Background information: As an option all serial W&T PCI interface cards in standard format offer the possibility of providing two additional ports in addition to the two already present on the card. These two interfaces are configured on the card as serial TTL ports which can be converted into any desired type of port by using the interface modules.
Note however that the optional ports do not provide galvanic isolation with respect to each other or to the PC, so that these ports can only connected to a peripheral which is not likely to be characterized by ground potential differences. Compatible peripheral devices would include those located in the immediate vicinity of the PC and which are powered from the same sub-distributor, as well as peripheral devices which are inherently potential-free. This is generally the case for any device which is powered from the interface or by a plug-in power supply. Otherwise you will need to provide external galvanic isolation.
The additional interface modules are connected to the interface card by means of 2mm flat ribbon cable and attached using a slot in the PC case. Both components can be ordered as a separate accessory under article number 13013.
Technical data:
Number of ports:
2 isolated RS422/RS485 ports 2 non-isolated serial TTL ports
Operating modes:
RS422 RS485 2/4 wire with handshake control RS485 2/4 wire with automatic control
Switching time:
approx. 10µs for switching from data send to receive for RS485 automatic control (can be changed on request)
UART:
16950 with 128-byte FIFO
Base addresses:
automatic configuration
Interrupts:
automatic configuration
Baud rate:
50 ..460,800 baud
Data format:
any format
Signals:
RxD A/B, TxD A/B, CTS A/B, DTR A/B
Serial connections:
9-pin SUB-D connector
Galvanic isolation:
Isolation voltage min. 1 KV DC between PC and serial ports 1 and 2
