Here for the Modbus master a delay time in ms is to be preset. With 0 the delay time is
evaluated automatically depending on the protocol with the following formula:
Modbus ASCII:
with Baudrate in bit/s
Modbus RTU:
with Baudrate in bit/s
In Modbus slave this parameter is ignored.
Option5: Delay time (high byte)
Option6: Delay time (low byte)
Range of values: 0 ... 60000 in ms
n
Default: 0
Via the Operating mode you may specify if the interface is operated in half-duplex
(RS485) or full-duplex (RS422) operation.
At half-duplex parameterization with RS485 software data flow control is
not possible.
Value
Description
00h
Half-duplex - Two-wire operation (RS485)
Data is exchanged between the communication partners but only in one direction at a time. In half-
duplex operation, therefore, at any one time data is being either sent or received.
01h
Full-duplex - Four-wire operation (RS422)
Data is exchanged between the communication partners in both directions simultaneously. In full-
duplex operation, therefore, data may be sent and received at the same time. Each communication
partner must operate simultaneously a receipt line.
Range of values:
00h: half-duplex
01h: full-duplex
n
Default: 00h
For a connection with minimum reflections and the break evaluation at RS422/485 opera-
tion, the lines may be preset with defined static voltage levels.
At the CP interface the wiring of the receiver is realized as follows:
OPTION5, 6: Delay time
OPTION15: Operating
mode
OPTION16: Line assign-
ment
VIPA System SLIO
Serial communication protocols
Modbus > Parameter data of Modbus
HB300 | CP | 040-1CA00 | en | 18-28
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