Talk:CQRDT9015 RS232 to RS485 Adapter(Optical Isolated)

Introduction

• The RS232 to RS485 converter of CQRobot provides industrial grade isolation with fairly resistant to noise. It is an optically isolated and protection type converter, separating the data lines inside the unit, this prevents noise, high voltage spikes, surges and ground-loops from damaging your computer or the equipment you have connected to the converter that can greatly improve the signal conversion efficiency, and protect the ends of equipment.
• This converter is port-powered, you should in most cases be able to communicate up to the specified 4000 feet (1200m), however adding a terminal resistor can interfere with this distance because it increases power consumption. If you need it as your case may be, the pin of VCC allows you to connect a 9V external power supply to it. Therefore, you will get the maximum transmission distance: 4000 feet (1200m) (RS-485); 50 feet (15m) (RS-232).
• This product is with universal DB9M/DB9F adapter plugs(DB-9 Female RS-232 end; DB-9 Male RS-485 connector). The standard DB9 connector is useful when using any type of new and old serial RS485 device. *Its output comes with a terminal block, which is connected with twisted pair or shielded cable, making it quite convenient for either connection or dis-assembly.
• It has LED lights for indicating RX/TX data flow, very helpful when troubleshooting.
• The built-in high sensitive receiving circuit to enhance the weak signal amplification. With fast Transient voltage suppression protector (TVS) to protect RS-485 device.
• The unit is passive, therefore, normally no external power or flow control is required.
• The circuit is with built in auto transceiver and anti-collision I/O circuit automatically controls data flow direction, these ensure the program written in RS-232 mode can be safely running in RS-485 mode without having to change, it fit for the existing software and hardware interface.