Procedures RS232 Modem Support
ML2437A/38A OM/PM PN: 10585-00001 Rev. P 6-7
Modem Compatibility and Commands
The ML243xA Power Meter firmware supports Hayes-compatible modems. The commands
used are as follows:
Serial Interface Remote Operation Example
This section presents an example of Autodial using a terminal emulator on a remote
computer ( \n = newline, \r = carriage return).
1. Initialize local modem, using the same setup as the power meter:
at&h1&r2x4v1q0f1s0=1e0\r
The modem should respond:
OK\n\r
2. Dial power meter:
atd<phone number>\r
When the modem finally connects to the power meter modem, the response will be:
CONNECT\n\r
There might be additional information after “CONNECT” but before the line
termination characters.
3. The remote computer is now connected to the power meter. The power meter can now be
asked to identify itself:
*IDN?\n
Table 6-4. Modem Compatibility Commands
Command Definition
+++ modem escape sequence
atz reset modem to factory defaults
at&h1&r2x4v1q0f1s0=1e0 initialize modem for power meter use
atd “number” dial “number”
&h1 transmit data flow control - use CTS
&r2 receive data flow control - use RTS
x4 full result code setting
v1 result codes in verbal mode
q0 result codes displayed
f1 local data echo OFF
s0=1 auto answer after 1 ring
e0 local command echo off
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