selected hosts, handle polling or specific requests from networked hosts and provide management information to network requestors even while data transfers are in progress. Support for DHCP, TFTP, BOOTP, RARP, SNMP and telnet ensures easy and consistent interoperability in an IP networking environment. In addition, Lantronix's software makes it possible to run existing software on networked PCs that was previously limited to direct serial connections. This application transparency eliminates the need for OEM customers to develop costly new networked applications software. There are three MSSLite models, designated as MSSLite-A, MSSLite-B and MSSLite-C. The main differences between the models are their serial interfaces, power interfaces, LEDs, and the presence or absence of a real-time clock.
Power Connectors Power is normally supplied to the MSSLite by using one of the connectors mentioned in this section. However, Lantronix offers models that receive power through pins in the serial connectors. Power Jack (MSSLite-A & MSSLite-B) The MSSLite-A and MSSLite-B use a standard barrel power jack whose inner conductor is positive. Power requirements for the two models are different, however. Snapfit Power Header (MSSLite-C) The MSSLite C can receive power and ground via a 2-pin header located near the LEDs. Snapfit Power Connector
Ethernet Connector RJ45 Ethernet Connector Pinout
Serial Connectors The main difference between MSSLite models is the serial interface. All have an RS232 serial port, The connectors are explained in the following order:
DB25 Single (MSSLite-B) The MSSLite-B serial port is a DTE RS232 serial port. The default serial port settings are 9600 baud, 8 bits, no parity, and 1 stop bit. These settings can be customized. DB25 Serial Port Pinout (single)
IDC10 Serial Headers (MSSLite-C) The MSSLite-C has three 10-pin IDC headers on the bottom end of the board. Currently, only the DCE1 and DTE2 headers are usable. IDC10 Header Pinout Power Requirements MSSLite-C The MSSLite-C contains a small, highly-efficient 5V switching regulator, so there is a wide range of powering options. Because the switching regulator is roughly 80% efficient, heat issues are greatly diminished, meaning that the MSSLite-C is fully functional within the operating temperature limits over the entire input voltage range. Input Voltage +6.0 VDC min, +32.0 VDC max The minimum input voltage is set by the worst-case dropout voltage of the switching regulator at its maximum allowable junction temperature of 125° C and maximum output current of 300 mA. The dropout voltage in a switching regulator depends upon a number of factors, including FET resistance, inductor resistance, and maximum switch duty cycle. Adding these factors, the voltage at the power pins must never go below 6.0 V DC. The maximum input voltage is set by the voltage ratings of the power components of the MSSLite's switching regulator. If your application requires a higher input voltage than 32.0 Vdc, please contact Lantronix. Provisions for up to 60 Vdc can be made. Ripple Voltage (peak) 100 mV ptp @ 6Vin -> 3V @ 12 Vin The maximum ripple is set by the regulator drop-out and minimum voltage allowable as seen by the board circuitry. At 12V input, the ripple rejection is substantial. However, this ripple rejection is reduced as the supply voltage is dropped toward 6V (the instantaneous voltage at the input must not drop below 6.0V). For applications powered by unregulated supplies, remember that 60Hz is slow compared to microprocessor clocks, and the MSSLite built-in voltage monitor will reset the device if input voltage drops too low, even for a fraction of the 60Hz cycle. Operating Current 220 mA @ 6 Vin -> 110 mA @ 12 Vin typical MSSLite-B The MSSLite-B contains no 5V voltage regulator. You must supply the MSSLite-B with pre-regulated 5V power. Input Voltage +4.75 Vdc min, +5.25 Vdc max The minimum input voltage is set by the worst-case threshold of the MSSLite-B on-board voltage monitor. To prevent the MSSLite-B voltage monitor from triggering an unintentional reset, you must supply tightly-regulated (±3%) power to the unit (4.75 V minimum as seen at the power connector). The maximum input voltage is set by the voltage tolerance of the 5V ICs on the MSSLite-B and is therefore a hard limit. Do not supply greater than 5.25 Vdc to the MSSLite-B (as seen at the power pins) or you may damage the board. Ripple Voltage (peak) 100 mV ptp The maximum ripple is set by the minimum allowable input voltage. The input must remain above 4.75 V at all times. Remember that 60Hz is quite slow compared to microprocessor clocks, and the MSSLite built-in voltage monitor will reset the device if input voltage drops too low, even for a fraction of the 60Hz cycle. Operating Current 200 mA typical, 250 mA max Board Layouts MSSLite General Board Layout
The model-specific board diagrams that follow show the proper components and positioning for the different models. MSSLite-B
MSSLite-C
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