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The current version of the standard is TIA-232-F Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange, issued in 1997. The RS-232 standard had been commonly used in computer serial ports and is still widely used in industrial communication devices.
Today, the DB9 has mostly been replaced by more modern interfaces such as USB, PS/2, Firewire, and others. However, there are still many legacy devices that use the DB9 interface for serial communication. What does L-com carry for DB9 Connectors? L-com has a huge variety of DB9 products, including DB9 connectors, DB9 adapters, and DB9 cables. Nov 13, 2018 An asynchronous port on the computer used to connect a serial device to the computer and capable of transmitting one bit at a time. Serial ports are typically identified on IBM compatible computers as COM (communications) ports. Serial flow is a stream of bits over a single wire (such as on the transmit or receive pin of the serial connector). For the serial port to create such a flow, it must convert data from parallel (inside the computer) to serial on the transmit pin (and conversely). The RS-232 / V24 serial interface communications standard was widely used for many years. It is still used in some instances, especially in existing installations, although its use is now decreasing as Ethernet and other standards take its place. RS232 / V24 was found in many areas from computers to remote terminals and many more.
ULINKplus User's Guide
IntroductionHardware DescriptionDebug and TraceJTAG/SWD InterfaceULINK SWD AdapterConnect to TargetDebugDebug SettingsApplication DebugPack SettingsTraceClock MeasurementFlash ProgrammingConfigure Flash DownloadFlash DownloadUser Flash AlgorithmsPower MeasurementTest AutomationµVision WindowsTroubleshootingAppendix The ULINKplus supports an isolated JTAG/SWD interface using a low-cost 10-pin (0.05') connector.
Technical characteristics
Interface | Description |
---|---|
JTAG/SWD | Voltage range: 1.2 V .. 5.5 V Clock speed: configurable up to 10 MHz SWO trace capturing: data rate up to 50 Mbit/s (UART/NRZ Mode) Isolation: 1 kV Supports hot-plugging to a running target |
Interface Schematic
The target interface schematic shows the JTAG and Serial Wire interface circuits of ULINKplus. All pins are 1kV isolated and support hot-plugging while the target is running.
Use this schematic to help with board design, and for analyzing and debugging your target hardware.
JTAG/SWD Connector
The 10-pin, 0.05' JTAG/SWD connector offers ITM and DWT trace information. In SWD mode, two pins are used for debugging: one bi-directional pin (SWDIO) transfers the information and the second pin (SWDCLK) clocks the data. A third pin (SWO) delivers the trace data at minimum system cost. The Serial Wire and JTAG pins are shared.
Note
- KEY (position 7) has no pin and serves only as a key to properly orient the connector.
- VCC (pin 1) provides the supply voltage for the JTAG/SWD I/O driver and is required as ULINKplus has isolated connection.
- The 10-pin connector is a Samtec 10-pin: FTSH-105-01-L-DV-007-K connector with pin 7 removed. It's dimensions are: 0.25' x 0.188' (6.35mm x 4.78mm).
JTAG and Serial Wire Signals
Because the 10-pin JTAG/SWD connector supports both JTAG and Serial Wire signals, you can configure the debugger for either JTAG or Serial Wire mode to suit your Cortex device.
JTAG Signals
Signal | Connects to... |
---|---|
TMS | Test Mode State pin -- Use 100K Ohm pull-up resistor to VCC. |
TDO | Test Data Out pin. |
TDI | Test Data In pin -- Use 100K Ohm pull-up resistor to VCC. |
TCLK | Test CLocK pin -- Use 100K Ohm pull-down resistor to GND. |
VCC | Positive Supply Voltage -- Power supply for JTAG interface drivers. |
GND | Digital ground. |
RESET | RSTIN/ pin -- Connect this pin to the (active low) reset input of the target CPU. |
Serial Wire Signals
The Serial Wire mode differs to JTAG debugging, because only two pins are used for the communication. A third pin can be used optionally to trace data. JTAG pins and SW pins are shared.
- TCLK is SWCLK (Serial Wire Clock)
- TMS is SWDIO (Serial Wire debug Data Input/Output)
- TDO is SWO (Serial Wire trace Output)
Signal | Connects to... |
---|---|
SWDIO | Data I/O pin -- Use 100K Ohm pull-up resistor to VCC. |
SWO | Optional trace output pin. |
SWCLK | Clock pin -- Use 100K Ohm pull-down resistor to GND. |
VCC | Positive Supply Voltage -- Power supply for JTAG interface drivers. |
GND | Digital ground. |
RESET | RSTIN/ pin -- Connect this pin to the (active low) reset input of the target CPU. |
Serial Port Connector Cable
Note
Serial Ata Interface Connector
- Usually, devices do not include pull-up or pull-down resistors on JTAG nor SW pins. Resistors should be added externally onto the board. However, do not add resistors when the device includes them already.
Serial Connector To Usb
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