User's Manual

Page 46 FRH-SD07TU/TB Manual
4.1.4 Comma nd Control
Some FRH-SD07TU/TB parameters can be changed by issuing commands from the terminal
equipment. Various applications can be supported with the flexibility that command control
offers.
Command Entry
• When a command is issued to the modem from the terminal equipment, a command
header (one byte character) should be used the modem to acknowledge the command
from ordinary data. The command header is initially set to “@” (40H) but can be
changed to another character by changing the value stored in the memory register
REG10.
• Commands must use all upper case letters (A to Z). The modem does not recognize
lower case letters (a to z) in commands.
• A two byte terminator (carriage return (0DH) + line feed (0AH)) is used to terminate a
command. “CR/LF” shows the terminator in this manual. PC can send this two byte
character with pressing ENTER key once using a communication software. But some
setting is necessary in the software.
• The modem immediately executes a command once it’s recognized. If the command
requires a response, the modem returns the response to the terminal equipment when
its internal processing is completed.
The following is an example of a command entry and response:
@BCL CR/LF :command issued from the terminal equipment
P0 CR/LF : successive completion response is returned
Rev. 050415-01.1