Computer Link with 3964(R) Transmission Protocol
S5-95U, Second Serial Interface
Characteristics of send and receive mailboxes:
•
In the first word of the send mailbox, the length of the data block to be sent must be specified
(in bytes). The data block length (word 1) is not transmitted. The remaining words of the send
mailbox are available for the data to be sent.
•
In the first word of the receive mailbox, the computer link automatically enters the number of
bytes received, followed by the receive data.
The location of the send and receive mailboxes can be parameterized in DB1 ( Section 3.4).
3-6
EWA 4NEB 812 6095-02