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Chapter 5: Configuration
Table 5-2 (continued). S Register settings.
y < command
command name > x
Description
S143 (continued)
Sleep Mode (continued) This register applies only to Remote (i.e. not Master) modems, and determines if
the Remote should remain active continuously (S143=0, default), or enter a
timer-based sleep mode.
Sleep Mode 1 (continued):
For OEM models, the !WAKEUP_usr input (pin #8) can be used to wake the unit
at any time. The unit sleeps for S144 seconds or until the falling edge of the
!WAKEUP line. The unit will stay awake for at least S145 seconds. After that, the
unit will go to sleep if the !WAKEUP line is high and all data is sent.
Sleep Mode 2:
This mode is similar to Sleep mode 1, except that data will be monitored only on
the serial port. If no data is being transmitted or received after an amount of time
specified by S145 (Wake Time), the unit will sleep for the amount of time
determined by register S144 (Sleep Time).
Sniff Mode 1:
When status register S143 is set to a value of 3, the unit will monitor all data from
the serial and RF link. Upon wake up, the unit will begin to try to find a master or
repeater to synchronize to. The amount of time the unit tries to find a master is
determined by the number of hops, rather than time. (Time can be calculated by
multiplying the number of hops in S237 by the hop interval specified in register
S109).
If a master is found, the unit will stay awake for at least the time specified by
register S145 (Wake Time). If there is data to transmit, the unit will stay awake
until all data has been transmitted. If a master or repeater is not found, the unit
will sleep for S144 (Sleep Time) seconds. The sniffing cycle is very brief.
If data is detected on the local serial port, the unit will immediately wake up.
NOTE: The most effective way to put an entire network into sleep/sniff mode is by
turning off, or putting into command mode, the Master modem.
S
niff Mode 2:
When status register S143 is set to a value of 4, the unit works the same way as
sniff mode 1, except that the unit will monitor all data from only the serial port.
Sniff Mode 3:
When status register S143 is set to a value of 5, the unit works the same way as
sniff mode 1 and will monitor all data from both the serial and RF link. The
difference is that if no master is found, all data will be discarded.
Values:
0 active (no sleep)
1 sleep mode 1
2 sleep mode 2
3 sniff mode 1
4 sniff mode 2
5 sniff mode 3
