3
Description
The MDR210A-485 uses an embedded 100-milliwatt, frequency-hopping
wireless modem that provides communication between a local RS485 network
and a remote network of RS485 connected devices. The MDR210A-485 will
automatically sense the direction of data flow and switch the RS485 and Radio
devices accordingly. The MDR210A-485 can be placed in a network of RS485
devices and appear as a slave repeater of remote RS485 devices or it can be
placed in a network of one or many RS485 slaves and act as the RS485 repeater
of a remote master. The radio operates within the 900 MHz ISM Band under
Part 15 of the FCC Rules and Regulations.
The MDR210A-485 operates at 19200 Baud at either odd parity or no parity.
Dipswitches select parity and one of 7 radio networks. Radios operating together
must have the same radio network address (1-7 set by switches labeled A0-A2).
Select a different radio network address to prevent interference from nearby
networks that are not sharing information. The default radio network for Rooftop
applications is 5. The user may choose another network address (1-7) if desired.
While all radios in a network must have the same network address, they do not
have to have the same parity. The parity is local to the RS485 serial port on the
MDR210A-485 only. Parity information is not transmitted or received.
Radio network selection 0 (A0, A1, A2 all set to 0) selects a special network
setup. When network address setting 0 is selected, the pre-programmed radio
network parameters are used. These parameters are user and application
specific and must be set at the factory for specific OEM applications.
The MDR210A-485 can also be used as a general purpose RS485 half duplex
radio interface operating at 19200 Baud at either odd or no parity (dip switch
selectable).
PARAMETER
MIN
TYP
MAX
UNITS
Supply Voltage
6.0
12
24
Volts
Supply Current
70
-
200
mA
Baud Rate
-
19200
-
Baud
PIN
SIGNAL
DESCRIPTION
1
TR-
RS485 transmit/receive negative I/O
2
TR+
RS485 transmit/receive positive I/O
3
GND
Common
