User's Manual

Page 75
Bit 1: RS485 collision avoidance
0 Invalid collision avoidance function (default value)
1 Use collision avoidance function
Table 5–24: Collision Avoidance Function
• Sets to decide whether to use the collision avoidance function or not, together with
•
d starts re-measurement of its packet interval.
•
es
• Bit 2 is used for the purpose
Bit 0: Global addr
bit 2.
When modem tried to output a response or the received data, the modem outputs only
if RS485 line is available at the timeout of RS485 Packets Interval (REG07). When
RS485 line is not available at the timeout, the modem waits for a line becomes
available an
Set to 1 makes it unable to output neither response nor the received data, unless other
modem(s) outputs any data to the RS485 line and interval time measuring becom
effect.
of resolving this problem.
essing command response
0 No P0 response to global addressing command (default value)
1 Respond P0 response to global addressing command
Table 5–25: Global addressing command response
Set to decide whether to return “P0” response (including “P1” for the transmit •
•
ent simultaneously on default memory setting. Such potential
problem can be avoided by limiting the modem to output the response to the global
addressing command is only one.
command) to the terminal equipment for the global addressing command
(commands for Addresses 240 to 254).
When the global addressing command is issued to plural modems, which are multi-
dropped and have the same global address on RS485 line, there is a possibility
causing data collision on the RS485 line. Unless the RS485 Packet Interval is
properly set. This is because all modems return the “P0” (or P1) response to the
terminal equipm
Futaba Corporation Rev. 050415-01.1