• Db9 Serial Port Pinout
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• Laptops With Serial Port Rs232
• Pc Serial Pinout
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• Pc Com Port Pinout

• Below is the RS232 connector pinout for testing computer serial port. Data and handshake lines connected. In this case, the sent data is immediately returned back and analyzed by the standard serial port verification software.
• Hp Serial Port Adapter; Hp Serial Port Adapter. For HP products, enter a serial number or product number. HP and Compaq Desktop PCs - Troubleshooting Serial and Parallel Ports. A USB to serial port adapter. Please help looking for db9 cable pin out for HP ProCurve. Please help looking for db9 cable pinout for HP ProCurve Switch 2524 J4813A.
• Jan 05, 2016 A DE-9 port is also called as a COM port and allows full duplex serial communication between the computer and it’s peripheral. Some of the applications of DE-9 port are serial interface with mouse, keyboard, modem, uninterruptible power supplies (UPS) and other external RS-232 compatible devices. The pinout diagram of DE-9 port is shown below.
• Note: Direction is DTE (Computer) relative DCE (Modem). Download Our RS232 Software Bundle Our software allows you monitor, log, debug and test any your RS232 or COM ports.

PC serial port is based on RS-232 standard, you may find signals details in the RS-232 interface pinout. RS-232, when compared to later interfaces such as RS-422, RS-485 and Ethernet, has lower transmission speed, short maximum cable length, large voltage swing, large standard connectors, no multipoint capability and limited multidrop capability.

To connect an LX200 to a computer you need a special cable. You can sometims buy one from the company that makes the software you’re using but it’s much cheaper to make one for yourself. The parts only cost a few dollars and it will take only a few minutes. All you need is a soldering iron, the appropriate connectors and the information below. It’s really a lot simpler that it looks.

Pin-outs

For those of you who know what you’re doing all you need to know is the pinouts:

Description	LX200	DIN-8	DB-9	DB-25	Name
+12v DC	1
Misc Serial Out	2
PC Transmit Data	3	3	3	2	TxD
Ground	4	4	5	7	Gnd
PC Receive Data	5	5	2	3	RxD
Misc Serial In	6

In the diagrams below the colors indicate which pins connect to each other.

LX200 RS232 Port

At right is a diagram of the LX200’s RS-232 port as you see it looking into the panel. Note the odd pin numbering: 1-4-2-5-3-6, read left to right looking into the port (This numbering is taken from the LX200 User’s Manual, don’t expect to see it elsewhere.)

At left is the corresponding 6-pin modular plug (RJ11) viewed from the flat side (top as it is inserted into the LX200; not the end); the connecting pins are on top, the tab on the bottom of the diagram represents the wire.

Mac Ports

The Macintosh’s modem and printer ports use a DIN-8 jack as shown at right looking into the Mac. The diagram at left shows the pins from the end of the male plug. Of course, it’s a mirror image of the diagram of the port. The pins are usually labeled in tiny raised letters.

Making a Simple Cable

Making a cable is just a matter of wiring up the connectors with matching colors as shown below. Connect pin 3 to pin 3, pin 4 to pin 4, and pin 5 to pin 5. (The exact correspondence of numbers is purely accidental.)

(Crossing lines do not connect)

Making a Dual Cable

Though they are labeled as “Unused” in the LX200 manual pins 2 and 6 are actually an extra RS232 port (pin 4 is a common ground). Thus you can make two simultaneous RS232 connections to your scope. This is useful if, for example, you want to connect to a computer and your CCD camera at the same time.

Connect one connector as above. For the other one, connect pin 6 to pin 3, pin 2 to pin 5, and the common ground pin 4 to pin 4.

Db9 Serial Port Pinout

(Crossing lines connect only where a dot is shown)

Other Computers

Cached

Other computers use a variety of different connectors. Most common are DB-25 (right, top) and DB-9 (bottom); they are shown here looking at the pins from the end of the male connector. Connect as for the Mac substituting per the pin-out table above.

Pin Nomenclature

The various RS232 pins go by a confusing variety of names. Fortunately for this purpose, we need only be concerned with three of them: Ground, RxD (receive data), and TxD (transmit data).

Laptops With Serial Port Rs232

The diagram at right shows how to connect a DIN-8 (top) to a DB-25 (below).

Richard Mathews says, “On the DIN-8, pins 5 and 8 are both Receive Data (actually RxD- and RxD+). The voltage difference between them is what matters. … To reduce noise, you should connect pin 8 to ground by tying it to pin 4. Note that your diagram for connecting a DIN-8 to a DB-25 already shows this connection, but you don’t show it in the info on connecting the RJ-11 to the DIN-8.” Richard is probably right but my cable works fine anyway.

USB

Modern computers have USB instead of serial ports. To use an LX200 with a USB computer you need a cable such as above plus a serial-USB adapter. I use a Keyspan USB Twin Serial Adapter; there are several other similar products available.

Disclaimer

Check your cable carefully before using it. A miswired cable could fry the RS232 ports on either end.

I have made a cable using this information. I have tried to make it correct. But I’m only human. If you burn up your LX200 it’s not my fault.

Pc Serial Pinout

Notes

• The cable can be very long (100ft or more) if you want. Use heavier gauge wire for longer lengths.
• It can be somewhat difficult to solder wires to the tiny pins on the backs of these connectors. The easy way to make an LX200-computer cable is to buy a cable with an 6-pin modular plug on one end and another cable with the proper connector (DB-9 or whathever) on one end. Then cut both wires in the middle and just solder the wires together. You may have to use a meter to verify which wire is which.
• If you want to avoid splicing wire, special tools for working with modular plugs are available
• You can actually use a 4-pin modular connector if you can’t find a 6-pin one. It will connect to the middle 4 pins of the jack. (But, of course, this won’t work for the dual cable.)
• Though the LX200’s port uses the same connector as your modem it will not work with a modem. Do not use a simple phone cord to connect your LX200 to a modem or to a phone line.
• Pin 1 of the LX200’s port is a 12vDC source. But don’t expect it to deliver much current.
• The LX200’s CCD port is just for moving the scope; it just runs the motors. Some CCD cameras can also use an RS232 port for fuller control of the LX200.
• You can buy all the parts and tools you need from any electronics supply outlet such as DigiKey or Newark.
• For info on LX200 cables see Information about Plugs and Cables by R. A. Greiner.
• Constructing an RS232 cable for a Magellan I by Alistair Symon (Alistair believes this will also work for a Magellan II)
• How to control the LX-200 from a handheld PC by Matt Considine
• Robert B. Denny’s nifty Astronomer’s Control Panel for the Meade LX-200 Telescopes
• Infogenie plugin for Starry Night
• If all this is too much hassle, you can buy ready-to-use cables from Charles Turner

See Full List On Pinoutguide.com

Credits

This page was made possible by the generous contributions of Don Dillinger, Michael Hart and others on the MAPUG mailing list (plus a little help from the LX200 manual, appendix F). I am grateful for their help but any mistakes are mine.

Pc Com Port Pinout

Bill Arnett; last updated: 2002 Feb 28