23: MODEM MODE
23-2 OPENNET CONTROLLER USER’S MANUAL
Applicable Modems
Any Hayes compatible modem can be used. Modems with a communications rate of 9600 bps or more between modems
are recommended. Use modems of the same make and model at both ends of the communication line.
Internal Relays for Modem Mode
When the modem mode is enabled, internal relays M8050 through M8107 are allocated to special functions. M8050-
M8056 (RS232C port 1) and M8080-M8086 (RS232C port 2) are used to send an AT command or disconnect the tele-
phone line. M8060-M8066 and M8070-M8076 (RS232C port 1) and M8090-M8096 and M8100-M8106 (RS232C port 2)
turn on to indicate the results of the command. M8057, M8067, and M8077 (RS232C port 1) and M8087, M8097, and
M8107 (RS232C port 2) are used to indicate the status of the RS232C port.
All completion and failure internal relays are turned off at the first scan in the modem mode.
Start and Result Internal Relays for RS232C Port 1
Start and Result Internal Relays for RS232C Port 2
When one of start internal relays M8050-M8056 or M8080-M8086 is turned on, a corresponding command is executed
once. To repeat the command, reset the start internal relay and turn the internal relay on again.
Completion or failure of a command is determined as described below:
Completion: The command is transmitted repeatedly as many as the retry cycles specified in data register D8209 or
D8309. When the command is completed successfully, the completion IR is turned on and the command
is not executed for the remaining cycles.
Failure: The command is transmitted repeatedly but failed in all trials as many as the retry cycles specified in data
register D8209 or D8309.
Status Internal Relays for RS232C Port 1 and Port 2
Note: While M8057/M8087 (AT command execution) is on, the OpenNet Controller cannot send and receive communica-
tion.
Mode Command Start IR Completion IR Failure IR Data Registers
Originate Mode
Initialization String M8050 M8060 M8070 D8245-D8269
ATZ M8051 M8061 M8071 —
Dialing M8052 M8062 M8072 D8270-D8299
Disconnect Mode Disconnect Line M8053 M8063 M8073 —
AT General Command Mode AT Command M8054 M8064 M8074 D8230-D8244
Answer Mode
Initialization String M8055 M8065 M8075 D8245-D8269
ATZ M8056 M8066 M8076 —
Mode Command Start IR Completion IR Failure IR Data Registers
Originate Mode
Initialization String M8080 M8090 M8100 D8345-D8369
ATZ M8081 M8091 M8101 —
Dialing M8082 M8092 M8102 D8370-D8399
Disconnect Mode Disconnect Line M8083 M8093 M8103 —
AT General Command Mode AT Command M8084 M8094 M8104 D8330-D8344
Answer Mode
Initialization String M8085 M8095 M8105 D8345-D8369
ATZ M8086 M8096 M8106 —
Port 1 Port 2 Status Description
M8057 M8087
AT Command
Execution
ON: AT command is in execution (start IR is on)
OFF: AT command is not in execution (completion or failure IR is on) (Note)
M8067 M8097
Operational
State
ON: Command mode
OFF: On-line mode
M8077 M8107
Line
Connection
ON: Telephone line connected
OFF: Telephone line disconnected
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
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