Parallel or serial port connection for relays
An
Audon Electronics product story
Edited by the Engineeringtalk editorial team
May 3, 2002
Available from Audon Electronics is a range of low-cost relay boards for connection to PC parallel and serial ports.
Available from Audon Electronics is a range of low-cost relay boards for connection to PC parallel and serial ports.
There are three models in the range, each ideal for when a few relays are needed without the expense or fuss of a plug-in card.
The PPO-RL8 is a general-purpose parallel port relay board offering eight 10A changeover relays.
The relays are simply controlled by writing an appropriate word to the PC parallel port: an LED indicates relay status.
Connection to the relays is via screw terminals.
The PPO-RL8 comes with a simple Windows time switch program.
The SPO-RL8, housed in a robust enclosure, provides eight relays and four optically isolated inputs for control and sensing applications.
It is controlled via a serial port using a set of simple text commands.
Connection to the real world is via "pluggable type" screw terminal blocks.
The SPO-RL8 comes with a simple Windows compatible program to set the state of the relays and to display input status.
The SOM-1 serial output module has four single-pole changeover relays which can be independently addressed from the PC.
The standard RS232 serial output is converted to RS485 by the first module and this is used to drive subsequent modules.
Each module may be allocated one of 256 addresses, thus allowing for control of 1024 relays.
Addresses are selected using an eight-way DIL switch and more than one module can have the same address.
This will allow several relays to be controlled simultaneously.
Modules can be physically placed in positions remote from the PC.
The link from the PC serial port to the first module is restricted to approximately 50m.
After that modules can be located as much as 200m apart.
Connection between the PC and the first module would normally use a standard null terminated modem lead connected to the 9-pin D connector.
From the first module to subsequent units twin screened cable is recommended with connections to the screw terminal block provided.
Intermodule wiring may be either parallel or serial with T junctions as required.
Cable impedance matching may be selected by on board links.
The SOM1 is supported by free windows based software.
All relay boards require a 12V power supply, which can be a simple plug-in adapter type.
Full programming examples in Visual Basic, Delphi or C++ are included with all models.
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