Publication 1763-RM001C-EN-P - October 2009
Protocol Configuration 519
The DF1 Radio Modem driver can be used in a “pseudo” Master/Slave
mode with any radio modems, as long as the designated “Master” node is
the only node initiating MSG instructions, and as long as only one MSG
instruction is triggered at a time.
For modern serial radio modems that support full-duplex data port
buffering and radio transmission collision avoidance, the DF1 Radio
Modem driver can be used to set up a “Masterless” peer-to-peer radio
network, where any node can initiate communications to any other node
at any time, as long as all of the nodes are within radio range so that they
receive each other’s transmissions.
Using Store & Forward Capability
DF1 Radio Modem also supports Store & Forward capability in order to
forward packets between nodes that are outside of radio range of each
other. Each node that is enabled for Store & Forward has a
DF1 Radio Modem Channel 0 Configuration Parameters
Parameter Options Programming
Software
Default
Channel Channel 0 0
Driver DF1 Radio Modem
Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K 19.2K
Parity none, even none
Node Address 0 to 254 decimal (255 is reserved for broadcast) 1
Store and Forward
File Number
Store and Forward allows messages between two out-of-radio-range nodes to be routed through
one or more in-radio-range nodes. This is the data table file number used for the Store & Forward
Table.
0
Control Line No Handshaking, Half-Duplex Modem (RTS/CTS Handshaking) No
Handshaking
Error Detection CRC, BCC CRC
Pre Transmit Delay
(x1 ms)
0 to 65535 (can be set in 1 ms increments)
When the Control Line is set to “No Handshaking”, this is the delay time before transmission.
Required for 1761-NET-AIC physical Half-Duplex networks. The 1761-NET-AIC needs 2 ms of delay
time to change from transmit to receive mode.
When the Control Line is set to “Half-Duplex Modem (RTS/CTS Handshaking)”, this is the
minimum time delay between receiving the last character of a packet and the next RTS assertion.
1
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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