HEIDENHAIN MANUALPLUS 620 - Page 1770

1770 HEIDENHAIN Technical Manual MANUALplus 620
Signal levels The signals are both transmitted and received as differential voltage.
A positive differential voltage corresponds to logical zero (OFF).
A negative differential voltage corresponds to logical one (ON).
U
dmin
= 2 V and U
dmax
= 5 V
The control unit detects the differential voltages between U
dmin
= 0.2 and
U
dmax
= 6 V as a logically defined level.
Signal designation The following signals are transmitted as differential signals:
The protective ground connects the transmitter and receiver housings.
GND is the differential voltage reference conductor.
These signals perform the same functions as those on the RS-232-C/V.24
interface.
Pin layout The control and the adapter block have the same pin layout.
+ 6
+ 5
+ 2
+ 0.2
 0.2
 2
 5
 6
"0"
OFF
"0"
OFF
"1"
ON
"1"
ON
U
d
[V]
InputOutput
Signals Signal designation
Data signals TxD, TxD RxD, RxD
Control and message signals RTS CTS
DSR DTR