Installation manual
CNC 8055
CNC 8055i
CONCEPTS
7.
SOFT: V02.2X
·411·
Open communication
7.21.1 Reception setting
Reception of a message begins and ends as follows:
Beginning of the reception of a message
As soon as the READ character is executed, it puts the characters in the message as they come
in. The variable RCVSTARTTI is set to 0, this causes the RCV instruction to receive characters as
soon as it is executed.
With this mode, parameter RCVENDTI (P12) of serial line 2 may be used as message reception
timeout.
End of the reception of a message
The READ instruction has several modes to end the reading of a message :
1. Message time :
The message ends after the time indicated in parameter RCVENDTI (P12) of serial line 2 has
elapsed since the beginning of the message. It starts counting as soon as the conditions to
receive the first character of the message are met.
RCVCTRL: bit2=1
RCVENDTI (P12) = time
2. Maximum number of characters:
Indicates the maximum number of characters to be received using parameter RCVMAXCAR
(P11) of serial line 2. When this number is reached, the message is considered completed. It
is used for protocols where the number of bytes received is always the same. It may be used
in combination with other systems.
3. Parity errors:
If the hardware detects a parity error in the characters, the message ends.
4. Via PLC program :
The message ends if bit 7 of variable RCVCTRL is set to 1.
7.21.2 Incompatibility with WINDNC via RS232
Having set an open communication via RS232 serial line, that line cannot be used to communicate
with the Windnc. To use Windnc at the same time, it must be used via the Ethernet line.
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