HEIDENHAIN ND 281 B v.1 - Manual (Page 39)

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Pin layout RS-232-C/V.24 (X31)
Pin Signal Assignment
1 CHASSIS GND Chassis ground
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 to 19 – Not assigned
20 DTR Data terminal ready
21 to 25 – Not assigned
Levels for TXD and RXD
Logic level Voltage level
Active – 3 V to – 15 V
Not active + 3 V to +15 V
Levels for RTS, CTS, DSR and DTR
Logic level Voltage level
Active + 3 V to + 15 V
Not active – 3 V to – 15 V
RS-232-C/V.24 Data Interface (X31)
Data format and control characters
Data format 1 start bit
7 data bits
Even parity bit
2 stop bits
Control characters Call measured value: STX (Ctrl B)
Interrupt DC3 (Ctrl S)
Continue DC1 (Ctrl Q)
Interrogate error message: ENQ (Ctrl E)
Example: Data sequence during measured value output
Measured value = – 5.23 mm
The measured value is within the sorting limits ( = ) and is the
current value ( A ) of a series of measurements.
Measured value output
- 5 . 2 3 = A < C R > < L F >
1 2 3 4 5 6 7 8
1 Algebraic sign
2 Numerical value with decimal point (10 characters on
the whole, leading zeros are output as blank spaces.)
(Angle measurement “min, sec” up to 3 dec. spaces.)
3 Blank space
4 Unit: Blank space = mm; " = inch; ? = fault
5 Sorting status (<, >, =; ? if P18 > P19)
or blank space
6 Series of measurements
(S = MIN; A = ACTL; G = MAX; D = DIFF)
or blank space
7 CR (carriage return)
8 LF (line feed)