Restrictions; Communication Restrictions For Wired Side - Panasonic KR20 User Manual

1.3 Restrictions

1.3.1 Communication restrictions for wired side

Delimiter time of data by wired side
Wireless unit doesn't determine an end of wired data by control code such as "CR", and determine
by a blank time.
At initial setting, if there is the blank time for 10 characters, it is determined as the end of wired
data and wireless unit starts wireless communication. Therefore the data with blank more than the
time will be interrupted. Moreover, if the blank time between primary data and next data is less
than the time, two data are judged as one datum, and it is not likely to send correctly.
RS232C or RS485
Connecting direction of master and slave
(1:1 topology with repeaters, 1:N topology)
Please let the master side as command sending side, and the slave side as response sending side
because it is a communication procedure for requiring the command response. Cannot
communicate in inverse combination. And cannot use in communication system that both master
side and slave side sends the command.
Computer
Sequences of command and response
When using sequence of sending successive command, make the sequence that it send the next
command after receiving a response to the former command. When timeout period is set, it is
necessary to consider wireless communication time. Wireless communication time may become
long according to the surrounding communication environment, therefore there is a possibility that
collision of command and response is occurred when it send the next command after a fixed time
from the former command.
Communication protocol for 1:N topology
Communication protocol
MEWTOCOL
（Panasonic Electric Works Co., Ltd.）
MODBUS ASCII
MODBUS RTU
GT Series Original
（Panasonic Electric Works Co., Ltd.）
Message Runner Original
（Panasonic Electric Works Co., Ltd.）
*1:Now, it is not assured to operate by using PLC software.
*2:For other than the above communication protocol, please use as 1:1 topology or 1:1 topology
with repeater.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.ctiautomation.net - Email: info@ctiautomation.net
Max 2048 byte
Primary
Command
Master
RS485
name type
Available
Available
Available
Available
Available
Max 2048 byte
Next data
Delimiter time of wired side
(Initial 10 characters)
Command
Response
Slave
I/O type Restrictions
Available
・Data that is sent at
－
once don't exceed
－
2048byte
・It is possible to
－
extend the timeout
period
－
Response
Terminal
Remarks
*1
Cannot transfer
the screen
Cannot transfer
the screen
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