Pololu 23201a Serial Adapter Fully Assembled

SKU: POLOLU-126 Brand: Pololu
This deluxe serial port adapter (RS-232 adapter) converts logic-level signals to the higher voltages required for RS-232 and similar serial ports. Unlike competing units, the Pololu serial adapter operates over a 3-5.5 V supply range and gives you access to all eight of the signal lines available on a DB9 connector, including five transmit lines and three receive lines.
$23.80 AUD, inc GST
$21.64 AUD, exc GST

In stock, ships same business day if ordered before 2PM
Delivered by Tue, 15th of Oct

Quantity Discounts:

  • 10-25 $20.99 (exc GST)
  • 25+ $20.55 (exc GST)
- +

1 from local stock, 1 supplier stock; your order will dispatch between Dec 1 to Dec 10. And yes, stock levels and lead times are accurate!

Shipping:

  • $7+ Standard (5+ days*, tracked)
  • $11+ Express (2+ days*, tracked)
  • FREE Pickup (Newcastle only - must order online*)

Shipping costs may increase for heavy products or large orders.

Exact shipping can be calculated on the view cart page.

*Conditions apply, see shipping tab below.

If you want to access all of the features on your computer’s serial port, this serial adapter is for you. The adapter allows you to connect your 3-5.5 V logic circuits to a COM port, which operates on higher and negative voltages (EIA-232, similar to the older RS-232 standard). The adapter is available fully assembled with male header pins facing down for use with prototyping boards and breadboards (as shown to the right), or as a partial kit. The partial kit offers more flexibility if you do not need all of the header pins or if you want to install them on the other side of the board (or not at all).

This adapter is effectively a carrier board for the MAX3238 from Texas Instruments. It distinguishes itself from most competing units through its five drivers and three receivers, which give you access to all eight signal lines on a DB9 connector (the ninth pin is ground). This means that in addition to standard serial communication, your project can also use all of the handshaking lines and status lines. Even if you do not use them for their intended purposes, you might find it convenient to be able to reset your processor using one of the extra lines. A connection detection line gives your project additional options for responding to a physical connection to a serial port. All of this connectivity comes in a compact package that is less than twice the size of the DB9 connector alone.

The first nine pins on the deluxe serial adapter correspond to the same nine pins on a COM port DB9 connector. The additional pins are the logic supply voltage, the serial connection detection pin, and an inverted version of the transmit line (which can be useful if, for instance, you have a positive-edge triggered interrupt that you want to fire in response to the beginning of the start bit). The TX line and RX lines are labeled from the computer’s perspective, so the TX pin has data transmitted by the computer that should be connected to your project’s receive input.

Device specifications

  • PCB size: 1.30" x 1.22" including connector
  • Serial standards: TIA/EIA-232-F and ITU v.28
  • # of drivers: 5
  • # of receivers: 3
  • Connector: DB9 female
  • Data I/O voltage levels: 3 – 5.5 V
  • Maximum data rate: 250 kbps
  • Supply current: 2 mA

Module pinout

Pin Type Function
DCD In "Data carrier detect"
RX In Asynchronous serial data receive
TX Out Asynchronous serial data transmit (idle high)
DTR Out "Data terminal ready" control output
(often used with DSR)
GND Power Ground
DSR In "Data set ready" control input
(often used with DTR)
RTS Out "Ready to send" control output
(often used with CTS)
CTS In "Clear to send" control input
(often used with RTS)
RI In "Ring indicator" control input
VCC Power Logic supply voltage (3 – 5.5 V, externally supplied)
INV  Out Serial port detection pin, high if serial port connected
TX  Out Asynchronous serial data transmit, inverted (idle low)

People often buy this product together with:

Pololu USB-to-Serial AdapterPololu USB-to-Serial Adapter

General specifications

Partial kit?: N

File downloads

Product Comments

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

  • $3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
  • $7+ for Standard Post (typically 6+ business days, tracked)
  • $11+ for Express Post (typically 2+ business days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $12+ for Pack and Track (3+ days, tracked)
  • $16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

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