CAN communications: (continued)
PLUS+1 Service Tool signal (sensor
parameter)
Allowable values
Comments
SA:
235(0xEB), 236(0xEC), 237(0xED)
Default=235
Sensor_ID:
0- 536870911(0x00-0x1FFFFFFF)
Default=218084096(0xCFFB300)
RF communications:
PLUS+1 Service Tool signal (sensor
parameter)
Allowable values
Comments
Ch_Group(Channel Group Number):
1-7
Default=1
ClientNumber(Max Sensors):
1-10
Default=9
RFPowerLevel:
12,19
Default=12
ScanRate:
0-255
Default=3
The Ch_Group and ClientNumber parameters must be set on the CWH1000 before operation.
CWH1000 channel group number
The channel group number (Ch_Group) should be different from machine to machine. Each group has
two channels; this allows the wireless sensors to change channels in case one of the channels is getting
jammed.
It is important to choose channel group numbers that do not overlap with each other. If two running
machines are assigned the same channel group number, and are near enough to hear each other, they
will automatically sort out which machine gets which channel at the expense of losing their sensor's
channel hopping ability. If three or more wireless hubs are in the same area and using the same channel
group, the systems will interfere with each other and cause dropped packets and increased data latency.
To select the best channel, turn the CWH1000 on for 30 seconds in configuration mode. After 30 seconds,
the CWH1000 will notify you of the best channel to use. The CWH1000 automatically scans all the
channels for existing wireless sensor networks and returns the best channel with the least amount of
traffic. Since there are a total of 14 channels, it takes time to collect and calculate the best channel. The
byte structure is detailed in the programmer's manual. The operating channel group can be changed to
the best detected channel with either the PLUS+1® Serivce Tool or by sending CAN command messages
to the CWH1000. Further details are in the programmer's manual.
CWH1000 power level
For EU compliance, all devices are set to a lower power level by default. In North America, a higher power
level is allowed to get better range and noise rejection. The power level can be changed by either using
the PLUS+1® Service Tool or by sending a CAN command message. Further details are in the
programmers manual.
CWH1000 Max Sensor parameter
The maximum sensor (ClientNumber) parameter defines how many wireless sensors can be paired to a
single CWH1000. The minimum number is 0 and the maximum number is 10. If the number of paired
sensors is less than the Max Sensor number or if one of the wireless sensors is turned off, the CWH1000
will still transmit out the missing sensor’s respective CAN packets in run mode but will fill the data fields
with 0xFF to signify a missing sensor.
Technical Information
CWH1000 Wireless Hub
CWH1000 wireless communications
L1321661 • Rev AA • Mar 2014
13
