Changes between Version 18 and Version 19 of Hardware/jCM/dCM3/bHardware


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Timestamp:
Jun 14, 2011, 2:53:33 PM (9 years ago)
Author:
Ilya Chigirev
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  • Hardware/jCM/dCM3/bHardware

    v18 v19  
    33 == Hardware Description ==
    44
    5 The new chassis manager uses a completely new set of hardware compared to the older revisions. The design is based around the Lantronix XPort AR module, along with accompanying external hardware for interface to the node. The SDK for this device allows the implementation of custom code which is used to interface and understand CMC instructions.
     5The new chassis manager uses a completely new set of hardware compared to the older revisions. The design is based around the Lantronix XPort AR module, along with accompanying external hardware for interface to the node. The SDK for this device allows the implementation of custom code which is used to interface and understand CMC instructions. A full schematic of the CM3 is attached as a PDF to this page.
    66
    77 === Major Hardware Components ===
     
    99 ==== Lantronix XPort AR ====
    1010[[Image(xport_ar.jpg)]]
     11
    1112The Xport AR is an embedded device server, produced by Lantronix. It runs off of the [http://www.lantronix.com/device-networking/utilities-tools/evolution.html Evolution OS®], combined with the custom software written using the Xport AR SDK. The Xport AR acts as the 'brains' of the CM3, handling all the networking tasks, as well the link between the CMC instruction commands, and the physical interface to the node. It has the following basic features:
    1213||                              '''Architecture'''                                  ||
     
    3031The GPIOs are used to control the solid state relays used to power the node on/off and reset the node, as well as monitor the 'hardware status', see the next section for details on this.
    3132
     33[[Image(CM_Xport.jpg, 600px)]]
     34
    3235More information on the Xport AR can be found [http://www.lantronix.com/device-networking/embedded-device-servers/xport-ar.html here], and documentation on the device can be found [http://www.lantronix.com/support/downloads/?p=XPORTAR here].
    3336
    3437 ==== Voltage Monitor ====
    35 The CM3 has a PC voltage monitoring chip installed, the DS1780E+. This chip monitors the +5V, +12V, and temperature of the air in the case. The voltage levels are taken from the floppy connector (J2) which feed directly into the chip and communicates that information over I²C to the Xport AR. '''However''' the I²C is not active on the Xport AR, and so there is no way to effectively get accurate voltage and temperature data about the node.
     38The CM3 has a PC voltage monitoring chip installed, the DS1780E. This chip monitors the +5V, +12V, and temperature of the air in the case. The voltage levels are taken from the floppy connector (J2) which feed directly into the chip and communicates that information over I²C to the Xport AR. '''However''' the I²C is not active on the Xport AR, and so there is no way to effectively get accurate voltage and temperature data about the node.
    3639
    3740The 'status' (i.e. on or off) of the node depends on the voltage levels of the power supply (PS), so as a work around for the lack of I²C support the current hardware version of the CM3 has the 5V line feed directly into one of the GPIO (set as an input) and if that is high the PS is on, and so the node is also on. Hopefully I²C will get some support in the future from Lantronix. Presently R4 and R14 is installed and R8 is left open. If I²C is to be implemented then R4 and R14 would have to be removed by hand, and R8 installed.
     41
     42The functional block diagram and schematic implementation of the DS1780E are presented here:
     43
     44[[Image(DS1780E.gif), 600px]]
     45
     46[[Image(CM_Monitor.jpg), 600px]]
    3847
    3948 ==== RS232 Level Shifter ====