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Pin layout RS-232-C/V.24 (X31)
Pin
Signal
1
CHASSIS GND
2
TXD
3
RXD
4
RTS
5
CTS
6
DSR
7
SIGN. GND
8 to 19
–
20
DTR
21 to 25 –
Levels for TXD and RXD
Logic level
Active
Not active
Levels for RTS, CTS, DSR and DTR
Logic level
Active
Not active
Assignment
Chassis ground
Transmitted data
Received data
Request to send
Clear to send
Data set ready
Signal ground
Not assigned
Data terminal ready
Not assigned
Voltage level
– 3 V to – 15 V
+ 3 V to +15 V
Voltage level
+ 3 V to + 15 V
– 3 V to – 15 V
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
=
1
2
3
4
5
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)
A
< C R >
< L F >
6
7
8
47
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