Transmitting Messages From Gt - Panasonic GT02 Manual

5.2.2 Transmitting Messages From GT

[WDR] Send information on data area in word unit
Data in word unit is sent to a host computer from the GT.
Message
[SRR] Send information on single relay bit
The information on On/Off of relay is sent to a host computer from the GT.
Message
[WRR] Send information on relay in word unit
Data in the relay area in word unit is sent to a host computer from the GT.
Message
How to distinguish between message data and response data from the GT
When using the two-way communication mode, in some cases it is hard to distinguish between the
message sent from the GT and the response to the readout command sent from the external device
(WDR, SRR, WRR).
In order to distinguish them, adjust the numbers of words and contacts of the readout command sent
from the external device.
The GT sends 1-word message when the data format of the write destination that is specified in the
switch part or data part is 1 word.
When the format is 2 words, the GT sends 2-word message. It depends on the digit numbers for ASCII
of the data part.
Try to make the length of the message sent from the GT different from the length of the response to the
readout command sent from the external device, to enable to distinguish them according to the length.
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