Comtrol DeviceMaster Up, Руководство пользователя

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Chapter 3. Configuring the DeviceMaster UP DeviceMaster UP PROFINET CbA User Guide : 2000409 Rev. D - 29
Packet ID Settings
3.4.2. Packet ID Settings
Use the Packet ID Settings area of the Edit Serial Configuration page to configure the serial packet
identification (ID) settings for a serial port.
Packet Identification
Settings
Field Descriptions
STX Detect
When enabled, the DeviceMaster UP looks for the STX character, which is
configurable as byte 0 or 1. The default is 1 byte (0x02 hex).
• enabled - When enabled, the DeviceMaster UP scans serial data for STX in
the first byte. If STX is found, the data is collected. When ETX or Timeout
is found in the first byte, the data is declared to be a packet and moved
into the
bstring output variable. If the first byte is not STX, the byte is
discarded and bytes continue to be discarded until an STX is found.
•
none
- When disabled, the DeviceMaster UP does not scan the data for
STX.
ETX Detect
When enabled, the DeviceMaster UP looks for the ETX character, which is
configurable as byte 0 or 1, or CR-LF. The default is CR-LF.
• enabled - When enabled, the DeviceMaster UP scans the serial data for
ETX. If ETX is found, the data is stored as a packet.
•
none
- When disabled, the serial data is not scanned for ETX.
• CR-LF - When CR-LF (Control line feed) is enabled, the DeviceMaster UP
scans for CR-LF.
Packet Timeout Detect
When enabled it specifies the interpacket timeout in microseconds (ms). The
default is disabled.
•
enabled
- When enabled and the time between characters exceeds the
Timeout (ms) value, that data is stored as a packet.
• disabled - When disable, the data is not scanned for Timeout.
Use Handshake When checked, it enables handshaking. The default is enabled.
Strip STX/ETX
This check box is clear by default. When you select this check box, the
DeviceMaster UP strips STX/ETX characters from received serial packets.
Clear the check box when you do not want the DeviceMaster UP to strip STX/
ETX characters from received serial packets.
Note: Serial Packets sent from the PLC to the DeviceMaster UP (over
Ethernet
®
), and then sent out the serial port, are not checked for STX/
ETX. No STX/ETX character stripping occurs in these serial packets,
and framing/parity/overrun error checking does not apply.
Display Last Read Packet
When checked this enables the
Display Last Read Packet
. The default is
disabled.