© Microhard Systems Inc. Confidential 84
6.0 Register/Command Reference
Values (10 to 65535)
S83 Records TTL
30
The P900 keeps record of all other modems it has heard from. This information
may be useful to advanced users in system testing and troubleshooting. The
RSSI in the records is averaged over the last 8 measurements. Every time a
modem is heard from its record is renewed. The ‘Time To Live’ parameter
defines how quickly entries get aged and deleted if not renewed. The range is
10 to 65535 seconds. The default is 30 seconds. The content of the records
can be viewed through the menu, see the ATM command for more information.
Values (0 to 255km)
S85 (PP/PMP) Distance to Master
3
The distance from a slave (repeater) to its master (repeater). This is used by
slaves and repeaters in PMP and PP modes. 0 to 255km, the default is 3km.
Long distance causes propagation delays, S85 should be set accordingly.
Values (0 to 255km)
S86 (PP/PMP) Distance From Master
3
The distance from a master (repeater) to its farthest slave (repeater). It is used
by the Master and repeaters in PMP and PP modes. 0 to 255km, the default is
3km. A setting of 255 means no slaves will be transmitting any packets - one
way transmission from the master.
Since the timing on slaves (relative to master) is already offset by the propagation delay, transmitting data back from
slaves to the master causes doubling of the delay when viewed on the master. When distances are long and not
accounted for by setting S86 accordingly, a packet from far away slaves may arrive too late for the master to receive
it before the hop interval expires. When there are no slaves that may transmit data back to the master (one way
transmission), the master may use its bandwidth more effectively by not reserving time in the hop interval for slave’s
data. S86=255 is a special value to indicate to the master that slaves will not transmit back.
IMPORTANT: Slaves in PP mode acknowledge the master’s data, therefore in PP mode S86 must be configured
properly even if there is no user data coming from the slaves.
Values (selection)
S87 (MESH) Enable S105 as MAC
0 - Disable (default)
1 - Enable
Enables using S105 as modem’s units address in Mesh. Can be useful in
installations where many modems send data to a central location. If the
Destination address of those modems is set to match a unique MAC address of
the receiver, and the receiver fails and needed to be replaced, it may be difficult
to reprogram the destination address S140 on all radios to the new MAC
address of the replaced radio.
This feature can also be useful in fleet management applications, or roaming
mesh networks. With roaming, a sink of data in each network will have the
same address, for example UA = 1. In this case a roaming remote will have its
DA = 1 and will always send data to a sink regardless of which network the
remote is connected to in any given time. The range is 1 - FFFE (of S105), the
value must be entered as a hex number.
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