Elpro Technologies 905U-D User Manual download pdf (Page 44)

905U-D Radio Modem User Manual

Man_905D_1.10.doc Page 44

Controlled Mode Link Check and Reset times

If the master module has not sent or received a radio message within a preset time, it will send a

check message to make sure that the link is still active. If it does not receive a response from the

slave unit, it will disconnect the link and reset DCD. The check time can be configured using the

ATS6 command. For example, ATS6=10 sets the check time to 10 sec.

If the slave module does not receive a radio message within the link reset time, it will

disconnect the link and reset its DCD. The link reset time can be configured using the AT\T

command. For example, AT\T12 sets the link reset time to 12 seconds. The link reset time

should be larger than the link check time.

Note that any module can be master or slave - the master module for a specific link is the

module which initiated the connection (by ATD).

The default for both of these parameters is 0 which disables the link check and link reset

function.

Configuration of Flow Control

CTS/RTS flow control can be configured. This may be desirable to ensure data is not lost if

transmitting large amounts of data.

AT&K

&K0

(default) Flow Control Disabled. CTS Always high. Module ignores host’s

RTS. Select for full duplex RS232 with no flow control.

&K1

not used

&K2

not used

&K3

CTS/RTS Flow Control. CTS Reflects the state of the local buffer. Module

only transmits serial data when RTS is high.

&K4

RS-485 Control - flow control disabled. Must be selected for RS-485 to work.

CTS is high. CTS goes low when transmitting data. RTS is ignored.

Configuration of Error-checking

Error-checking is normally disabled for transparent mode, and normally enabled for controlled

mode. The configurations for transparent and controlled modes above follows this convention.

However you are able to override this.

AT&E

CRC Error Checking

&E0

Disable CRC Error Checking (default)

&E1

Enable CRC Error Checking

View Configuration

The AT&V command will output to the terminal a listing of all configuration settings.

AT&V

Show all settings including S registers

&V0

Same as AT&V

&V1

Only show settings that are different from the defaults.

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