HEIDENHAIN ND 920 - Manual (Page 54)

54
Pin layout X31 (RS-232-C/V.24)
Pin Signal Assignment
1 CHASSIS Chassis
GND
2 TXD Transmitted data
3 RXD Received data
4 RTS Request to send
5 CTS Clear to send
6 DSR Data set ready
7 SIGN. GND Signal ground
8...19
−
Not assigned
20 DTR Data terminal ready
21..25
−
Not assigned
Levels for TXD and RXD
Logic level Voltage level
"1" –3 V to –15 V
"0" +3 V to +15 V
Levels for RTS, CTS, DSR and DTR
Logic level Voltage level
"1" +3 V to +15 V
"0" –3 V to –15 V
Pin Layout X31 (RS-232-C/V.24)