User's Manual

E2-455 User Manual
Page 9 of 14
man_E2-455_V1-7.docx
[1] RX_CTS_OTH = 0
[1] RX_CTS_ME = 0 CTS to other / Me
[1] RX_ACK_OTH = 0
[1] RX_ACK_ME = 0 ACK to other / Me
[1] RX_UNSPRT = 0 Unsupported Frame Type
[1] RX_MULTI = 0 Multicast Frame
[1] RX_UNI_OTH = 0
[1] RX_UNI_ME = 0 Unicast message to other / Me
To count the number of received frames, add RX_RTS, RX_CTS, RX_ACK, RX_UNSPRT, RX_MULTI and RX_UNI types. When
testing with command “frm rad raw”, all received frame should be RX_UNSPRT.
 To Transmit BER Test frames (Default repeat is 8). BER frame length must be > 31 bytes to
allow valid testing.
> par len 131 (e.g. for 100 bytes of BER data for each test frame)
> par ber_num 3
[1] Radio BER frame number = 3
> frm rad ber
0:05:40.050 Tx : B 440.000 [65535] ( 60/ 52) D000 FFFFFFFFFFFF 0012AF000000
0:05:40.337 Tx : B 440.000 [65535] ( 60/ 52) D000 FFFFFFFFFFFF 0012AF000000
0:05:40.654 Tx : B 440.000 [65535] ( 60/ 52) D000 FFFFFFFFFFFF 0012AF000000
 To check BER at receiver (Over successfully received BER frames).
> stat ber clr Clear BER Statistics counters
> stat ber
[1] Frame number = 0 Number of Received BER frames
[1] Accumulated error bits = 0 Total over all received BER frames
[1] Total bits = 0 Total over all received BER frames
[1] Average RSSI = 0 dB Average over all received BER frames
[1] Average LQI = 0 Average over all received BER frames
4.2 Host Interface Message Framing
Message framing is based on PPP Byte stuffing. The special characters 0x7F, 0x7D and 0xFF are the
beginning of a frame, data link escape and end of frame characters respectively.
Each message begins with the transmission of the start of frame character. This is followed by the
message data payload for the message end of the message is indicated by the end of frame character.
Occurrence of the characters for start of frame, end of frame, or the data link escape character within
the data packet is indicated by stuffing an additional data link escape character into the data stream
before the special character and then setting bit 5 of the control character to 0.
Whenever the start flag character is detected, the framer state is reset to receiving the first data payload
byte. (Start flag should never occur in the data payload due to the escaping scheme above.)
The end of frame character ensures that the transmitter and receiver are synchronised at the beginning
of the next data frame. If they are not correctly synchronised, the 0xFF will result in the additional “ones”
being detected as a long stop condition at the receiver and subsequent characters being correctly
synchronised.
4.3 Host Interface Message Format
4.3.1 Endian
All multi-byte fields are transmitted in little endian format.