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Industrial Port-Powered RS232 to TTL 5V Converter

Model: TTL-232-1

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The TTL-232-1 is an industrial-grade (wide temperature range with surge & static protection) port-powered bi-directional RS232 to TTL converter, which can be used to convert RS232 to 5V TTL/CMOS compatible levels and vice versa. This industrial-grade RS232 to TTL converter operates within a wide temperature range (-40F to 185F / -40C to 85C), and features 600W surge protection and 15kV static protection. The unit is powered from the RS232 data line, and therefore, no external power or RTS, DTR is required.

Declaration of Conformity | RS232 to TTL/CMOS 5V Converter data sheet

FEATURES (INDUSTRIAL RS232 TO TTL CONVERTER)

- Converts RS232 to TTL 5V and vice versa.
- Industrial grade with wide temperature range (-40F to 185F / -40C to 85C),
surge (600W) and static protection (15kV).
- Port-powered, no external power or RTS, DTR required.
- Plug and play (Hot-pluggable, Data format Auto-sensing & Self-adjusting).
- Built-in surge protection, static protection and circuit protection.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE certified: strictly certified by world-class lab TUV.
-
5-year manufacturer's warranty.

PRODUCT PHOTOS (INDUSTRIAL RS232 TO TTL CONVERTER)

RS232 TTL Converter View 1 RS232 TTL Converter View 2 RS232 TTL Converter View 3

SPECIFICATIONS (INDUSTRIAL RS232 TO TTL CONVERTER)

Part Number: TTL-232-1
Compatibility: EIA/TIA RS-232C standard and TTL/CMOS 5V level
Power Source: Port power from RS232 data line
Current Consumption: Less than 10mA
Baud Rates: 300 to 115,200bps (Auto-sensing & Self-adjusting)
Distance: RS232 side: 16ft (5m); TTL side: 10ft (3m)
Connector: RS232 Side: DB-9 Female; TTL Side: DB-9 Male; Termination Board: DB-9 Female and a 4-Way Terminal Block
Surge protection: 600W
Static protection (ESD): Up to 15KV
Dimensions (H x W x D): 0.63 x 1.3 x 3.5 in (16 x 32 x 88 mm) (with Termination Board)
Weight: 1.27 oz (36 g) (with Termination Board)
Operating Temperature: -40F to 185F (-40C to 85C)
Operating Humidity: Up to 90% RH (no condensation)

TTL SIGNAL LEVELS

TTL Input TTL Output
High (>2.0V) High (>3.5V)
Low (<0.8V) Low (<0.6V)

CONVERTER CONNECTOR / TERMINAL BLOCK PINOUTS

RS232 Side

Pin 1 4 6 7 8 2 3 5
Signal DCD DSR DTR CTS RTS TX RX GND
Function Tied Tied TX RX GND
RS232 TTL converter - RS232 DB9 Female PinoutsNote: Some software requires handshake line acknowledgements. To satisfy the requirements, our converter's handshake lines are tied together (DCD, DTR, and DSR tied together, and RTS and CTS tied together). Therefore, you don't have to modify your existing software.

DB-9 Female (view from front)

Terminal Block Side

Pin 1 3 5 9
Terminal Block TX RX GND +5V
Function TTL Out TTL In GND +5V measurement
RS232 to TTL converter - DB9 and Terminal Block PinoutsNote: The TTL-232-1 comes with a 4-way terminal block for easy wire connections. However, you may choose not to use the terminal block provided and simply follow the above table for pin assignments.
DB-9 Male (view from front) / Terminal Block

CONNECTIONS (INDUSTRIAL RS232 TO TTL CONVERTER)

RS232 to TTL converter - Connection

Figure 1: TTL-232-1 Connection Diagram

TROUBLESHOOTING INSTRUCTIONS FOR RS232 TTL CONVERTER

1) Port power measurement
RS232 TTL converter - 5V power measurement
Measure pin +5V and GND with a voltmeter, and be sure that it is around +5VDC (when RS232 port is connected).
2) Loopback Test
RS232 to TTL converter - Loopback test
  • Connect a TTL-232-1 to your PC's COM port and short TX and RX on the TTL terminal block (as shown above).
  • Run 232Analyzer FREE version software on your computer.
  • Select "ASCII" for both the Send and Receive data formats. Then send command and/or string such as "CommFront" from the 232Analyzer software. You should receive an echo of the command/string sent ("CommFront"). By performing a simple loopback test like this, you can test both the transmitter and receiver of the converter. This is very helpful when you are in doubt about the performance of your converter.
RS232 to TTL converter - loopback test 2
Screenshot: Send/receive commands from 232Analyzer software.
232Analyzer is an advanced RS232 Serial Protocol Analyzer software that allows you to control, monitor and analyze serial port (RS232 / RS485 / RS422 / TTL, etc.) activities. Not just the data, it also allows you to monitor or change RS-232's line states: RTS, CTS, DTR, DSR, DCD, and RI.

The FREE version (no time limitation) can be downloaded from here.

  • Model: TTL-232-1
  • Shipping Weight: 0.1lbs
  • Manufactured by: CommFront

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