● In the case of SCU, data received from the partner are stored in 8 receive buffers for each
COM port. By executing the GPRECV instruction, data in the receive buffer can be copied to
a given operation memory.
● In the case of CPU with built-in ET-LAN, data received from the partner are stored in 1
receive buffer for each connection. By executing the GPRECV instruction, data in the receive
buffer can be copied to a given operation memory.
■
Amount of received data and end code
Items SCU In the case of CPU with built-in ET-
LAN
Number of received
data
0 to 4096
(Note 1)
0 to 16384
End code
identification
Yes (according to the SCU communication
settings (end settings))
No identification
(Note 1) For SCU, up to 4096 bytes can be sent, including a start code and an end code. The start code and
end code are set from the configuration menu of the tool software or with the PMSET instruction.
When "Start code STX" is set to "Enabled", the maximum amount of sent data that can be specified is
decremented by one.
When "Terminator setting" is set to "ETX" or "CR", the maximum amount of sent data is decremented
by one.
When "Terminator setting" is set to "CR+LF", the maximum amount of sent data is decremented by
two.
When "Terminator setting" is set to "Time", the maximum amount of sent data is not decremented.
■
Storage method for received data
----- -----
Received data are stored in ascending order from lower bytes.
DT200
H32(2) H31(1)
H34(4) H33(3)
----- H35(5)
----- -----
DT201
DT202
DT203
DT204
Received number of bytes are stored.
U5
-----
If the number of received bytes is smaller than the area
specified by the GPRECV instruction, the value is not
overwritten.
● The case of SCU shows the case that it is used in the following combination.
• COM.0 port equipped in the CPU unit
• Communication cassettes attached to the CPU unit (COM.1 to COM.2 ports)
• Communication cassettes attached to the serial communication unit (COM.1 to COM.4
ports)
● As the communication cassette (Ethernet type) has an Ethernet-serial conversion function, the
internal interface operates with similar programs as the case of SCU. The setting method and
programming method are different from those for the CPU with built-in ET-LAN.
15.3 GPRECV (General-Purpose Communication Receive Instruction)
15-16 WUME-FP7CPUPGR-12
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