WI-MOD-9-D
Radio Modem
User Manual v1.9
WI-MOD-9-D
Manual
v 1.9
Page
38
transmission delay parameters in registers S18 and S19 (refer section 3.8). To disable this,
deselect the “PLC Mode” box in the Serial configuration window.
CRC Error Checking
It is normal for error checking to be disabled for transparent mode and enabled for controlled.
However you can select either for either mode. Refer to section 3 of this manual for a
description on the operation of error-checking.
Packet Size (bytes)
This selects the maximum number of bytes which will be transmitted in one message. If more
than this number of bytes is input into the WI-MOD-9-D, then the module will transmit more
than one message.
The default value is 530 bytes which is the largest packet value. If you are operating in a noisy
radio environment, then the system may be more reliable if you reduce the maximum packet size
and transmit a larger number of small messages rather than a lesser number of large messages.
Transmit and Receive Hold-off delay times
A “transmit delay” time and a “receive delay” time can be configured. These parameters may be
used to fine tune and give priority to different WI-MOD-9-D units in a system.
•
After each message is transmitted, a WI-MOD-9-D unit will not transmit another message
during the transmit delay time. This could be used to allow a reply message to be received
before the next message is sent.
•
After a message is received, a message will not be transmitted during the receive delay time.
This could be used to delay a reply message until other messages have been sent.
Serial Port settings
The serial port settings should be selected to match the host
device. Different port settings may be selected for different
modules in the same system.
Serial data rate can be selected between 1200 and 115,200
baud. If you select a rate which is slower than the radio rate,
the WI-MOD-9-D will automatically set transmission delay
parameters in registers S18 and S19 (refer section 3.8).
To disable this feature, deselect the “PLC Mode” box.
Then there will be no delay - data bytes will be transmitted
as soon as they appear in the input buffer.
The number of Data Bits can be selected as 7 or 8. The
number of stop bits can be 1 or 2. Parity can be none, even
or odd.
Flow Control
“Flow control” affects the use of the CTS and RTS signals on the RS232 port. These signals can
be used to prevent overflow of the input buffer or output buffer of the WI-MOD-9-D. The
settings should be selected to match the host device. The options for this setting are :
WI-MOD-9-D Configuration
