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4.5 Operating Mode Control Requests
This section describes the Ethernet Port operating modes and the procedures for controlling the
Ethernet Port operating mode from user programs on the T2N.
The Ethernet Port has the following operating modes:
(1) Initialization mode
• This mode indicates that the Ethernet Port is executing reset processing.
• If reset processing completes normally, the Ethernet Port switches to standby mode.
• If reset processing exits with an error (e.g., if a self test error occurs) the Ethernet Port
switches to down mode.
• During initialization, the Ethernet Port cannot execute requests from T2N user programs.
(2) Standby mode
• In this mode, Ethernet Port parameter can set up.
• Ethernet Port parameters cannot be set up in any mode other than standby mode.
• After the Ethernet Port parameters have been set up, the Ethernet Port can be switched to run
mode by T2N user program instructions.
(3) Run mode
• In this mode, the Ethernet Port can communicate with other ports.
• The Ethernet Port can be switched to standby mode by T2N user program instructions.
• In run mode, transfers using computer link/PC link protocol and transfers using the socket
interface can be independently enabled or disabled.
(4) Down mode
• This mode indicates that the Ethernet Port is in an unrecoverable error state.
• Once the Ethernet Port enters the down state, it can only be restored by turning the power off
(power cycling) and then on again.
• The details of the down mode state can be verified by reading the data in the T2N interface
buffer memory.
(See chapter 7, "RAS Information.")