User Manual

MHX-920 Operating Manual: Chapter 4 Configuration 31
S Register 213 - Packet Retry Limit
Packet Retry Limit is analogous to Packet Retransmissions, but specifically
applies to Slaves and Repeaters. This parameter is not used by the Master.
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.
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.