Serial Communications
8-21
Block Transfer Instructions
Block transfer operations with the 1203-GD1 communication module
require coordinated block transfer write (BTW) and block transfer
read (BTR) instructions to achieve successful data transmissions.
Rack – The number reported here should correspond to the
communication module’s rack assignment as selected via DIP switch
group one (SW1).
Group – The number reported here should correspond to the
communication module’s starting group address via DIP switch group
two (SW2), switches 1 and 2.
Module – In all cases (with regards to the 1203-GD1 communication
module) the number 0 should be reported here.
Control Block
①
– For this example a block transfer file type (BT) of
one element is used for the control block. An integer file (type N) of
five contiguous words could also be used.
Data File
①
– The first word of the data file (integer, Type N) selected
for the BTW or BTR block is reported here.
Length – The block transfer message length (number of words) is
reported here.
①
It is critical that care is given to all file assignments to ensure that no overlapping or overwriting
occurs.
BLOCK TRNSFR WRITE
Rack: 02
Group: 0
Module: 0
Control Block: BT11:0
Data File: N10:10
Length: 64
Continuous: N
BTW
(EN)
(DN)
(ER)
BLOCK TRNSFR WRITE
Rack: 02
Group: 0
Module: 0
Control Block: BT11:1
Data File: N10:90
Length: 64
Continuous: N
BTR
(EN)
(DN)
(ER)
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