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12
Serial
Interface I
Pin Signal
1 GND Ground (shield)
2 RXD (+) Receive data
3 +5 V Output +5 V / 20 mA
4 n.c.
5 RXD (-) Signal ground
6 DTR Open collector; active if
DTR is +8 V
7 DTR (Data Terminal Ready)
+8 V: ready to receive
-7 V: not ready to receive
8 RTS (Request To Send)
+8 V: ready to receive
-7 V: not ready to receive
(text buffer is full)
9 RTS Open Collector; active if
RTS is +8 V
The serial interface I has been designed to allow the
implementation of all widely used interfaces:
RS 232 C; RS 422; RS 485 and Current loop.
See chapter 4.3.: Connecting diagram