HEIDENHAIN iTNC 530 HSCI - Page 1904

1904 HEIDENHAIN Technical Manual iTNC 530 HSCI
Hardware
handshaking
Bit 2 can be set to determine whether the iTNC stops transfer from an
external device by sending an RTS signal.
 Data output from iTNC to EXT
When the receiving buffer is full, the external device resets the RTS signal.
The iTNC detects that the peripheral unit receiving buffer is full at its CTS
input:
 Data input from EXT to iTNC
When the receiving buffer is full, the iTNC removes the RTS signal. This is
detected by the peripheral device at its CTS input:
The DTR and DSR signals indicate the operational status of the iTNC and
peripheral device:
 DTR: Interrogated by peripheral; it is logical one if iTNC is ready for service.
 DSR: Interrogated by iTNC.
• HIGH level means: external data input/output ready.
• LOW level means: external data input/output not ready.
CST
RST
RxD
TxD
RST
CST
TxD
RxD
+

+

+

+

+

+

+

+

Activating
data output
Input buffer
full
Data
+ positive voltage level
 negative voltage level
Data Data
Start
CST
RST
RxD
TxD
RST
CST
TxD
RxD
+

+

+

+

+

+

+

+

+ positive voltage level
 negative voltage level
Start