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DNP/SK25 COM-Port -> PC COM-Port

 
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jimsp



Joined: 14 Apr 2010
Posts: 1
Location: Germany

PostPosted: 19.04.2010, 08:01    Post subject: DNP/SK25 COM-Port -> PC COM-Port Reply with quote

Hi Guys,

Am I correct in assuming that a DNP-COM to PC-COM connection requires a level-shifter (like the MAX232, for instance)?

The documentation for the DNP/SK25 doesn't seem completely clear about the compatibility of the kit's on-board serial ports, other than mentioning in passing that they are "TTL".

Thanks!
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jim spriggs

RAYLASE AG
Argelsrieder Feld 2+4
D-82234 Wessling
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jne



Joined: 05 May 2006
Posts: 31
Location: Hannover

PostPosted: 30.04.2010, 14:12    Post subject: Reply with quote

Hi Jim,

the COM-Port of the DNP/SK25 has no onboard RS232 transceiver. The signals come as LVTTL level (3V) directly from the DIL/NetPC. To connect the interface with a PC-COM you are right that you have to insert a RS232 transceiver (e.g. ICL3222) between the DNP/SK25 and the null modem cable from the PC. The signal allocation you will find in the DNP/EVA10 Hardware Reference.

Have a nice day
J. Neumann
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