Name: Monoprice DB9 M/M Null Modem Mini Type
Brand: Monoprice
Price: 1.99 USD
Availability: InStock
Rating: 5 (10 reviews)

Monoprice DB9, M/M, Null Modem Mini Type - main image

Monoprice DB9, M/M, Null Modem Mini Type

Product # 1202

UPC # 844660012023

$1.99

*Affirm is not available for business or international orders

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I'm not sure if this is what I need. I have a connecting cable to connect my cash register to my laptop. But it ends in a female 9pin serial connector - which is what my laptop is too. Do I need this null modem adapter or a "gender changer" to connect the cable to the laptop and have the pin assignments right?

David B on Jun 12, 2017

BEST ANSWER: Thank you for your question. Null modem will have a crossover of the 2 and 3 pin where the gender changer will be wired straight. I would recommend reaching out to the manufacturer of your cash register or referencing the user manual regarding the type of connection it will require.

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Inaccurate
Mark P Staff on Jun 23, 2017

Review More Purchases | My Posts

5.0 / 5.0

10 Reviews

5 Stars

4 Stars

3 Stars

2 Stars

1 Star

Rated 5 out of 5

Does what it says

Good quality mini null modem adapter, avoids huge adapter chain, reduces port strain.

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September 13, 2021

Jonathan C

Purchased
1 year ago

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Rated 5 out of 5

Still Works

Its a simple and old design. What could go wrong? I connected it and found myself able to do what I needed to do over a serial line.

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February 1, 2021

Richard R

Purchased
over 2 years ago

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Rated 5 out of 5

Short ans sweet

I prefer to us null-modem adaptor female-female but sometimes with cables already in place, it's practical to have such a null-modem adaptor male-male.

Here is the pinout of it, that I've just probed prior to do this review:
1 goes to 4
2 goes to 3
3 goes to 2
4 goes to 1 and 6
5 goes to 5
6 goes to 4
7 goes to 8
8 goes to 7
9 is not there, on both sides

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February 25, 2018

Denis B

Purchased
over 5 years ago

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Rated 5 out of 5

Excellent null modem

These work great, use them for work they are nice and compact and well made.

Also great that they are male to male, also great on the end of a standard serial cable to make it a null modem cable for programming equipment

PROS: Size

Quality

Male to male gender changer

CONS: None

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January 6, 2015

Guest

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Rated 5 out of 5

Tiny cable converter

This simple and small device reverses the necessary pins to convert DB9 into a null modem cable. Does the job as expected and required.

PROS: Small and solid construction

CONS: none observed

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March 15, 2014

Spyder

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Rated 5 out of 5

Works

Works

PROS: Works

CONS: None

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August 22, 2013

2WYCE

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Rated 5 out of 5

Perfect for converting a null-modem cable back to a straight-through

Title says it all

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December 5, 2012

a test guy

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Rated 5 out of 5

Supervisor, Tech. Delivered Services

Product recieved quickly and worked great! Thanks again for product.

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April 19, 2010

Sgt PW Markum

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Rated 5 out of 5

Excellent adapter at a good price

I use these adapters as part of a receiver control package. They are a very good quality adapter, small in size and I have used many without any problems.