Karel MS48

Cost effective PBX/PABX call accounting solution

Karel MS48

PKCR Card            PC
Connector Pin No^Signal^25-pin connector^9-pin connector^
|1|     +10 VDC|        4 |     7|
|2|     -10 VDC|        20|     4|
|3|     TXD     |3|     2|
|4|     RXD     |2|     3|
|5|     PC GND  |7|     5|

The protocol for PC-Exchange is using a baud rate of 4800 Bps, 8 data bits, 1 Stop bit and no parity.

^RS232 Card     ^^      PC^^
^Connector Pin No^      Signal^         25-pin connector^       9-pin connector^
|1|     TXD     |3      |3|
|2|     RXD     |20     |6|
|3|     GND     |7      |5|

For this use a baud rate of 2400 bps, 8 data bits, 1 stop bit, and EVEN parity.