HEIDENHAIN iTNC 530 HSCI Technical Manual page 1905

Software
handshaking
Character parity
Stop bits
Testing the
connection
July 2013
With bit 3 you determine whether the iTNC stops transfer from an external
device with control character <DC3>. Transfer is then resumed with character
<DC1>. (XON/XOFF method)
If transfer is stopped with the control character <DC3>, up to three more
characters can be stored; any further incoming characters are lost. Software
handshaking is normally recommended when interfaces are connected to an
external device.
Note
The iTNC reacts both to hardware and software handshakes, regardless of
the setting in MP5020.x.
If no transmission stop is set in MP5020.x, the iTNC stops the peripheral
unit with the software handshake.
If a transmission stop by RTS and by DC3 is active simultaneously, the iTNC
stops transfer with the hardware handshake.
Bits 4 and 5 determine the type of parity check.
Bits 6 and 7 determine the number of stop bits sent at the end of a character.
If PLC Modules 910x transmit characters via the RS 232-/RS422 interface, the
control no longer checks if a connection is available if bit 10 is set to 1 in
MP5020.x.
Bit 8 and bit 9 in MP5020.x are reserved and currently have no function.
MP5020 Configuration of the data interface
Format: %xxxxxxxx
Input: Bit 0: 0 = 7 data bits, 1 = 8 data bits
Bit 1: 0 = any BCC, 1 = BCC not control character
Bit 2: 0 = transmission stop by RTS not active, 1 = active
Bit 3: 0 = transmission stop by DC3 not active, 1 = active
Bit 4: 0 = character parity even, 1 = odd
Bit 5: 0 = character parity not desired, 1 = desired
Bit 6 = 0, Bit 7 = 0: Length of the stop: 1.5 bits
Bit 6 = 1, Bit 7 = 0: Length of the stop: 2 bits
Bit 6 = 0, Bit 7 = 1: Length of the stop: 1 bit
Bit 6 = 1, Bit 7 = 1: Length of the stop: 1 bit
Bit 8 = reserved
Bit 9 = reserved
Bit 10: 0 = check for missing connection active
Bit 10: 1 = check for missing connection not active
MP5020.0 Operating mode EXT1
MP5020.1 Operating mode EXT2
MP5020.2 Operating mode EXT3 (PLC)
MP5020.3 Operating mode EXT4 (PLC)
10.7 Configuration of Interfaces
1905