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CHAPTER 3 – SPECIFICATIONS
RTS Control of Power Mode AT+CFUN=9.
Device in power saving mode, this command forces the module to monitor the RTS control line indicating if the
user application (DTE) is ready to receive data from the module (DCE):
RTS OFF: This condition causes the module (DCE) to power down its serial port and stays in CFUN=0 or CFUN=9
mode, in accordance with the entered command.
RTS ON: This condition causes the module (DCE) to power up its serial port and enters CFUN=1 mode (Normal
Operative Mode, factory setting).
DTR Control of Power Mode AT+CFUN=5
In CFUN=5 mode, the module monitors the DTR line, indicating if the user application (running on the DTE) is
ready to operate:
DTR OFF: The module enters power saving mode (11- 20ma)
DTR ON: The module detects this control line condition and exits power saving mode.
In AT+CFUN=7 mode, the module forces CTS=OFF when it enters power saving mode. After exiting power saving
mode, it forces CTS=ON.
CTS control line indicates permission from the DCE for the DTE to send data to the DCE. When the module is not
ready to receive data (e.g.: commands) it ties up the CTS line, when it is ready to receive data it ties down the CTS
line. The user application can monitor the CTS control line to check if the module is ready for commands, in
accordance with V.24 Standard
Notes
When the module is powered ON the power saving function is disabled (CFUN=1, factory setting) in order to
guarantee the data exchange between the H5 device and the user device; for this reason the CFUN mode
command should be entered after every power up.
The protocol implementation of the module requires a delay between consecutive activation of CFUN=1 and
CFUN=4 (or vice versa) modes. It is suggested you use a delay of 10 sec.
The power saving function does not affect the network activity of the module. During the power saving mode
the module remains registered on the network and reachable for incoming calls or SMS. If a call comes in during
the power saving mode, the module will wake up and proceed normally with the unsolicited incoming call code.
Assume that the module is in power saving mode. The paging time range is 0.5 - 2.1 sec, depending on DRX time
set by network. When the module wakes up from the power saving mode, it takes a maximum of 150 ms before
checking the DTR line coming from the DTE. If a command is received during power saving, the module needs at
least 0.5-2.1 sec +150 ms to be ready. Use a delay of at least 2250 ms between opening the port (DTR=ON) and
sending commands.
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SocketModem Cell HSPA and SocketModem iCell HSPA MTSMC-H5 Device Guide
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