User Manual

32 MHX-2400 Operating Manual: Chapter 3 Configuration Options
S Register 213 - Packet Retry Limit
Packet Retry Limit is analogous to Packet Retransmissions, but specifically
applies to Slaves, Repeaters and Point-to-Point Masters. This parameter is
not used by the Master in Point-to-Multipoint networks. Because the Slave
has the advantage of receiving acknowledgements from the Master, it is not
necessary to blindly retransmit each packet. If the Slave does not get an
acknowledgement on the next hop, it will retransmit its packet. This will
continue until the Packet Retry Limit is reached or an acknowledgement is
received. If the limit is reached, the modem will give up and discard the
data. Valid settings are 0 to 255 retries. The default value is 2.
The Repeater makes use of this parameter when it is tuned to its Primary
Hopping Pattern and is acting like a Slave. Likewise, the Master in a Point-
to-Point network uses this parameter because it is expecting to receive
acknowledgement from a Slave. Acknowledgements from Slaves cannot be
carried through repeaters back to the Master. Therefore in point-to-point
networks that make use of repeaters, care must be taken not to set the Packet
Retry Limit too high.
S Register 115 - Packet Repeat Interval
A parameter that is specific to Slaves and Repeaters is the Packet Repeat
Interval.
The allowable settings are 1 through 255. The default is 1.
This parameter defines a range of random numbers that the Slave will use as
the next slot in which it will attempt to send the packet. For example, if this
register is set to 7, the Slave will choose a number between one and seven as
the next slot in which to transmit. Suppose the random number generator
picks 5, then the Slave will transmit in the fifth time slot. A Slave will
transmit a maximum of once per hopping interval, however, depending on
the duration of the hopping interval and the maximum packet size, more
than one slot per hop is potentially available. The Slave will transmit more
frequently when a Repeat Interval with a smaller range is selected. Choose
1 to have the Slave transmit in the first available slot. Choose higher
intervals for less frequent transmission, or to avoid collisions between many
Slaves in the system.
This register is always disregarded and taken as S115=1 in Point-to-Point
mode.