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PAGE 10
Electrical Characteristics
The data flow sequence is initiated when the first byte of data is received in the DI Buffer of the transmitting module
(WCM802 / WCM900 Module A). As long as WCM802 / WCM900 Module A is not already receiving RF data, data in the DI
Buffer is packetized, then transmitted over-the-air to WCM802 / WCM900 Module B.
Note: The WCM802 and the WCM900 modules are not compatible with each other and can not be used to
communicate with one another.
Timing Specifications
Table 1.4. AC Characteristics (SY parameter = 0, symbols correspond to Figure 1.2 and Figure 1.3.)
Symbol
Description
Latency from the time data is
T
TX
transmitted until received
Time that
T
TL
Time that RX LED pin is
T
RL
T
Channel Initialization Time
ST
Figure 1.2. System Block Diagram
Basic wireless link between hosts
Figure 1.3. Timing Specifications ("A" and "B" refer to Figure 1.2.)
19200 baud rate
(32 byte packet)
54.0 ms
/PWR pin is
8.4 ms
driven low
13.6 ms
driven high
35.0 ms
20 JUN 2005
19200 timing
(B=number of bytes)
For 0 < B < 64,
T = 41.6 + (0.4 * B) ms
For B > 63,
T = 66.8 ms
For 0 < B < 14,
T = 3.24 + (0.4 * B) ms
For B > 13,
T = 8.48 ms
For 0 < B < 65,
T = 0.79 + (0.408 * B)
For B > 64,
T = 26.9 ms
35.0 ms
WCM802/900
9600 baud rate
(32 byte packet)
(B=number of bytes)
T = 46.27 + (0.73 * B) ms
72.0 ms
T = 6.50 + (0.8 * B) ms
16.8 ms
T = 1.63 + (0.794 * B)
25.6 ms
35.0 ms
9600 timing
For 0 < B < 40,
For B >= 39 bytes,
T = 74.80 ms
For 0 < B < 14,
For B > 13,
T = 16.80 ms
For 0 < B < 37,
For B > 36,
T = 30.2 ms
35.0 ms
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