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| Joined: | Saturday Mar 3rd, 2007 |
| Location: | Singapore |
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This is a connection cable between the UCM and another 3rd party serial device assuming that that device has a female DB9 connector just like the UCM Hence the UCM is connected to the 3rd party device via a Male to Male DB9 connection. Both UCM and the 3rd party device will Transmit data on pin 2 and Receive Data on Pin 3 (being DCE devices). This is why the pins 2 and 3 on both connectors must be crossed over (2 to 3 and 3 to 2) The monitoring cable which goes to the PC goes to Pin 2 of the FEMALE DB9 connector which plugs into the PC (which has a Male DB9). The PC being a DTE receives data on Pin 2 Hence the switch will connect the PC receive Pin to the transmit side of either the UCM or the 3rd party device
Check the diagram and the pinouts carefully (by reading the pin numbers on the back of the connector) as well as make sure the correct gender of the connectors is used, ie Male to UCM, Male to the 3rd party device and Female to the PC as shown in the diagram and check the cable itself fore short and open circuits
I am sure you will discover the error in the cable or connection
Last edited on Monday Apr 20th, 2009 04:46 am by admin
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