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Building Custom Cables 1

Building Custom Cables

This section contains cabling information and how to build your own

custom cables for RocketPort controllers. To go to any of the following

topics, merely click on the topic:

• Building Custom Cables

• Shielding Cables

• Using Modular Connectors

• DTE to DCE Straight-Through Cables

• DTE to DTE Null-Modem Cables

• DTE to DTE Data-Only Null Modem Cables

• DTE to DTE Control Loop-Back Cables

• RS-422 DTE to DTE Cables

• Pinouts for DB25 Connectors

• Pinouts for DB9 Connectors

• Pinouts for RJ45 Connectors

• Pinouts for RJ11 Connectors

Building Custom Cables

Use this subsection if you want to build customized cables for the

Comtrol RocketPort controllers.

Usually you can buy the correct cables from distributors and electronics

stores for your controller. In some cases, your peripheral equipment

may need custom cables.

Check your equipment to understand what kind of cable to use, Data

Terminal Equipment (DTE) or Data Communications Equipment

(DCE). All Comtrol serial connectors are configured as DTE.

Summary of content (7 pages)

PAGE 1
Building Custom Cables This section contains cabling information and how to build your own custom cables for RocketPort controllers.
PAGE 2
Building Custom Cables Shielding Cables The controller falls within the limits for a Class A computing device established by the FCC. To comply with these limits, the serial cables used to connect the controller to external devices should be shielded. The shield should be connected to a metal or metallized connector shroud on each end of the cable. Using Modular Connectors The RJ45 and RJ11 connector is similar to the phone-jack type of connector.
PAGE 3
Building Custom Cables RocketPort Connector Remote Connector Signal DB25 RJ45 RJ11 DB9 Name Pins Pins Pins Pins TxD 2 4 3 3 RxD 3 5 4 2 RTS 4 1 N/A 7 CTS 5 8 N/A 8 DSR 6 7 N/A 6 DCD 8 6 5 1 DTR 20 2 1 4 GND 7 3 2 5 DB9 DB25 Signal Pins Pins 2 3 3 2 8 5 7 4 4 20 1 8 6 6 5 7 Name RxD TxD CTS RTS DTR DCD DSR GND DTE to DTE Data-Only Null Modem Cables If no hardware flow is needed, use the following figure. With a 3-wire cable, software flow control must be used, if control is needed.
PAGE 4
Building Custom Cables RS-422 DTE to DTE Cables Most RS-422 communication links usually do not use hardware handshaking or signal ground lines. The following figure shows twisted-pair transmission lines that work in most cases.
PAGE 5
Building Custom Cables Table 1. DB25 Connector Pinouts (Continued) Pin RS-232 Signal RS-422 Signal 20 DTR Not used* 21 through 24 Not used Not used 25 Not used T x D- * All RS-232 signals are present in RS-422 mode. DB25 Female Pin 13 Pin 25 DB25 Male Pin 1 Pin 1 Pin 14 Pin 14 Pin 13 Pin 25 Pinouts for DB9 Connectors Use the following table and figure for pinout information for the DB9 connectors on the Quad/Octacable. Table 2.
PAGE 6
Building Custom Cables Pinouts for RJ45 Connectors Use the following table and figure for pinout information for the RJ45 connectors on the RocketPort 4J. 4J/RJ45 1 8 Plug Top View Pin 1 Cable Pin 1 Receptacle Table 3.
PAGE 7
Building Custom Cables Pinouts for RJ11 Connectors Use the following table and figure for pinout information for the RJ11 connectors on the RocketPort 8J. 8J/RJ11 1 6 Plug Top View Cable Pin 1 Pin 1 Receptacle Table 4.