XPS/XPS-E User's Manual Contents
COMSOFT 11
2.4.3.3 Handshake Flow Control
If data is exchanged via the serial interface, XPS/XPS-E supports the following
modes for the handshake:
• No Handshake
• Hardware Handshake. The receive data flow can be controlled at the
respective device by setting or re-setting the RTS-/CONTROL signal
(CTS/INDICATION=0 -> no sending). A corresponding example for
cabling can be found under chapter 5.2.2 and 5.2.3.
• Software Handshake. The receive data flow can be stopped by the
respective device by sending the control character XOFF (0x13). The
sending procedure will only be re-started if a XON character (0x11) is
received or a Timeout (XOFF-Timeout) for the receipt of the XON
character.
The interruption of the sending procedure or the XOFF timeout is shown in the
status byte of XPS/XPS-E (see chapter 4.2) by means of the bit
XOFF_CTS_FLAG.
Handshake Mode Value (dec) Value (hex)
Hardware Handshake (CTS, RTS for RS232
and CONTROL/INDICATION for RS422)
72 0x48
Software Handshake 83 0x53
No Handshake * 78 0x4E
Table 5: Handshake Modes Octet 14
2.4.3.4 XOFF_timeout – Timeout of Software Handshake
The XOFF timeout is calculated by means of VALUE * 100ms. This value is
entered into Octet15 of the parameterisation data. If no software handshake is
entered, this value is insignificant.
If the value 0 is given, the timeout is set to 10 seconds.
Note
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