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T1 Timeout It is called
Intercharacter timeout and occurs when there is data to be received while receiving data string from SECS-I and the next data string does not arrive within T1 parameter setting time.

T2 Timeout Also known as
Control timeout, occurs when the corresponding response control character does not arrive within
T2 parameter setting time after sending Control character from SECS-I.

T3 Timeout
Transaction timeout, which occurs when a primary message is sent and a secondary message is not received within
within the T3 parameter setting time.

T4 Timeout
Block timeout.
This occurs when the next block data does not arrive within the T4 parameter setting time while receiving multiblock data from SECS-I.

T5 Timeout
After the socket is connected in HSMS, if you proceed with selection handshaking for the T5 parameter setting time and fail,
it is the time to disconnect and wait for the retry.

T6 Timeout
This is called Control timeout. It occurs when HSMS sends a control message such as selected.req and then does not receive a response message during the T6 parameter setting time.

T7 Timeout
Not Selected timeout. This error occurs when HSr does not receive a
selected.req message within the T7 parameter setting time after the Socket is connected to HSMS.

T8 Timeout: Occurs when the next character data is not received within the T8 parameter setting time after receiving the data string from the
HSMS.