Serial Communication Converters & Adapters Instruction Manual
8
PDA1485 P
RO
V
U
RS-485
Serial Adapter
Description
The PDA1485 converts the serial output of the
P
RO
V
U
meter to balanced, full or half-duplex RS-
485 signals.
The PDA1485 has a removable screw terminal
connector for the RS-485 terminals which
includes Transmit Data (DO) and (/DO), Receive
Data (DI) and (/DI), and Signal Ground. The
adapter is provided by the P
RO
V
U
meter M-Link
connection.
Baud rates are adjustable and handled by the
P
RO
V
U
(see the P
RO
V
U
Instruction Manual for
more details).
The PDA1485 has three diagnostic LEDs: a
Power (P) LED to show when the adapter is
powered properly, a Transmit Data (TX) LED to
show when the adapter is sending data out from
the PC side, and a Receive Data (RX) LED to
show when the adapter is receiving data from
the P
RO
V
U
meter.
Installation
Figure 4 shows the connection of a P
RO
V
U
meter to a PC using the PDA1485 serial adapter
and a PDA7485 RS-232 to RS-422/485
converter in an RS-422 network. The PDA1485
has an RJ45 connector to connect the Cat5e
cable and a screw terminal connector to connect
to the RS-422 network. Figure 5 shows the
connection of several P
RO
V
U
meters with
PDA1485 serial adapters to a PC using a
PDA7485 RS-232 to RS-422/485 converter in an
RS-485 network.
P
RO
V
U
Serial Communication
Address (
serIAl
)
When using more than one meter in a multi-drop
or multi-point mode, each meter must be
provided with its own unique address. For the
P
RO
V
U
meter the address may be programmed
from 001 to 247. The P
RO
V
U
meter is factory set
to address 001.
To change the P
RO
V
U
meter address:
1. Press and hold the
Menu
button for
three seconds to access Advanced
Features menu of the meter.
2. Press
Up
arrow until Serial (
SEriaL
)
menu is displayed and press
Enter
,
Addres
is displayed.
3. Press
Enter
to change meter address
using
Right
and
Up
arrow buttons.
Press
Enter
to accept.
4. Press
Menu
button to exit and return to
Run Mode.
Figure 4. RS-422 or RS-485 Wiring
Notes:
1. Termination resistors are optional and
values depend on the cable length and
characteristic impedance. Consult the
cable manufacturer for
recommendations.
2. Refer to RS-232 to RS-422/485
Converter documentation for further
details.
3. Use shielded cable, twisted-pairs plus
ground. Connect ground shield only at
one location.
