HEIDENHAIN TNC 640 (34059x-01) ISO programming - Manual (Page 443)

HEIDENHAIN TNC 640 443
16.4 Set
ting the D
a
ta Int
e
rf
aces
Setting the data bits (dataBits)
By setting the data bits you define whether a character is transmitted
with 7 or 8 data bits.
Parity check (parity)
The parity bit helps the receiver to detect transmission errors. The
parity bit can be formed in three different ways:
„ No parity (NONE): There is no error detection
„ Even parity (EVEN): Here there is an error if the receiver finds that it
has received an odd number of set bits
„ Odd parity (ODD): Here there is an error if the receiver finds that it
has received an even number of set bits
Setting the stop bits (stopBits)
The start bit and one or two stop bits enable the receiver to
synchronize to every transmitted character during serial data
transmission.
Setting the handshake (flowControl)
By handshaking, two devices control data transfer between them. A
distinction is made between software handshaking and hardware
handshaking.
„ No data flow checking (NONE): Handshaking is not active
„ Hardware handshaking (RTS_CTS): Transmission stop is active
through RTS
„ Software handshaking (XON_XOFF): Transmission stop is active
through DC3 (XOFF)