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EVM-900-DT

HumDT™ Series RF Transceiver Module

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Baud Rate Codes

Serial Baud Rate (kbps)

1.2

2.4

4.8

9.6

14.4

19.2

28.8

38.4

57.6

115.2

reserved

Baud Rate Code

0

1

2

3

4

5

6

7

8

9

N/A

Figure 25: Baud Rate Codes

As another example take the value 0x23. The high nibble is 2, so 2

channels are used. The low nibble is 3, which is a binary 0b0011, so

channels 0 and 1 are used.

Parameter 9 controls the transmitter output power level. Figure 26 shows

the power level codes and the approximate output power. The actual

output power may differ slightly from part-to-part.

Transmitter Output Power Codes

Power Level Code

00

01

02

03

04

05

06

07

08

HUM-900-DT

TX Output Power (dBm)

–30

–20

–15

–10

–5

0

5

7

10

Figure 26: Transmitter Output Power Codes

Parameters 10 through 13 set the ID of the network that the module is to

join. Other modules respond only if they have this same network ID.

– 28 –

Parameter 14 configures the GPIO lines to be either analog or digital.

The byte is a bit map with each bit corresponding to a single line; bit 0

corresponds to GPIO_0 and bit 7 corresponds to GPIO_7. Setting a bit to

0 makes that GPIO line digital and setting it to 1 makes the line analog.

Parameter 15 configures the GPIO lines to be either inputs or outputs.

The byte is a bit map with each bit corresponding to a single line; bit 0

corresponds to GPIO_0 and bit 7 corresponds to GPIO_7. Setting a bit

to 0 makes that GPIO line an input and setting it to 1 makes the line an

output. Note that analog lines can only be inputs.

Parameter 19 configures the GPIO lines to have either pull-up resistors to

VCC or pull-down resistors to ground. If this byte is set to 0 then all of the

GPIO lines have pull-up resistors. Any non-zero value configures the GPIO

lines to have pull-down resistors. Note that the tri-state configurations in

Parameter 20 take precedence over the resistors. If a line is configured to

be tri-state then the resistors are not used.

Parameter 20 configures the GPIO digital input lines to either use the

pull-up and pull-down resistors or to be tri-state. The byte is a bit map with

each bit corresponding to a single line; bit 0 corresponds to GPIO_0 and

bit 7 corresponds to GPIO_7. Setting a bit to 0 makes that GPIO line use

the pull-up / pull-down resistors as configured by Parameter 19. Setting it

to 1 makes the line tri-state, which is essentially having no resistors.

Setting an input to tri-state deactivates the resistors. This reduces the

overall current consumption by removing the current draw through the

20kΩ pulling resistors. However, input lines set as tri-state must be in a

determined state (high or low). They cannot be left floating or unpredictable

operation may occur.

Parameters 21 through 36 contain the 128-bit key for the AES encryption

algorithm. This key must be the same as all other modules on the network.

Parameter 55 indicates if the read command was successful (00) or if there

was an error (01).

– 29 –

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