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6ft. DB-9 Female to DB-9 Female Null Modem Cable Black




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 360319...Null Modem Cable..$2.95  

 

 

Manufacturer: CABLEMAX
Barcode: CAB-18999
Part Number: CAB-18999
Warranty: One Year
In Stock: Yes
Ship Weight: 1 lbs.
COLOR Black
Size: 6ft
Platform:  ITEM DESIGNED and Tested with SYSTEM ITEM DESIGNED FOR MAC OPERATING SYSTEM ITEM DESIGNED FOR WINDOWS OPERATING SYSTEM
Compatability: ITEM DESIGNED and Tested with SYSTEM

Item Works with MAC Operating System OS 9.1 or Higher Item Works with Windows 98Second Edition Item Works with Windows ME Item Works with Windows 2000 Item Works with Windows XP Item Works with Windows NT 4.0 Item Works with MAC Operating System OS 9.1 or Higher Item Works with LINUX Operating System

Our Price: $3.98
Qty:
Quantity Discount(s)
Quantity Discount: 48 + $2.98 96 + $2.56
AVAILABLE TO SHIP SAME DAY!
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Pros: Easy installation, Works with Vista and Windows 7.

Product Description


DB9 female to DB9 female, 7 conductors, shielded, molded

The purpose of a null-modem cable is to permit two RS-232 DTE devices to communicate with each other without modems or other communication devices (i.e., "DCE"s) between them.

To achieve this, the most obvious connection is that the TD signal of one device must be connected to the RD input of the other device (and vice versa).

Also, however, many DTE devices use other RS-232 pins for out-of-band (i.e.,hardware) flow control. One of the most common schemes is for the DTE (the PC) to assert the RTS signal if it is ready to receive data (yes, it DOES sound backwards, but thats how it works), and for the DCE (the modem) to assert CTS when it is able to accept data. By connecting the RTS pin of one DTE to the CTS pin of the other DTE, we can simulate this handshake.

Also, it is common convention for many DTE devices to assert the DTR signal when they are powered on, and for many DCE devices to assert the DSR signal when they are powered on, and to assert the CD signal when they are connected. By connecting the DTR signal of one DTE to both the CD and DSR inputs of the other DTE (and vice versa), we are able to trick each DTE into thinking that it is connected to a DCE that is powered up and online. As a general rule, the Ring Indicate (RI) signal is not passed through a null-modem connection.

Receive Data 2 3 Transmit Data

Transmit Data 3 2 Receive Data

Data Terminal Ready 4 6+1 Data Set Ready + Carrier Detect

System Ground 5 5 System Ground

Data Set Ready + Carrier Detect 6+1 4 Data Terminal Ready

Request to Send 7 8 Clear to Send

Clear to Send 8 7 Request to Send

Important Technical Information:
DB9 female to female null modem cables. A null modem cable allows two computers to communicate without a modem. It allows you to connect your PC to another nearby PC or serial device using its modem protocol. The transmit and receive signals are crossed.



6ft. DB-9 Female to DB-9 Female Null Modem Cable Black

6ft. DB-9 Female to DB-9 Female Null Modem Cable Black Only $3.98  at USBGear.com


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