Rj48 To Serial Pins
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IBM RJ48 9-Pin Serial Cable NEW Bulk 21P3740 Product Information Item Weight 1 pounds Shipping Weight 1 pounds View shipping rates and policies Manufacturer.
RJ45 vs RJ48 Most people can easily identify between an RJ11 and an RJ45 wiring, and point out the differences and specific uses of each. But when it comes to.
Use this DB9 to RJ45 adapter, also called a rs232 to rj45 converter or simply a rj45 serial adapter, to convert any standard 9-pin DB port to a standard RJ45 port.
Tech Stuff - RS-232 Cables, Wiring and Pinouts. Like most folks we use the term DB9 which is widely - but erroneously - coined to describe a 9-pin serial connector.
RS232 - V.24/V.28 - IS2110 - X.20 bis for Async - X.21 bis for Sync
In this document the term RS232 will be used when refered to this serial interface. The
description of RS232 is an EIA/TIA norm and is identical to CCITT V.24/V.28, X.20bis/X.21bis and ISO IS2110. The only difference is that CCITT has split the interface into its electrical description V.28 and a
mechanical part V.24 or Asynchronous X.20 bis and Synchronous X.21 bis where the EIA/TIA describes everything under RS232.
As said before RS232 is a serial interface. It can be found in many different
applications where the most common ones are modems and Personal Computers. All pinning specifications are writen for the DTE side.
All DTE-DCE cables are straight through meaning the pins are connected one
on one. DTE-DTE and DCE-DCE cables are cross cables. To make a destiction between all different types of cables we have to use a naming convention.
DCE - DCE: Tail Circuit Cable Interface Mechanical
RS232 can be found on different connectors. There are special specifications for this. The CCITT
only defines a Sub-D 25 pins version where the EIA/TIA has two versions RS232C and RS232D which are resp. on a Sub-D25 and a RJ45. Next to this IBM has added a Sub-D 9 version which is
found an almost all Personal Computers and is described in TIA 457.
Transmit Signal Element Timing
Transmitter Signal Element Timing
Receiver Signal Element Timing
Local Loopback / Quality Detector
Secondary Received Line Signal Detector/
Data signal Rate Select DCE Source
All signals are measured in reference to a common ground, which is called the signal ground AB.
A positive voltage between 3 and 15 Vdc represents a logical 0 and a negative voltage between 3 and 15 Vdc represents a logical 1.
This switching between positive and negative is called bipolar. The zero state is not defined in RS232 and is considered a fault condition this happens when a device is turned off.
According to the above a maximum distance of 50 ft or 15 m. can be reached at a maximum speed of 20k bps. This is according to the official specifications, the distance can be exceeded with the
use of Line Drivers.Functional description
Also known as protective ground. This is the chassis ground connection between DTE and DCE.
The reference ground between a DTE and a DCE. Has the value 0 Vdc.
Originated by the DTE to initiate transmission by the DCE.
Send by the DCE as a reply on the RTS after a delay in ms, which gives the DCEs enough time to energize their circuits and synchronize on
Known as DSR. Originated by the DCE indicating that it is basically operating power on, and in functional mode.
Known as DTR. Originated by the DTE to instruct the DCE to setup a connection. Actually it means that the DTE is up and running and ready
A signal from the DCE to the DTE that there is an incomming call telephone is ringing. Only used on switched circuit connections.
Known as DCD. A signal send from DCE to its DTE to indicate that it has received a basic carrier signal from a remote DCE.
A control signal that can be used to change the transmission speed.
Timing signals used by the DTE for transmission, where the clock is originated by the DTE and the DCE is the slave.
Timing signals used by the DTE for transmission.
Timing signals used by the DTE when receiving data.
Originated by the DCE that changes state when the analog signal received from the remote DCE becomes marginal.
The secondary signals are used on some DCE s. Those units have the possibility to transmit and/or
receive on a secondary channel. Those secondary channels are mostly of a lower speed than the normal ones and are mainly used for administrative functions.
Here are some cable pinnings that might be useful. Not all applications are covered, it is just a help:
The connectors used for registered jack installations are primarily the modular connector and the 50-pin RJ48 is a registered jack. for serial computer.
RJ-48 Connector Pinouts For basic serial communications only TxD, Rxd, Pin 1. CTS. Pin 8. Pin 2. DSR. Pin 6. Pin 3. RxD. Pin 2. Pin 4. Gnd.
