<![CDATA[Patton Electronics Co.]]> <![CDATA[How to check if Microsoft's USB fix is installed on my computer? ]]>
 You can check whether the Microsoft fix was installed through: · 'My Computer' - 'Properties' - 'Hardware' - 'Device Manager' - 'Universal-Serial-Bus-Controller' - choose one of the controllers and select 'Properties' - 'Driver' - 'Driver Details'. · The correct fix is: usbuhci.sys version is 5.1.2600.14. · The incorrect fix is: usbuhci.sys version is 5.1.2600.0. · Note: If WinXP is installed with SP1 the usbuhci.sys version should be: 5.1.2600.1038.  
]]> <![CDATA[What services do I need from my phone company to use modem on hol...]]>

Modem On Hold: Allows you to receive incoming calls while keeping your Internet connection on hold. Note: you need to have the "call waiting" feature enabled on your phone line. Your phone company can arrange to have this installed, if not currently available.

Outgoing Calls: Allows you to make outgoing calls while keeping your Internet connection on hold. Note: You need to have the "three-way call" feature on your phone line. Your phone company can arrange to have this installed, if not currently available.

]]> <![CDATA[What do I do if I have a USB modem on WinXP and the modem frequen...]]>
 Frequent disconnection on a USB modem running on WinXP may be easily corrected by installing a fix from Microsoft that can be downloaded from: http://support.microsoft.com/default.aspx?scid=kb;EN-US;q307271  
]]> <![CDATA[Two Wire Operation of Models 1004A, 1009, 2085 and 2089?]]>  For Half-Duplex 2-wire operation, Please confirm that the communications program being used by the computers controls Request To Send (RTS). This is very important, when a Converter detects an ON (+ voltage) for RTS the transmitter is switched from HIGH IMPEDANCE to LOW IMPEDANCE. If two or more Computers have RTS - ON the line will be clamped and there will be NO TRANSMISSION possible. The Converters operates HALF-DUPLEX only when they are configured for 2-wire operation. For Half-Duplex operation all Computers must have RTS-OFF, a negative voltage for RTS. Typical Half Duplex communications will function as follows : A Master unit will Poll with addresses of slave units. The Master unit turns ON RTS sends the address of a slave unit, then turn RTS OFF. The Slave unit receives it’s address, turns ON RTS sends the information then turns OFF RTS. Please use the following configuration switch settings for 2-wire operation of the Model 1004A and 2085 S1-1, 2, 3 and 4 OFF S1-5 ON for RTS control S1-6 one unit ON the other OFF S1-7, and 8 ON for 2-wire operation. Please use the following configuration switch settings for 2-wire operation of the Model 1008 and 2089 S1-1, 2 and 3 ON S1-4 OFF S2-1 and 2 ON S2-3 and 4 OFF The 2-wire twisted pair circuit should be connected: XMT+ ---- XMT+ XMT- ---- XMT- ]]> <![CDATA[What is the meaning of DCE (data communication equipment) and DTE...]]>  DCE Data Communications Equipment, is typically a Modem or other device that connects to a Network. DTE Data Terminal Equipment, is typically a Computer.]]> <![CDATA[What is the different between wired as DCE and DTE? ]]>  DCE and DTE reference is used to identify the source or origination of signals. A local DTE (PC) connects to a DCE (Modem), the Modem connects to a Network, the remote end of the Network has a second Modem used to connect to the remote PC.]]> <![CDATA[How should two DCE devices be connected?]]>  A Null Modem is used to connect the one DCE device to another. A Null Modem crossover connects the Receive and Transmit Data and the Control Signals.]]> <![CDATA[What pin-out should be used to connect DCE to DTE?]]>  The cable should be connected straight through.]]> <![CDATA[How can the distance limitations on any unit be extended?]]> Distance limitations on any unit that operates in pairs can be extended using a tail circuit. This involves using two pairs of the unit daisy-chained together through the DTE Interface. However, since the units are both DCE, a crossover cable must be used. We have run tests on some units using 3 repeaters which extended the distance 4 times the original.]]> <![CDATA[Why won't my RS485 or RS422 device work properly, and which signa...]]>
 There is confusion regarding the polarity of the RS485 and RS422 transmit and receive signal pairs. The RS-485 and RS-422 specifications define the transmit and receive signal pairs as XMT-A, XMT-B, RCV-A, and RCV-B. Unfortunately most manufacturers have ARBITRARILY assigned XMT-A as either XMT+ or XMT-. Similarly for the RCV signal pair. The specification never defines the A and B signals as either negative or positive. They only state that in the mark condition, XMT-A is more negative than XMT-B. This is only a relative definition.
What does this mean? You might want to swap the polarity if your application does not function properly. If the other RS485 or RS422 device
does use -A and -B for the polarity identification, note that the Patton signals correspond as follows:
XMT+ -----> XMT-A
XMT- -----> XMT-B
RCV- -----> RCV-B
RCV+ -----> RCV-A.
This only applies if the remote end is not the same as the local end. If you are using any of these converters on both ends: 2089, 2085, 222N, 222N9, 2084, 2086, and their corresponding rack cards, this does NOT apply.
]]> <![CDATA[What's required for a Short Range Multipoint Modem to operate Two...]]>  First of all, the communication equipment must control Request To Send (RTS). This is very important, when a modem detects an ON (+ voltage) on Pin 4 (RTS) it switches the transmitter from High Impedance to Low Impedance. If two or more pieces of equipment have RTS - ON, the line will be clamped and there will be no transmission possible. These modems operate in Half-Duplex only when they are configured for Multi-Point operation. For Half-Duplex operation all equipment must have RTS-OFF, a negative voltage on Pin 4 of the RS-232/V.24 serial port. Typical Half Duplex communications will function as follows:

A Master unit will Poll with addresses of slave units. The Master unit turns ON RTS sends the address of a slave unit, turn RTS OFF. The Slave unit receives it's address, turns ON RTS sends the information then turns OFF RTS.

]]> <![CDATA[ Why doesn't my Short Range Modem work with a Laptop?]]>
 The problem is the P/C AC power source has only two wires are connected: +/- DC, no earth ground. In this case voltages of 75 to 85VAC between the P/C chassis (Signal Ground) and Earth can be found. Grounding the P/C chassis fixed the problem.
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