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Serial Port Profiles

Modbus Slave IP Settings Field Descriptions

This window is used to configure the Modbus Slaves.

Idle Timeout Use this timer to close a connection because of inactivity. When the Idle

Timeout

expires, the IOLAN will end the connection.

Range: 0-4294967 seconds (about 49 days)

Default: 0 (zero), which does not timeout, so the connection is permanently

open.

Enable Modbus

Exceptions

When enabled, an exception message is generated and sent to the initiating

Modbus device when any of the following conditions are encountered: there is

an invalid UID, the UID is not configured in the Gateway, there is no free

network connection, there is an invalid message, or the target device is not

answering the connection attempt.

Default: Enabled

Character Timeout Used in conjunction with the Modbus RTU protocol, specifies how long to

wait, in milliseconds, after a character to determine the end of frame.

Range: 10-10000

Default: 30 ms

Message Timeout Time to wait, in milliseconds, for a response message from a Modbus TCP or

serial slave (depending if the Modbus Gateway is a Master Gateway or Slave

Gateway, respectively) before sending a Modbus exception.

Range: 10-10000

Default: 1000 ms

Session Strings Controls the sending of ASCII strings to serial devices at session start as

follows;

z Send at Start—If configured, this string will be sent to the serial device

on power-up of the IOLAN or when a kill line command is issued on this

serial port. If the "monitor DSR" or "monitor DCD" options are set, the

string will also be sent when the monitored signal is raised.

Range: 0-127 alpha-numeric characters

Range: hex 0-FF

z Delay after Send—If configured, will inset a delay after the string is sent

to the device. This delay can be used to provide the serial device with time

to process the string before the session is initiated or terminated.

Default: 10 ms

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Perle Systems Sds4 Manuel d'utilisateur Page 183