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Koppelmodul für SIMATIC PDM
Interface for SIMATIC PDM
RS232 Pin Connections
Inputs:
Transmit data
TXD
Data terminal ready
(DTR)
Ready to send
(RTS)
Ground
Outputs:
Carrier detect
CD
Receivedata
RXD
Data set ready
DSR
Clear to send
CTS
Receiver RI
"At least one input must exceed +/--4V to power the unit. Inputs must not exceed +/--12V, and
must be current limited to +/--10mA.
% pwr supply current is shared by the 3 input pins if the absolute value of their voltages are
equal, or by one pin if the absolute value of it's voltage exceeds the others.
Vin is a negative internally generated voltage.
14
/ 16
Pin
Impedance
Voltage Levels *
Ohms
100K +
3
% supply current
% pwr supply current
4
+ DSR load current
+ RXD if true load current
+ CD if true load current
100K +
7
% pwr supply current 2 to 12 V
+ CTS load current
5
Ref
DTR thru 1 K if CD true
1
11 K to --Vin if CD false
DTR thru 1 K if RXD true
2
11 K to --Vin if RXD false
DTR thru 1K
6
RTS thru 1K
8
9
Not used
Operating Instructions
Mark/true
Spacelfalse
2 to 12 V
--12 to 0 V
2 to 12 V
--12 to 0 V
--12 to 0 V
--
0 V
0 V
Output level as received from
DTR
Output level as received from
DTR
Output level as received from
DTR
Output level as received from
RTS
Not used
C73000--B7164--C170--2
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