AC4790-200A-485 Laird Technologies, AC4790-200A-485 Datasheet - Page 9

• Manufacturer Part Number: AC4790-200A-485
• Description: TXRX 900MHZ 3.3-5.5V FHSS 200MW
• Manufacturer: Laird Technologies
• Series: AeroCommr

Specifications of AC4790-200A-485

• Frequency: 902MHz ~ 928MHz
• Data Rate - Maximum: 115.2kbps
• Modulation Or Protocol: FHSS, FSK
• Applications: AMR, Fire & Security Alarms, Telemetry
• Power - Output: 5mW ~ 200mW
• Sensitivity: -110dBm
• Voltage - Supply: 3.3V, 5V
• Current - Transmitting: 68mA
• Data Interface: Connector, 2 x 10 Header
• Antenna Connector: On-Board, Chip
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Wireless Frequency: 900 MHz
• Interface Type: 20-pin mini connector
• Board Size: 49 mm x 42 mm x 5 mm
• Modulation: FHSS, FSK
• Security: 1 byte System ID, DES
• Operating Voltage: 3.3 V to 5.5 V
• Output Power: 200 mW
• Antenna: Integral and External Dipole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -
• Current - Receiving: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

P I N D E F I N I T I O N S
The AC4790 has a simple interface that allows OEM Host communications with the transceiver. The table below
shows the connector pin numbers and associated functions. The I/O direction is with respect to the transceiver. All
outputs are 3.3VDC levels and inputs are 5VDC TTL (with the exception of AC4790-1x1 and AC4790-1000 transceivers
which have 3.3V inputs). All inputs are weakly pulled High and may be left floating during normal operation (with the
exceptions listed for the AC4790-1x1).
Module
Pin
10
11
12
1
2
3
4
5
6
7
8
9
1x1
Pin
10
19
11
23
5
4
6
7
3
9
2
2
2
Type
GND
PWR
PWR
I/O
I/O
O
O
O
O
O
I
I
I
T a b l e 2 : A C 4 7 9 0 P i n D e f i n i t i o n s
RS485 B
RS485 A
(Invert)
Connect
Signal
Name
(True)
Do Not
VCC1
VCC2
GO0
GND
GO1
RXD
CTS
Test
TXD
RTS
GI0
www.lairdtech.com\wireless
1
1
Session status if Protocol Status is enabled. Otherwise, generic
output.
Transmitted data out of the transceiver
Non-inverted RS-485 representation of serial data
Data input to the transceiver
Mirror image of RS-485 A
Generic Input pin
Signal Ground
Has internal connection, for Laird Technology use only.
Clear to Send – Active Low when the transceiver is ready to accept
data for transmission.
Request to Send – When enabled in EEPROM, the OEM Host can
take this High when it is not ready to accept data from the
transceiver. NOTE: Keeping RTS High for too long can cause data
loss.
Received Acknowledge status pin if Protocol Status is enabled.
Otherwise, generic output.
AC4790-1x1: 3.3V, ±50mV ripple
AC4790-200: 3.3 – 5.5V, ±50mV ripple (Pin 10 is internally
connected to Pin 11)
AC4790-1000: 3.3 – 5.5V, ±50mV ripple
AC4790-1x1: 3.3V, ±50mV ripple
AC4790-200: 3.3 – 5.5V, ±50mV ripple (Pin 11 is internally
connected to Pin 10)
AC4790-1000: 3.3V ±3%, ±100mV ripple
Test Mode – When pulled logic Low and then applying power or
resetting, the transceiver’s serial interface is forced to a 9600, 8-N-1
rate. To exit, the transceiver must be reset or power-cycled with Test
Mode logic High.
Function
S P E C I F I C A T I O N S
5