3.3.4.1.2 Data Output - Siemens SINUMERIK 840 Planning Manual

3 Interface Modules
3.3.4 RTS-LINE (RTS/CTS)

3.3.4.1.2 Data output

DTR
DSR
CTS
RTS
RxD
TxD
Ready to receive
After initialization (activation) DTR changes to 1.
The pin assignments refer to the transmitter shown in the figure of Section 3.3.4.
After initialization of the interface, the DTR signal line is activated. The signal level of DSR is
checked prior to transmission of the first character (depending on configuration). This
interrogation is subject to time monitoring. If the DSR level does not change to 1 within a
period of three minutes, the transmitting job is returned with a negative acknowledgement.
When a character is transmitted, the signal level at the CTS pin is checked first. If CTS is
active, the character is sent. If CTS is inactive, the monitoring time T
status is then checked every 100 ms until the monitoring time expires. If the CTS signal does
not change to the active state within the specified monitoring time, the driver returns the
transmission job with negative acknowledgement.
The following parameters of the RTS-LINE procedure are configurable:
Transmission rate
Monitoring times
DSR evaluation
Number of end identifiers
Node states equal
3–26
Not Ready to receive
ready to receive
(Speed of data transmission)
(Character delay or character monitoring time and device
monitoring time)
(Check if connected node is active)
(Number)
(Yes/no)
© Siemens AG 1989 All Rights Reserved
06.91
Not
ready to receive
is started. The CTS
m
6FC5 197-0AB20-0BP0
SINUMERIK 840/880 (PJ)