User`s manual

EM1500 User’s Manual www.rabbit.com 51

Default settings

The following settings are in effect by default, or after an ATZ command:

• E1: Echo AT commands

• &C, &D, &K, &S: Flow control and modem handshake lines set according to

the configured defaults

• Q0: Issue response codes

• V1: Issue English word response codes

DTR Control

This is where you specify how to use the DTR modem control line. This is only appli-

cable if the line is not being used for hardware flow control, and the serial port has

modem control lines which include this signal, i.e., SER1, SER2 and possibly SER3.

The choices are:

• Active - always asserted

&Kn

Other flow control: n is a number which has two fields:

The low 3 bits of n select the transmit flow control as follows:

0 = none

1 = CTS (or RTS for SER2)

2 = XON/XOFF

3 = DSR (or DTR for SER2)

4 = DCD (SER1, SER3 only)

The next higher 3 bits of n select the receive flow control as

follows:

1 = none

2 = RTS (or CTS for SER2)

3 = XON/XOFF

4 = DTR (or DSR for SER2)

5 = DCD (SER2 only)

Any values that are not listed here default to “none.”

&S0 DSR (SER2) or DTR (others) always asserted

&S1 DSR/DTR asserted when connection is established

+++

This character sequence, preceded and followed by at least one

second idle time, causes an active session to be temporarily

interrupted and Hayes modem mode entered.

1. This control may be overridden by AT commands or by RFC2217 control.

Table 5.1 Supported Command Set

Command Action