User manual

Publication AG-UM008C-EN-P - February 2005
1-18 Designing Communication
Figure 1.9
DF1 Radio Communication
Figure 1.10
Read or Write Requests via DF1 Radio Modem
Modem
Modem
Station 2
Station 1
2. Station 1 sends its reply message.
1. Message (via MSG instruction) sent to a specific
station (eg., station 1).
• Send command
packet
• Start reply
timer
• Wait for reply
(or timeout)
• Ladder logic
triggers MSG
• DF1 driver
formats
command
packet
Data table
reply timeout received
return error indication
reply packet received return data