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23: M
ODEM
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23-2
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ONTROLLER
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ANUAL
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 (star t 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
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