ABB ARC600 User Manual page 70

Modbus application settings
Name
Parity
Stop bits
Use HW handshaking
(CTS/RTS)
Gateway mode
Gateway mode
Protocols
Serial protocol
Network protocol
Framing
Slave response time-
out
Table continues on the next page
70
Description
RTU communication uses 8 data bits and Modbus
ASCII communication uses 7 data bits.
Defines the parity method used in Modbus serial
communication. If set to "None", no parity method
is used. If set to "Even", an even parity bit is gener-
ated and inspected. If set to "Odd", odd parity bits
are generated and inspected.
Defines the number of stop bits used in Modbus
serial communication.
Enables CTS/RTS handshaking if set to "Yes".
If set to "Network master to serial slaves", the
slaves are on the serial side.
Defines the Modbus protocol that serial devices
use in serial communication. The possible settings
are Modbus RTU protocol and Modbus ASCII pro-
tocol. ModbusRTU is recommended because it is
more efficient.
Defines the TCP/IP and Modbus protocol used on
network communication. Possible protocols are
Modbus TCP protocol over TCP, Modbus RTU pro-
tocol over TCP, Modbus RTU protocol over UDP,
and Modbus ASCII protocol over UDP.
Defines the time in microseconds (millionths of
a second) how long the device waits for the re-
sponse from a Modbus slave. If the response is
not received, the device can generate and return
a Modbus gateway exception. The reply timeout
of the Modbus master must be greater than the
gateway device timeout.
Otherwise, the flow of request-reply communica-
tion is violated. The device does not accept a new
request before the reply from the slave is received
or the reply timeout is elapsed. The delays in net-
work communication can vary especially in wire-
less networks. When the slaves are located on the
network side, ping or another method should be
used to estimate the delay packets spend on net-
work.
1MRS758459 J
Value range
None, Even,
Odd
1, 2
No, Yes
Network master
to serial slaves
ModbusRTU,
ModbusASCII
ModbusTCP,
ModbusRTU
over TCP, Mod-
busRTU over
UDP, Modbu-
sASCII over TCP,
ModbusASCII
over UDP
0...90 000 000
(0...90 seconds)
ARC600
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