Perle Systems 5500208-41 User Manual download pdf (Page 21)

Modbus Commands

Set Modbus Gateway

Description Sets the Modbus parameters for the IOLAN when it is operating as a Modbus Gateway.

User Level Admin

Syntax

Options addr-mode

broadcast

char-timeout

req-next-delay

exceptions

idle-timer

mess-timeout

port

req-queuing

remapped-id

set modbus gateway [addr-mode embedded|re-mapped]

[broadcast on|off] [char-timeout <number>]

[req-next-delay <number>] [exceptions on|off]

[idle-timer <number>] [mess-timeout <number>]

[port <TCP/UDP_port>] [req-queuing on|off]

[remapped-id <1-247>]

Determines if the original UID address will be embedded in the transmission header or

if a specified (remapped) UID will be embedded in the transmission header.

When enabled, a UID of 0 (zero) indicates that the message will be broadcast to all

Modbus Slaves. The default is

Off.

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

milliseconds, after a character to determine the end of frame. The default is 30 ms.

A delay, in milliseconds, to allow serial slave(s) to re-enable receivers before issuing

next Modbus Master request. The default is 50 ms.

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. The

default is On.

Specifies the number of seconds that must elapse without any network or serial traffic

before a connection is dropped. If this parameter is set to 0 (zero), a connection will not

be dropped (with the following exceptions: the TCP KeepAlive causes the connection

to be dropped or the Modbus device drops the connection). The default is 10 seconds.

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. The default is 1000 ms.

The network port number that the Slave Gateway will listen on for both TCP and UDP

messages. The default is 502.

When enabled, allows multiple, simultaneous messages to be queued and processed in

order of reception. The default is

On.

Specify the UID that will be inserted into the message header for the Slave Modbus

serial device. Valid values are 1-247.

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Perle Systems 5500208-41 User Manual Page 21

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