HEIDENHAIN MANUALplus 620 Technical Manual page 1770

Signal levels
Signal designation
Pin layout
1770
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 = 2 V and U = 5 V
dmin dmax
The control unit detects the differential voltages between U
U = 6 V as a logically defined level.
dmax
The following signals are transmitted as differential signals:
Signals
Data signals
Control and message 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.
The control and the adapter block have the same pin layout.
Signal designation
TxD, TxD
RTS
DSR
HEIDENHAIN Technical Manual MANUALplus 620
= 0.2 and
dmin
RxD, RxD
CTS
DTR