HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 663)

8-16
TNC 407/TNC 415/TNC 425 2 TNC data interfaces 01.98
2.3.2 Signal levels
On a RS-422/V.11 interface, the signals are both transmitted and received as differential voltage.
A positive differential voltage corresponds to logic "0" (OFF), and a negative differential voltage to
logic "1" (ON).
Differential voltages between
Vdmin = 2V and Vdmax = 5V
are transmitted and the control unit detects the differential voltages between
Vdmin = 0.2V and Vdmax = 6V
as a logically defined level.
– 0.2
Ud [V] Ausgang
Output
Eingang
Input
"0"
OFF
"1"
ON
+ 0.2
– 0. 2
– 0. 5
– 0. 6
+ 0. 2
+ 0. 5
+ 0. 6
"1"
ON
"0"
OFF
2.3.3 Signal designations
With a RS-422/V.11 interface, the following signals are transmitted as differential signals:
Data signals:
TxD, TxD RxD, RxD
Control and verification signals:
RTS, RTS CTS, CTS
DSR, DSR DTR, DTR