Elpro Technologies 905U-D User Manual download pdf (Page 57)

Appendix A Hayes Commands

Page 57 © January 2011

&E1

Enable CRC Error Checking

AT&F

Restore Factory Defaults. This function is also available from the DIP Switches.

AT&G

Set module’s Group Address Range 0-255. Default 0.

AT&K

Flow Control Configuration.

&K0

Flow Control Disabled. CTS Always high. Module ignores RTS.

&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. Must be selected for RS-485 to work. CTS is high. CTS goes

low when transmitting data. RTS is ignored.

AT&L Configuration of start-up mode, and controlled mode operation.

&L0 At power-up, the module enters command mode and waits for commands.

Normal single-connect controlled mode operation.

&L1•

If set to transparent mode in AT&M, the module automatically goes online. For

controlled mode, ATD automatically dials the number stored in Z0, ATA answers

an incoming call.

&L2 Auto-connect mode - master. The module “dials” the number stored in &Z0

automatically. It continuously attempts to connect to that number. Use DTR with

the AT&D command to control the connection.

&L3

Auto-connect mode - slave. The module continuously attempts to answer any

incoming call. Use DTR with the AT&D command to control the connection.

AT&M

Operating Mode. This allows selection between transparent mode, controlled

mode and fast operation mode.

&M0•

Transparent Mode.

&M1

Transparent Repeater. All serial data is sent out the radio, with the configured

system (AT&S) and group (AT&G) address. All incoming radio data with the

correct system address and matching group address is sent out the serial port, and

also re-transmitted out the radio port using the unit address (AT&U) setting as the

group address. All incoming radio data with the configured system address and

group address matching the Unit address is re-transmitted out the radio with the

group address set to the group address.

&M2

Controlled Mode.

&M3

Fast Operation Controlled Mode. No repeaters may be used.

AT&N

Abort Connection Control. Controls whether the module will abort a connection

attempt in controlled mode if a character is entered.

&N0

Ignore characters entered while attempting to make a connection.

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Elpro Technologies 905U-D User Manual Page 57

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