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If you want to access all of the features on your computer#8217;s serial port, this serial adapter is for you. The adapter allows you to connect your 3-5.5V 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#8217;s perspective, so the TX pin has data transmitted by the computer that should be connected to your project#8217;s receive input.
Device specifications
PCB size: 1.30x1.22 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: 3ndash;5.5V
Maximum data rate: 250kbps
Supply current: 2mA
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 (3ndash;5.5V, externally supplied)
INV
Out
Serial port detection pin, high if serial port connected
TX
Out
Asynchronous serial data transmit, inverted (idle low)
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