Changes between Version 34 and Version 35 of Hardware/jCM/dCM3/bHardware


Ignore:
Timestamp:
Jan 11, 2013, 1:44:35 AM (11 years ago)
Author:
Ilya Chigirev
Comment:

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  • Hardware/jCM/dCM3/bHardware

    v34 v35  
    11[[TOC(Hardware/cCM/cCM3/*, depth=3)]]
    22
    3  === Hardware Description ===
     3==== Hardware Description ====
    44
    55The 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
    7  ==== Major Hardware Components ====
     7==== Major Hardware Components ====
    88
    9  ===== Lantronix XPort AR =====
     9===== Lantronix XPort AR =====
     10
    1011[[Image(xport_ar.jpg)]]
    1112
    … …  
    3536More 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].
    3637
    37  ===== Voltage Monitor =====
     38===== Voltage Monitor =====
     39
    3840The 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.
    3941
    … …  
    4446[[Image(DS1780E.gif, 500px)]] [[Image(CM_Monitor.jpg, 500px)]]
    4547
    46  ===== RS232 Level Shifter =====
     48===== RS232 Level Shifter =====
     49
    4750The RS232 level (MAX3232) shifter takes the TTL compliant voltage levels from the Tx and Rx lines of the Xport AR and converts them to RS232 voltage standards (and vice versa). there is also 2 sets or resistors R15 & R16, and R17 & R18, which correspond to build in crossover or straight through signals. If R15 and R16 are installed then a straight cable is used to connect to the node serial port and if R17 and R18 are installed a null modem (or crossover) cable must be used. This is the sase for revision 4 of the CM3 board, the previous revision 3 had rotary switches rather than 0 ohm resistors. Also note that presently __the RTS and CTS signals have to be shorted manually on the 5x2 100mil header in order for serial redirection to work__. This was an oversight in the design and will be fixed in the next run.
    4851
    4952[[Image(CM_232_block.jpg, 350px)]][[Image(CM_232.jpg, 500px)]][[Image(CM_232_2.jpg, 350px)]]
    5053
    51  ===== Solid State Relays =====
     54===== Solid State Relays =====
     55
    5256There are two solid state relays (AQV201A) that act as an intermediary to simulate the button press corresponding to a reset and power button for the node motherboard. Important to note, is that the power and reset commands will not work is one of the two output sides of the relays is ties to power or ground, it must be a floating power/closed, and not shorting one pin to ground.
    5357