Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 318)

Publication AG-UM008C-EN-P - February 2005
9-12 Configuring RSLinx Classic Software for DF1 Half-Duplex Communications
Figure 9.11 DF1 Slave Protocol Settings
Table 9.11 DF1 Protocol Settings Parameter Descriptions
Control Control Text
Qty Retries When polling and transmitting, this controls how many attempts are made before giving up on that
operation. Zero (0) is not a legal value. The default is 3 retries.
ACK Timeout (ms) Timeout value before the driver assumes that the current operation has failed. After failure, if the retry
count has not been exceeded, the driver attempts it again. The default is 3000 ms.
Max Pkt Wait Time (s) Maximum period of time the driver keeps a packet buffered in memory while it is waiting for an
opportunity to be transmitted to the slave. When this period is exceeded, the packet times out. The default
is 150 seconds.
Error Checking Mode Select BCC or CRC. All devices on the network must be configured the same. The default is BCC.
Detect and Ignore Duplicate
Messages If selected, the driver keeps the header information of the last packet received from the master in memory.
If a new packet is identical to the last packet, it is considered a duplicate, so the slave is ACKed and the
packet is discarded. The default is checked.
Execute Received Diagnostic
Commands Diagnostic command packets addressed to the same station address as the slave are executed and reply
packets are sent to the sender. If the checkbox is cleared, an error message is returned to the sender. The
default is checked.