Background knowledge: Power for the interfaces The interface type described on this page is powered from the signal lines of the serial interface and generally requires no external power supply to operate on standard RS232 interfaces.
If however there are supply problems due to low-power interfaces, it is always possible to externally power the interface with up to 9V using its handshake inputs, or to use fiber-optic interfaces having their own power supply (e.g. model 81201).
With model 81029 there is also a 9-pin special version available whose transmission distance is limited to from 0 to 20m, but which only places an approx. 2mA load on the connected RS232 interface. With this version it is also possible to run on lower power RS232 interfaces without the need for an additional voltage source.
Background knowledge: Transmission distances The limitation with respect to a minimum required fiber optic cable length of 5 meters is only relevant when using the maximum baud rate of 115.200 baud while simultaneously running the interfaces on RS232 ports with low output voltages.
If any of these limiting conditions does not apply, the Interfaces (e.g. for galvanic isolation of serial ports) can also be operated using very short fiber optic cable lengths.
Due to the current-saving construction of model 81029 we recommend in such application cases still using this Interface type, since the connected RS232 ports are only minimally loaded.
Technical data:
Baud rate:
110..115,200 baud
Data format:
any format
Signal lines:
RxD, TxD (full duplex)
Transmission distance:
typically 5..80 meters (Specifications for maximum transmission distance when operating on RS232 ports with MC1488 driver chips and with handshake lines connected)
Power supply:
Generally from the RS232 signals For low-power versions of the RS232 interface external supplying of the interfaces via handshake inputs with up to 9V DC is possible
RS232 adapter:
9-pin SUB-D socket for PC
Fiber-optic cable adapter:
integrated socket with automatic interlocking of the fiber-optic cable
Fiber-optic medium:
Duplex plastic optical fiber cable Dimensions 2.2 x 4.4 mm with a fiber diameter of 1 mm Material: core: PMMA, cladding: PE
Cutting tool for Duplex POF cable (This article cannot be ordered as a sample. So that you can assess the cut quality we will be glad to provide you on request with an optical fiber cable which has been trimmed using the cutting tool. )
