The Control-it 5251 is our 2nd generation RS232 to RS485 converter. It is fully automatic, and optically-isolated, allowing communication with remote devices up to 1.2km away.
- Check production status
- Control machinery
- Gather statistics
- Modify programs remotely
- Control industrial networks
- Control relays and read inputs
- Integrate the Control-it I/O System
| Some Benefits of the 5251 Automatic Converter: Saves Time: - No technical setup procedures required
- Standard RS232 software needs no modification to run a RS485 link
- No jumper settings necessary
High Performance: - Guaranteed to work over a data range of 300 to 115200 bps
- Very fast data turnaround. For 8 bit no parity: 0.2ms at 9600bps
- Communication distance of up to 1.2km (4000 feet)
Versatile: - Small size, lightweight unit
- 9 - 24 volt power supply
- Works with any terminal software
Easy to Install: - DIN rail mounting with universal foot for symmetrical and asymmetrical rails
- RS232 side takes standard DB9 connector
- Screw terminal connector with strain relief for RS485
- Separate transmit and receive lights show data flow
Safe: - Full optical isolation protects your computer from power spikes
- Robust, sealed plastic unit
- Microprocessor has watchdog protection, preventing the possibility of the module holding the line on failure
Warranty: | Why choose the Control-it 5251 Converter? The RS232 serial interface protocol is the only connection standard adhered to by all computer manufacturers. However RS232 is only able to operate effectively where the computer and a single device connected to it are situated within a few metres of each other. Where information needs to be transmitted between multiple devices at distances of up to 1.2 kilometers remote from the computer, the RS485 protocol is able to achieve this economically using a 2 wire 'twisted pair' circuit. The Control-it 5251 easily and economically provides the interface between your computer's RS232 port and the RS485 circuit. The RS485 communications protocol operates like a telephone party line. One device communicates at a time. The Control-it 5251 converter is designed to enhance your data throughput up to 80% over similar converters. The following screen shots compare a character sent at 9600 bps, showing a conventional automatic converter versus the Control-it 5251 converter 
| Fig. 1 A standard converter
Total time wasted is 1300uSec | Fig.2 The Control-it 5251 converter
Time wasted is less than 200uSec | Figures 1 and 2 show the RS485 signal. - To the left of point 'A', the RS485 line is floating and available to any unit on the line.
- Between points 'A' and 'B' a single data character is being transmitted.
- Between points 'B' and 'C' the party line is being held without any transmission taking place. This represents wasted time as no other unit can transmit without data being lost. Note that in Fig 2 this time has been reduced to less than 200uSec.
- To the right of 'C' the RS485 line is once again floating and available to any unit on the line to use.
The danger with a standard converter's wasted 1300uSec is that a remote device will respond before the RS485 line is available. Some remote devices can be programmed to wait longer before they respond, but this slows down the data transfer. This potential problem is eliminated with the Control-it 5251 converter.
Specifications for 5251: | Dimensions in mm | 80(L) * 25(W) * 75(H) | | Enclosure | Robust ABS | | Transmission Distance | 1.2km (4000 feet) | | Weight | 90g | | Operating temperature | 32° to 140° F ( 0° to 50°C) | | Storage temperature | -4° to 158° F (-20° to 70° C) | | Humidity | 15 to 90% relative non condensing | | Isolation Voltage | 1500V max transient (to EN 60950 : 1992) | | Power | 9-24Vdc unregulated
35mA at 12Vdc on RS485 side | | Connectors | RS232: DB9 female | | RS485: Plugable 5 way screw terminal connector with strain relief 0.2-2.5mm2 (AWG 24-12) | | Operating mode | 2 wire half duplex point to point or Multidrop | | Data rates | 300 to 115200 bps | | Indicator lights | TXD, RXD and STATUS |
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