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EM1500 Configuration
5.1.6 Modem Tab
Any of the serial ports may be configured to look like a Hayes-compatible modem to an external device,
except for SER4. Since many existing devices expect to be able to talk to modems, this allows the device
be configured to “dial out” to hosts on the network.
The following screen capture shows configuration parameters for SER2. The parameters for SER1 and
RS485 are (mostly) a subset of these.
Figure 5.7 Modem Dialog for SER2
AT command set
Check this box to enable AT command emulation for the selected serial port.
for the list of AT commands emulated by the EM1500. Unless other-
wise noted, it is assumed that the AT prefix has been provided. Commands can be
entered in upper or lower case. For the AT prefix, all uppercase or all lowercase must
be used (e.g., AT or at, but not At or aT). The following commands may have mixed
case.
After the AT prefix which starts each command line, any reasonable number of com-
mands can follow (without repeating the AT prefix). Commands can be strung
together without spaces, or spaces can be used to delimit the commands (for readabil-
ity). If commands are strung together, then those commands which do not take a
numeric parameter (such as H and Z) should have a dummy '0' (zero) parameter
appended after all but the last, e.g., ATZ0I0H<CRLF>.
If entering commands manually, e.g., via a dumb terminal, you can use the backspace
key (ASCII 8 or control-H) to edit the command line. The command line is terminated
by line-feed (LF), carriage return (CR), or both (CRLF). Any response strings gener-
ated are usually preceded and followed by CRLF.
This is an industry standard command set; however, most manufacturers have slight
variations from the original standard. The EM1500 is not a normal telephone line
modem, so many of the original AT commands are not relevant (such as whether Bell
or CCITT signalling is used).
AT command emulation is most useful for SER2, since that serial port looks “most
like” a modem to the external device: in particular, it has DCD and RI outputs, which
are not available on the other ports. AT command emulation is useful on the other
ports as well (except SER4); however, some of the commands will not be relevant
Содержание EM1500
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