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AC4490 Hardware Integration Guide
Baud Rate
BaudL (0x42)
28800
0xF8
19200
0xF4
14400
0xF0
9600
0xE8
4800
0xD0
2400
0xA0
1200
0x40
57600 is the default baud rate
1.
2.
0x00 yields a stop bit of 421 µSec. The stop bit at 1200 baud should be 833 µSec.
OEM Host Data Rate
The OEM host data rate is the rate with which the OEM host and transceiver communicate over the serial
interface. This rate is independent of the RF baud rate, which is fixed at 76.8 Kbps. Possible values range
from 1200 bps to 115200 bps.
R
I
ADIO
NTERFACE
Protocol Status / Receive Acknowledgement
Note: Implemented in firmware v6.3 and later.
When enabled in EEPROM, GO0 and GO1 perform the functions of Protocol Status and Receive
Acknowledgement.
Protocol Status
Every time the radio hops to hop bin 0, the radio asserts GO0 Low for the entire hop bin. GO0 goes low at
the falling edge of the hop frame at the start of bin 0 and goes high with the rising edge of hop frame at the
end of bin 0. During all other hops, GO0 is high.
Note: This mode is incompatible with Modem mode.
Receive Acknowledgement
The radio uses GO1 to signal that a valid RF acknowledgement has been received from the remote radio.
GO1 is normally low and goes high within approximately 75 µSec of receiving a valid RF acknowledgement. It
remains high until the end (rising edge) of the next hop.
Note: This mode is incompatible with Modem mode.
Flow Control
CTS On/CTS On Hysteresis (Flow Control)
Flow control refers to the control of data flow between transceivers. It is the method used to handle data in
the transmit/receive buffer and determines how data flow between the transceivers is started and stopped.
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/ramp
Minimum Interface
BaudH (0x43)
Timeout (0x58)
0x00
0x02
0x00
0x03
0x00
0x04
0x00
0x05
0x00
0x09
0x00
0x11
0x00
0x21
© Copyright 2016 Laird. All Rights Reserved
Stop Bit Delay
(0x3F)
0x0E
0x19
0x23
0x39
0x7A
0xFC
0x00
2
16
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Europe: +44-1628-858-940
Hong Kong: +852 2923 0610
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