B&B Electronics ADAM-4521 - Manual - Manual

S E R I A L C O M M U N I C A T I O N I N T E R F A C E F O R I N D U S T R I A L A U T O M A T I O N
ADAM-4521
Addressable RS-485 to RS-232 Converter with 1000 V
DC
Isolation
F e a t u r e s
Introduction
ADAM-4521 is an intelligent RS-485 to RS-232
converter specifically designed to connect RS-232
devices to an RS-485 network with other RS-485
devices. RS-232 is the most common transmission
standard. Although widely available on most computer
systems, measurement equipment, PLCs, and
industrial devices, its transmission speed, communi-
cation distance, and especially networking capability
are limited due to unbalanced transmission. The
ADAM-4521 addressable converter solves this
problem and lets you easily build up an RS-485
network with your RS-232 devices by assigning each
one an address for easier communication.
• Built-in microprocessor
• Transmission speeds of up to 115.2 kbps
• 1000 V
DC
isolation
• Surge protection on RS-485 line
• RS-232 and RS-485 can be set to different baud
rates
• Automatic RS-485 data flow control
• Watchdog timer function included
• Power and data flow indicator for troubleshooting
• Reserved space for termination resistor
• Software configurable to either addressable or non-
addressable mode
• Easily mounted on DIN rail, panel or piggyback
• All communication setups stored in EEPROM
Built-in Intelligence
ADAM-4521 is equipped with a built-in microproces-
sor, which uses two UARTs and automatically
processes data before transmitting it to the RS-232
device. This makes ADAM-4521 able to allow different
baud rates between RS-232 devices and the RS-485
network. The microprocessor also verifies whether the
data is transmitted with the appropriate address,
which enables each device on the RS-485 network to
communicate with your PC over long distances.
S p e c i f i c a t i o n s
• Transmission speed (bps): 300, 600, 1200, 2400,
4800, 9600, 19.2K, 38.4K, 57.6K, 115.2K (software
configurable)
Power requirement: Unregulated +10 to +30 V
DC
with protection from power reversals
Case: ABS with captive mounting hardware
Accessories (included): Nylon DIN-rail mounting
adapter, SECC panel mounting bracket
RS-232 interface connector: Female DB-9
RS-422/RS-485 interface connector: plug-in
screw terminal (accepts AWG 1-#12 or 2-#14~#22
(0.5 to 2.5mm
2 ) wires)
Operating temperature: -10 to 70°C
Dimension: 2.36" x 4.41" (60mm x 120mm)
Power consumption: 1 W
RS-485 Netw ork with Automatic Data
Flow Control
The RS-485 standard supports half-duplex
communication, meaning a single pair of wires is used
to both transmit and receive data. Handshaking
signals such as RTS (Request To Send) are normally
used to control the direction of the data flow, but a
special I/O circuit in the ADAM-4521 automatically
senses the direction of the data flow and switches the
transmission direction. No handshaking signals are
necessary.
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ADAM and the ADAM logo are trademarks of Advantech. Part No. 2003452100 3nd Edition Printed in Taiwan Aug. 2007