HAC-UM Series RF Module Manual SHENZHEN HAC TECHNOLOGY CO., LTD.
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7. The attentions of data transmission
a.
The delay time (tc) of conversion between transmitting and receiving is less than 1ms.
Timing diagram:
b.
The delay time of transceivers between the first bit sent by TxD to the first bit
received by RxD.
Due to a data processing will be made on user
’
s data by HAC-UM transceiver using FEC
(Forward Error Correction) or other correction algorithm, when RxD of a HAC-UM
transceiver
‘
A
’
receives the data, then transmits it, the other one transceiver
‘
B
’
will have a
delay (ts) to receive and transmit by TxD. Different RF data rate causes different delay time.
Please see the specific delay time below:
Rf
Date
Rate
（
bps
）
Delay
ts
（
ms
）
RF
Data
Rate
（
bps
）
Delay
ts
（
ms
）
1200
90
9600
12
2400
48
19200
6
4800
24
38400
3
Timing diagram:
c. Error dealing procedure:
To enhance the reliability and stability of user
’
s systems, a verify bit or a Cyclic Redundancy
Check (CRC) mode is highly recommended to resent the wrong information while using
HAC-UM series modules.
