User`s guide

86 DC 900-1339H
FMP Programmer’s Guide
4.13.3 Single Records
Note
The Single Records setting was added for compatibility with older
versions of FMP on embedded ICP boards. This setting is not rec-
ommended for high-speed or multiple-line use on Freeway
devices, as it generates more overhead on the Ethernet LAN.
On inbound messages with the Message Blocking option set to Single Records, FMP
strips out block check characters and all control characters including unit separators.
Also, each individual record is placed in a separate message buffer. This means that the
client program must issue a
dlRead for each record received. If a BCC error or other
receive error is detected within the record, an error code is placed in the Freeway error
field of the received buffer. Figure 4–11 is an example of the Single Records setting using
the sample received data blocks shown in Figure 4–6 on page 82.
The Single Records setting is not applicable to outbound messages. Messages that are
sent with this setting are formatted the same way as with the Data Records setting
(Section 4.13.2).
Figure 4–11: Message Blocking Example (Single Records)
A B C
Message Blocking = Single Records
Data Packing = Disabled
D E F
G H I
3266
J K L