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RS-232 LED link Tester DB-9 Male to DB-9 Female

RS-232 LED link Tester DB-9 Male to DB-9 Female

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Manufacturer: CABLEMAX
Barcode: DB9-TERS
Part Number: DB9-TERS
Warranty: Lifetime
In Stock: Yes
Ship Weight: 1 lbs.
Size: DB9F/M

Item Works with MAC Operating System OS 9.1 or Higher
Item Works with Windows ME Item Works with Windows 2000
Item Works with Windows NT 4.0

Our Price: $19.98
Quantity Discount(s)
48 or more: $16.98
96 or more: $15.56
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Product Rating: ★★★★★

based on 33 review(s)

Product Description

The DB9 Tester is the easiest way for you to test the connection on any male or female 9 Pin Serial connections. This adapter allows you to monitor the status of your connections by marking them with LEDS, which flash when there is activity on the pins. This device is easy to install, it features a Plug & Play Easy test RS-232 Host to Device link.


  • RS-232 DB-9 / DB25 Pin assignment No Power required
  • Standard RS-232 DTE & DCE Interface with DB-9 / F & DB-9 / M Connectors
  • Easy to install , Plug & Play
  • Standard RS-232 Port
  • Fully compliant with RS-232 Spec.
  • Double colors LED for easy cheeking of data transfer & receive
  • Compact size
  • Fit display of RS-232 working
  • Works with Windows 7, 8, 10, Linux, Mac OS X


  • RS-232 DTE connector : DB9 - M
  • RS-232 DCE connector : DB9 - F
  • Data rate : Up to 200 K bps
  • With GND & Shell Test's LED
  • Single / TTL out 1 - LED appear Green (V-)
  • Single / TTL out 0 - LED appear Red (V+)
  • Housing : Plastic
  • Weight : 55g
  • Dimensions (L*W*H) : 45 * 35 * 21 ( mm ) body

Pin Out

  • DB - 9 / DB25 Pin assignment Pin1 / Pin8 : DCD <== IN
  • Pin2 / Pin3 : RXD <== IN
  • Pin3 / Pin2 : TXD ==> OUT
  • Pin4 / Pin20 : DTR ==> OUT
  • Pin5 / Pin7 : GND
  • Pin6 / Pin6 : DSR <== IN
  • Pin7 / Pin4 : RTS ==> OUT
  • Pin8 / Pin5 : CTS <== IN
  • Pin9 / Pin22 : RI <== IN
Important Technical Information:
RS-232 Tester DB-9 Male to DB-9 Female

RS-232 LED link Tester DB-9 Male to DB-9 Female

RS-232 LED link Tester DB-9 Male to DB-9 Female - Image A

Product Rating: ★★★★★ based on 33 reviews

See all customer Reviews

This is a great little device! As per the retention hex nut issue, this not a deal breaker. There are some excellent mods listed in the previous reviews. Or you can get a short serial cable on eBay for less than $2. Look for: RS232 DB9 9 Pin Male to Female Serial Port Cable Industrial Adapter 1.3M. Since this cable has thumb screws on both ends, it will act as an adapter.
October 24, 2016
It does what it says it does and does it well. The LEDs give you a very clear indication of what's going on inside your serial cable. Only caveat is that this is designed to be a pass-through device (one side is male, one female) but both sides have the "female" retention screw holes. This means you can't plug it directly into pretty much anything, because pretty much all computer and even device serial ports also have the female screw holes. If you take the screw holes off with a hex driver, the metal shielding comes with them, so you end up with an unshielded connection. Your choice is either deal with that or get two M->F cables where both ends have the screw threads and put this in the middle. I ended up using a little Krazy Glue to glue the metal shield to the plastic casing, but without the screw holes it's probably not even doing anything anyway. Just a heads up - you may have to do a little hacking, or get extra cables with the correct ends, to get this to attach to anything.
Flint Million
April 29, 2016
jose luis ayala
March 21, 2016
just using it for GPS signal but works great for that.
Stacy Unruh
February 18, 2016