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Summary of Contents for SMSC PCM-2074
- Page 1 PCM-2074 EVB User Manual USER MANUAL SMSC PCM-2074 Revision 1.0 (03-31-06)
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Page 2: General Description
Note: The RJ-11 jacks are not configured to support the CircLink Hub function. The software driver supplied with the PCM-2074 supports Windows 2000 and Windows XP and comes with a support library. Note: Please download the latest version of the driver from SMSC’s website, along with the latest version of this manual and other application notes relating to SMSC’s CircLink... -
Page 3: Connectors And Leds
PCM-2074 EVB User Manual 2 Connectors and LEDs The photograph below shows important features of the Main Board of the PCM-2074. Figure 2.1 The PCM-2074 Main Board USER MANUAL SMSC PCM-2074 Revision 1.0 (03-31-06) - Page 4 PCM-2074 EVB User Manual Table 2.1 Table of Connectors and LEDs for the PCM-2074 Main Board DESIGNATOR SILKSCREEN DESCRIPTION 14-pin right-angle connector, attaches to CN1 of the RS485 Board via a flat ribbon cable Through-holes for mounting a connector for the GPIO signals LED turns on when the host card is accessed via the PCMCIA interface Table 2.2 Table of Connectors and LEDs for the PCM-2074 RS485 Board...
- Page 5 PCM-2074 EVB User Manual 3 EVB Configuration (Jumper Settings) The illustrations below shows the location of jumpers and switches on the two boards. Note: CN2 and SW1 on the Main Board are not populated. Figure 3.1 Location of Jumpers and Switches on the Main Board Figure 3.2 Location of Jumpers and Switches on the RS485 Board...
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Page 6: User Manual
No Hub No Hub SW1-1 nCMIBYP Selects CMI or RZ mode Note: The Hub function is not used on the PCM-2074; SW1-2 should always be set in the default position. Table 3.4 JP1, JP2 (RS485 Board) Configuration Settings POS. NAME... -
Page 7: I/O Connectors
PCM-2074 EVB User Manual 4 I/O Connectors The Main Board has two connectors - CN1 and CN2 - to allow for input/output signals. CN1 comes mounted with a 14-pin connector, which is used to attach the RS485 Board using a ribbon cable. CN2, which has no connector attached, can be used for an optional GPIO (General Input/Output) connector. -
Page 8: Mechanical Specifications
PCM-2074 EVB User Manual 5 Reset The Main Board provides a power-on reset signal which is driven by an MB3771 integrated circuit. This circuit asserts the power-on reset signal when the Main Board is inserted into a PCMCIA slot, or when the PC it is attached to is powered on. -
Page 9: Operating Conditions
9 Connecting Twisted Pair Cables to the RJ11 Connectors The PCM-2074 provides two modular RJ11 jacks for connection to twisted pair cables, which need to be supplied by the user. These cables should have a characteristic impedance of 125 ohms, in order to match the impedance built into the board. -
Page 10: Point-To-Point Connection
PCM-2074 EVB User Manual Point-to-point Connection Connect two evaluation boards as shown below. Attach a termination resistor to both ends. Evaluation Board 1 Evaluation Board 1 Offset Resistors: Offset Resistors: Connected Connected Termination Termination Resistor Resistor Twisted Pair Cable Figure 9.1 Point-to-Point Twisted Pair Connection Bus Connection Connect three or more EVBs as shown below. - Page 11 The offset resistors should be installed on the end nodes of a network and should be removed or disabled on the middle nodes of a network containing three or more nodes. This is shown in Figure 9.3 below. (In the PCM-2074, the offset resistors are configured using JP1 and JP2.). Transmission line: positive Transmission line: negative...
- Page 12 PCM-2074 EVB User Manual 9.3.1 Calculating the Value of the Offset Resistors The discussion explains how the Offset Resistor values are calculated, and refers to Figure 9.4. The transmission line side is in an open, or floating state. RS485 Receiver portion Figure 9.4 Offset Resistor Value Calculation...
- Page 13 PCM-2074 EVB User Manual RJ11 Pin Out 6 Pin Type 4 Pin Type Pin Number Polarity Figure 9.5 Pin Out of an RJ-11 Modular Jack (Front View) As shown in the figure above, only the two middle pins are used regardless of the number of pins available.
- Page 14 11 Using the PCM-2074 with a Desktop PC To use the PCM-2074 evaluation board in the PCI slot of a desktop PC, please use a general-purpose conversion adaptor between the PCI slot and the PCM-2074 PCMCIA connector, such as the P111 from Elan Digital Systems (website: www.elandigitalsystems.com).
- Page 15 1. For proper operation, environmental and power supply limitation requirements must be adhered to. 2. Do not expose the PCM-2074 to chemicals or to liquids, such as water or oil, or to moisture or vapor during handling or storage. Such exposure may result in electrical shock, short circuits, damage to the PCM-2074, or fire.
- Page 16 Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer.
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