Packet generation and sending
In cases when there is a need for low power consumption of the device (i.e. solar or
battery power) the device can be set into one of the three reduced power consumption
modes by using the ATSM command. When in the reduced power consumption
mode, the receiver is not constantly turned on. It is turned on and off 8 times per
second. Therefore, when using this mode, waiting for all the receivers to become
active may induce the additional transport delay. By using the ATSM command the
reduced power consumption mode of operation can be adjusted to fit the various field
configurations. If the devices with the reduced power consumption are
communicating only with a device in a normal mode, the first group of devices is set
to ATSM2 whereas the device operating in normal mode is set with ATSM1. On the
other hand, if all the devices are operating in low power consumption mode, they
ought to be set with ATSM3.
Important note:
When calculating the power budget for the reduced power consumption mode, the
RS232 signal lines should not be omitted. It is recommended that, in these cases, the transmit/receive
signals of the RS232 interface should be switched off when not actively communicating.
Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011
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