Rs-232 Interface Parameters - Siemens SINUMERIK 840D Operator's Manual

7
"Services" Operating Area

7.4 RS-232 interface parameters

7.4 RS-232 interface parameters
Protocol
Transfer
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Notes on operation can be found in 7.5.2 Setting the RS-232
interface. Information about the configuration of the interfaces can be
found in /IAM/, IM4 Installation and Start-Up Guide HMI Advanced.
As soon as RS-232 transmission starts, detailed messages indicating
the current transmission status are output in the dialog line of
SERVICES. These messages are:
"Wait for CTS signal"
"Wait for DSR signal"
"Wait for Xon character"
"Data transfer active"
The following protocols are supported for transmission via RS-232-C:
· XON/XOFF and RTS/CTS,
· Software Flow Control and Hardware Flow Control
XON/XOFF (handshake)
It is possible to set the two modes for RS-232 transmissions under
"Interface", i.e. Wait for Xon for data receive and Send Xon for data
transmission. The default setting is H11 or H13.
One possible way of controlling transfer is to use control characters
XON (DC1, DEVICE CONTROL 1) and XOFF (DC3). If the buffer of
the peripheral device is full, it sends XOFF and XON as soon as it can
receive data again (= default).
RTS/CTS (handshake)
The signal RTS (Request To Send) controls the transmission of the
data transmission equipment.
Active: Data can be transmitted.
Passive: The CTS signal (Clear to Send) is the acknowledgment
signal for RTS and confirms that the data transmission
equipment is ready to send.
From HMI software version 6.2, there is also the option of
transmission via secured protocol (ZMODEM protocol).
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
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03.04
Ó Siemens AG, 2004. All rights reserved