YASKAWA CP 040 RS422/485 Manual page 72

Serial communication protocols
3964(R) > Parameter data of 3964(R)
OPTION7: BWZ
OPTION8: STX repetitions
OPTION9: DBL
OPTION10: Priority
OPTION15: Operating
mode
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.
72
BWZ is the max. time between acknowledgement of a request telegram (DLE) and STX
of the answer telegram. The BWZ is specified in units of 20ms.
Range of values: 0 ... 255
n Default: 10
Maximum number of allowed attempts for the CP to establish a connection.
Range of values: 0 ... 255
n Default: 5
With exceeding the block waiting time (BWZ) you can set the maximum number of repeti-
tions for the request telegram by means of the parameter DBL. If these attempts are
unsuccessful, the transmission is interrupted.
Range of values: 0 ... 255
n Default: 6
A communication partner has a high priority when its transmit request supersedes the
transmit request of a partner. When the priority is lower, it must take second place after
the transmit request of the partner. The priorities of the two partners must be different for
the 3964(R) protocol. You may select one of the following settings:
Range of values: 00h: low
Range of values: 01h: high
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.
Range of values:
00h: half-duplex
01h: full-duplex
n Default: 00h
VIPA System SLIO
HB300 | CP | 040-1CA00 | en | 18-28