Learn More! All Rights Reserved. View All. Hello, guest Please sign in or create an account. Site Search:. Shop Products. Live Chat Tech Support. Browse Serial RS Refine by…. Computer Cables. Serial RS DB25 Null Modem Cables 3. Length ft. DB25 Female 1. DB25 Male 8. DB9 Female Crossing the data transmission lines in straight-through serial cables, this adapter will connect two RS serial ports.
Product Certifications Tap an icon to learn more:. Customer Reviews. It does not have pins 4 and 20 together. That adapter would be a custom request. Answered by: Steve. Distributors Ingram Micro Part : H Synnex Part : CTG Tech Data Corporation Part : E-Mail Twitter Facebook.
Item added to cart. Keep Shopping. View Cart. There is, as far as we know, no standard to cover the use of cat5, cat5 e or cat 6 8 conductor wiring when used with two DB9 connectors. Any such wiring scheme is therefore non-standard - that includes the wiring scheme below. Specifically this means that both ends of the cable must be wired in the same way and that no assumptions can be made about how the other end is wired.
You will have to manually inspect both ends of the connection. Damage can result from mis-matched wiring. A DB9 clearly has 9 connections and a cat5, cat5 e and cat 6 cable has 8 conductors.
We have chosen to use a minor variation on the normal DB9 Null modem pinout above - specifically we have allowed for RI which could be used from a peer PC to commence a transmission sequence. The colors used are unimportant but the suggested configuration is one way to provide the shortest use of the adjacent twisted pairs. Use when connecting a DB9 e. See the full signal names in the DB9 and DB25 section. See the full signal names in the DB9 and DB25 sections.
When used with RS unbalanced the B - are tied to a common ground. The pinout supports both synchronous V. Not connected. RS allows only one master or transmitter all others are only receivers. The following pinout is widely used by many manufacturers but you are advised to verify with the manufacturer's specifications before proceeding.
The original V. Most modern systems that call themselves V. The signal names used in the pinout below refer to the standard original V. Any errors in this list are ours not Rob's. D - pin connector - a little longer than C, but three rows using the same pins as the 2-row connectors. T1 is a North America primarily digital service providing 1. CATegory 5 e cabling is used to provide balanced pairs.
The color coding for Cat 5 e cabling may be A or B. Problems, comments, suggestions, corrections including broken links or something to add? Please take the time from a busy life to 'mail us' at top of screen , the webmaster below or info-support at zytrax. You will have a warm inner glow for the rest of the day. If you are happy it's OK - but your browser is giving a less than optimal experience on our site. You could, at no charge, upgrade to a W3C standards compliant browser such as Firefox.
Page Standards. Pin No. Only needed if second channel being used. Synchronous use only. DCE Modem raises when incoming call detected used for auto answer applications. Secondary Channel only. Raised by DCE when modem synchronized. Arriving data from DCE. Sending data from DTE. Raised by DTE when powered on. Raised by DCE to indicate ready. Raised by DTE when it wishes to send. Set when incoming ring detected - used for auto-answer application. RS DB9 and DB25 Loopback Pinout Loopback is a method of testing the RS connector and interface circuitry to ensure it is functioning correctly, that is, in layman's jargon - it ain't broke!
In balanced mode signals with the same name are the paired set, for example, pins 2 and 14 are both named BA and form the Transmit Data pair. A - pin 2-row joystick connector.
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