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PRECISION DIGITAL CORPORATION
89 October Hill Road • Holliston MA 01746 USA
Tel (800) 343-1001 • Fax (508) 655-8990
www.predig.com
SERIAL COMMUNICATION
CONVERTERS & ADAPTERS
Instruction Manual
• RS-232 to RS-422/485 Converter
• Isolated RS-232 to RS-422/485 Converter
• USB to RS-232 Converter
• USB to RS-422/485 Converter
• Isolated USB to RS-422/485 Converter
• Trident RS-232 & RS-485 Multi-Input Isolated Adapter Board
• Trident Serial Communication RS-232 Adapter
• Trident Serial Communication RS-422/485 Adapter
• P
ROVU Serial Communication RS-232 Adapter
• PROVU Serial Communication RS-422/485 Adapter
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Serial Communication Converters & Adapters Instruction Manual
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Disclaimer
The information contained in this document is subject to change without
notice. Precision Digital makes no representations or warranties with
respect to the contents hereof, and specifically disclaims any implied
warranties of merchantability or fitness for a particular purpose.
Registered Trademarks
MeterView® and ConsoliDator® are registered trademarks of Precision
Digital Corporation, Modbus
®
is a registered trademark of Schneider
Automation Inc. All other trademarks mentioned in this document are
the property of their respective owners.
© 2008 Precision Digital Corporation. All rights reserved.
ORDERING INFORMATION
Model Description
PDA1200
ProVu Meter Copy Cable, 3' (0.9 m)
PDA1232
ProVu RS-232 Serial Adapter
PDA1485
ProVu RS-422/485 Serial Adapter
PDA7420
Trident Meter Copy Cable, 7' (2.1 m)
PDA7232
Trident RS-232 Serial Adapter, PDA7420 included
PDA7422
Trident RS-422/485 Serial Adapter, PDA7420 included
PDA7485-I
RS-232 to RS-422/485 Isolated Converter
PDA7485-N
RS-232 to RS-422/485 Non-Isolated Converter
PDA7488
Trident RS-232 & RS-485 Isolated Multi-Input Adapter
PDA8232-N
USB to RS-232 Non-Isolated Converter
PDA8485-I
USB to RS-422/485 Isolated Converter
PDA8485-N
USB to RS-422/485 Non-Isolated Converter
MeterView®
MeterView® Software for Trident Meters
FREE Download available at
www.predig.com/meterview
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Serial Communication Converters & Adapters Instruction Manual
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SAFETY INFORMATION
!
CAUTION: Read complete
instructions prior to installation and operation of the
equipment.
WARNING: Risk of
electric shock.
WARNING
Hazardous voltages could exist on serial communication wiring
networks. Installation and service should be performed only by
trained service personnel.
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Serial Communication Converters & Adapters Instruction Manual
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Table of Contents
ORDERING INFORMATION --------------------------------------------- 2
SAFETY INFORMATION ------------------------------------------------- 3
SPECIFICATIONS ---------------------------------------------------------- 7
PDA1232 PROVU RS-232 Serial Adapter ---------------------------------- 7
PDA1485 PROVU RS-422/485 Serial Adapter ---------------------------- 7
PDA7232 Trident RS-232 Serial Adapter ---------------------------------- 7
PDA7422 Trident RS-422/485 Serial Adapter ---------------------------- 8
PDA7485 RS-232 to RS-422/485 Converter ------------------------------ 8
PDA7488 Trident RS-232 & RS-485 Multi-Input Adapter ------------- 9
PDA8232 USB to RS-232 Converter ---------------------------------------- 9
PDA8485 USB to RS-422/485 Converter -------------------------------- 10
SERIAL COMMUNICATIONS OVERVIEW ------------------------- 11
PDA1232 PROVU RS-232 SERIAL ADAPTER --------------------- 13
Description ----------------------------------------------------------------------- 13
Installation ------------------------------------------------------------------------ 14
Connections -------------------------------------------------------------------- 15
PROVU Serial Communication Address (serial) -------------------- 15
PDA1485 PROVU RS-422/485 SERIAL ADAPTER --------------- 16
Description ----------------------------------------------------------------------- 16
Installation ------------------------------------------------------------------------ 17
PROVU Serial Communication Address (serIAl) -------------------- 17
Connections -------------------------------------------------------------------- 20
PDA7232 TRIDENT RS-232 SERIAL ADAPTER ----------------- 21
Description ----------------------------------------------------------------------- 21
Installation ------------------------------------------------------------------------ 22
Connections -------------------------------------------------------------------- 23
PD765 Serial Communication Address (serl) ------------------------ 23
PDA7422 TRIDENT RS-422/485 SERIAL ADAPTER ----------- 24
Description ----------------------------------------------------------------------- 24
Installation ------------------------------------------------------------------------ 25
PD765 Serial Communication Address (serl) ------------------------ 25
Connections -------------------------------------------------------------------- 28
PDA7485 RS-232 TO RS-422/485 CONVERTER ----------------- 29
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Description ----------------------------------------------------------------------- 29
Installation ------------------------------------------------------------------------ 30
Connections -------------------------------------------------------------------- 32
PDA7488 TRIDENT RS-232 & RS-485 MULTI-INPUT
ADAPTER ------------------------------------------------------------------- 33
Description ----------------------------------------------------------------------- 33
Installation ------------------------------------------------------------------------ 34
Mounting ------------------------------------------------------------------------ 34
PD765 Serial Communication Address (serl) ------------------------ 34
Connections -------------------------------------------------------------------- 36
PDA8232 USB TO RS-232 CONVERTER -------------------------- 37
Description ----------------------------------------------------------------------- 37
Installation ------------------------------------------------------------------------ 38
PDA8485 USB TO RS-422/485 CONVERTER --------------------- 39
Description ----------------------------------------------------------------------- 39
Installation ------------------------------------------------------------------------ 40
Connections -------------------------------------------------------------------- 41
TROUBLESHOOTING ---------------------------------------------------- 43
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Table of Figures
Figure 1. General Four-Wire Network Connection .......................... 12
Figure 2. General Two-Wire Network Connection ........................... 12
Figure 3. RS-232 Adapter Connections ............................................ 14
Figure 4. RS-422 or RS-485 Wiring ................................................... 18
Figure 5. RS-485 Two-Wire Multi-Drop Wiring ................................. 19
Figure 6. Connections for PDA1485 to Serial Converter ................. 20
Figure 7. RS-232 Adapter Connections ............................................ 22
Figure 8. Standard Modular Cable Wiring ........................................ 23
Figure 9. RS-422 or RS-485 Wiring ................................................... 26
Figure 10. RS-485 Two-Wire Multi-Drop Wiring ............................... 27
Figure 11. Standard Modular Cable Wiring ...................................... 28
Figure 12. Connections for PDA7422 to Serial Converter ............... 28
Figure 13. PDA7485 Terminal Connectors and DIP Switch ............ 30
Figure 14. PDA7485 DIP Switch Settings ......................................... 30
Figure 15. RS-485 Two-Wire Multi-Drop Wiring ............................... 31
Figure 16. Connections for PDA7485 in a Four-Wire Network ....... 32
Figure 17. Connections for PDA7485 in a Two-Wire Network ........ 32
Figure 18. PDA7488 Mounting ........................................................... 34
Figure 19. RS-422 or RS-485 Wiring ................................................. 35
Figure 20. Standard Modular Cable Wiring ...................................... 36
Figure 21. Connections for PDA8232 to serial device ..................... 38
Figure 22. PDA8485 DIP Switch Location ......................................... 40
Figure 23. PDA8485 DIP Switch Settings ......................................... 40
Figure 24. Connections for PDA8485 in a Four-Wire Network ....... 41
Figure 25. Connections for PDA8485 in a Two-Wire Network ........ 41
Figure 26. RS-485 Two-Wire Multi-Drop Wiring ............................... 42
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SPECIFICATIONS
PDA1232 PROVU RS-232 Serial Adapter
COMPATIBILITY EIA-232
CONNECTORS PC compatible 9-pin D subminiature connector (DB9) and
RJ45 (adapter to meter)
CABLE 6' (1.8 m) standard Cat5e cable provided with adapter
DISTANCE Adapter to PROVU meter: 6' (1.8 m) max; Adapter to com-
puter: 50' (15 m) max; serial interface cable not provided
POWER Powered by PROVU meter M-Link connection
STATUS
INDICIATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
PDA1485 PROVU RS-422/485 Serial Adapter
COMPATIBILITY EIA-422 and EIA-485
CONNECTORS Removable screw terminal connector and RJ11 (adapter to
meter)
CABLE 6' (1.8 m) standard Cat5e cable provided with adapter
DISTANCE Adapter to to PROVU meter: 6' (1.8 m) max; Adapter to com-
puter: 3,937' (1,200 m) max
POWER Powered by PROVU meter M-Link connection
STATUS
INDICIATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
PDA7232 Trident RS-232 Serial Adapter
COMPATIBILITY EIA-232
CONNECTORS PC compatible 9-pin D subminiature connector (DB9) and
RJ11 (adapter to meter)
CABLE 7' (2.1 m) standard modular cable provided with adapter
DISTANCE Adapter to PD765 meter: 7' (2.1 m) max; Adapter to com-
puter: 50' (15 m) max; serial interface cable not provided
POWER Powered by Trident PD765 RJ11 connection
STATUS
INDICIATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
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PDA7422 Trident RS-422/485 Serial Adapter
COMPATIBILITY EIA-422 and EIA-485
CONNECTORS Removable screw terminal connector and RJ11 (adapter to
meter)
CABLE 7' (2.1 m) standard modular cable provided with adapter
DISTANCE Adapter to PD765 meter: 7' (2.1 m) max; Adapter to com-
puter: 3,937' (1,200 m) max
POWER Powered by Trident PD765 RJ11 connection
STATUS
INDICIATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
PDA7485 RS-232 to RS-422/485 Converter
COMPATIBILITY EIA-232, EIA-422, and EIA-485
CONNECTORS Screw terminal connector and DB9
DISTANCE RS-232 connection: 50' (15 m) max; RS-422/485 connec-
tion: 3,937' (1,200 m) max
NUMBER OF
UNITS
Up to 31 RS-485 compatible devices
POWER 9-12 VDC; 115 VAC/12 VDC adapter included
STATUS
INDICIATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
ISOLATION PDA7485-I: 1500 VAC between data lines; 700 VDC
input/output-to-power
PDA7485-N: 1500 VAC between data lines only
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PDA7488 Trident RS-232 & RS-485 Multi-Input Adapter
COMPATIBILITY EIA-232, EIA-422, and EIA-485
CONNECTORS Screw terminal connector, RJ11, and DB9
CABLE Six 3.5' (1 m) standard modular cables provided with adap-
ter
DISTANCE Adapter board to PD765 meter: 7' (2.1 m) max; RS-232
connection: 50' (15 m) max; RS-422/485 connection: 3,937'
(1,200 m) max
NUMBER OF
UNITS
Up to 6 Trident meters
POWER Powered by 1 PD765 RJ11 connection
STATUS
INDICIATION
Separate LEDs for power (POWER), transmit (DATA OUT),
and receive (DATA IN)
ISOLATION 1500 VAC input-to-output, TX-to-RX line;
500 VAC meter-to-meter
DIMENSIONS 4.0" x 5.5" x 0.9" (H x W x D)
PDA8232 USB to RS-232 Converter
COMPATIBILITY USB 1.1, USB 2.0, EIA-232
CONNECTORS PC compatible 9-pin D subminiature connector (DB9) and
USB Type A
DRIVERS Windows® 98/2000/ME/XP
DISTANCE USB connection: 10' (3 m) max; RS-232 connection: 50'
(15m) max
POWER USB port
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PDA8485 USB to RS-422/485 Converter
COMPATIBILITY USB 1.1, USB 2.0, EIA-422, and EIA-485
CONNECTORS Screw terminal connector and USB Type B
DRIVERS Windows® 98/2000/ME/XP, Linux 2.4 & greater
DISTANCE USB connection: 10' (3 m) max; RS-422/485 connection:
3,937' (1,200 m) max
NUMBER OF
UNITS
Up to 31 RS-485 compatible devices
POWER USB port
STATUS
INDICIATION
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
ISOLATION PDA8485-I: 1500 VAC between data lines; 700 VDC
input/output-to-power
PDA8485-N: 1500 VAC between data lines only
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SERIAL COMMUNICATIONS OVERVIEW
RS-232, RS-422, and RS-485 are standard interfaces approved by the
Electronic Industries Alliance (EIA) for connecting serial devices. In EIA
terms, the device (e.g. meter) that connects to the interface is called a
Data Communications Equipment (DCE) and the device to which it connects (e.g. the computer) is called a Data Terminal Equipment (DTE).
The RS-422 standard was designed to replace the older RS-232 standard because it supports higher data rates and greater immunity to electrical interference. RS-485 is similar to RS-422 but can support multipoint connections per line because it uses lower-impedance drivers and
receivers.
Line drivers and receivers are used to exchange data between two or
more points (nodes) on a serial communications network. Reliable data
communications can be difficult in the presence of induced noise,
ground level differences, and other hazards associated with installation
of a network. When communicating at high data rates, or over long distances in real world environments, RS-232 is often inadequate. The
differential data transmission of RS-422 and RS-485 offers superior
performance in most applications. Differential signals can help nullify the
effects of ground shifts and induced noise signals that can appear as
common mode voltages on a network.
RS-422 was designed for greater distances and higher baud rates than
RS-232. In its simplest form, a pair of converters from RS-232 to
RS-422 (and back again) can be used to form an "RS-232 extension
cord". Data rates of up to 100 kbits/second and distances of 3,937'
(1,200 m) can be accommodated with RS-422.
RS-422 devices however cannot be used to construct a true multi-point
network. A multi-point network consists of multiple drivers and receivers
connected on a single bus, where any point (node) can transmit and/or
receive data. RS-485 is an enhanced version of the RS-422 standard,
which allows multiple drivers and receivers on the same two-wire or
four-wire system. The RS-485 standard specifies up to 32 drivers and
32 receivers on a single bus, but with the introduction of "automatic"
repeaters and high-impedance drivers/receivers, this number can be
extended to hundreds of points (nodes) on a network.
The cabling used for an RS-422 or RS-485 serial communications
network should always be a high quality cable such as Belden 8162 or
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Alpha 6203C. A two-wire system requires two twisted pairs, and a fourwire system requires three twisted pairs (the extra twisted pair is
needed for the signal ground).
Figure 1 illustrates how to connect a general four-wire network (a fourwire network actually contains 5 wires).
PDA8485
DO
DO
DI
DI
GND
DO
DO
DI
DI
GND
RS-422/485 DEVICE
Figure 1. General Four-Wire Network Connection
Figure 2 illustrates how to connect a general two-wire network (a twowire network actually contains 3 wires). Note that the PDA7485 and
PDA8485 have DIP switches that allow for two-wire connections without
the need to externally wire the DO to the DI and the /DO to the /DI (see
the converter section for complete details).
PDA8485
DATA
DATADO
DO
DI
DI
GND
GND
RS-485 DEVICE
Figure 2. General Two-Wire Network Connection
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PDA1232 PROVU RS-232 SERIAL ADAPTER
P R E C IS IO N D IG IT A L
Description
The PDA1232 converts the serial output of the PROVU meter to an un-
balanced, full-duplex RS-232 signal.
The RS-232 port has a female DB9 connector with pins 2 (RX output),
3 (TX input), and 5 (Signal Ground). Pins 7 (RTS) and 8 (CTS) are tied
together, and pins 1 (CD), 4 (DTR), and 6 (DSR) are tied together. The
adapter is powered by the P
ROVU meter M-Link connection.
Baud rates are adjustable and handled by the PROVU (see the PROVU
Instruction Manual for more details).
The PDA1232 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 PROVU meter.
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Installation
Figure 3 shows the connection of a PROVU meter to a PC using the
PDA1232 serial adapter. The PDA1232 has an RJ45 connector to connect the Cat5e cable and a PC compatible 9-pin D subminiature connector (DB9). The DB9 can be connected directly to the PC or by using
a standard serial extension cable.
Cat5e Cable
(Provided)
RS-232 Adapter
Serial
Cable
(Not Provided)
Figure 3. RS-232 Adapter Connections
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Connections
A Cat5e cable is provided to connect the P
ROVU meter to the PDA1232
serial adapter.
P
ROVU Serial Communication Address (serial)
For the P
ROVU Trident meter the address may be programmed from 001
to 247. The P
ROVU meter is factory set to address 001.
To change the P
ROVU meter address:
1. Press and hold the Menu button for three seconds to access Ad-
vanced 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.
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PDA1485 PROVU RS-422/485 SERIAL ADAPTER
P R E C IS IO N D IG IT A L
DI
DI
DO
DO
Description
The PDA1485 converts the serial output of the PROVU meter to ba-
lanced, full or half-duplex RS-422 or RS-485 signals.
The PD1485 has a removable screw terminal connector for the
RS-422/485 terminals which includes Transmit Data (DO) and (/DO),
Receive Data (DI) and (/DI), and Signal Ground. The adapter is provided by the P
ROVU meter M-Link connection.
Baud rates are adjustable and handled by the PROVU (see the PROVU
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 PROVU meter.
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Installation
Figure 4 shows the connection of a PROVU 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 PROVU
meters with PDA1485 serial adapters to a PC using a PDA7485 RS-232
to RS-422/485 converter in an RS-485 network.
P
ROVU 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
ROVU meter the address may be programmed from 001 to 247. The
P
ROVU meter is factory set to address 001.
To change the P
ROVU meter address:
1. Press and hold the Menu button for three seconds to access Ad-
vanced 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.
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Shield
PDA7485
RS-232 to RS-485
Converter
RS-232 Serial
Connections
to PC
R
R
Twisted-Pair
Cat5e Cable to
Meter
(Provided)
PDA1485
RS-422/485
Adapter
DI
DI DO DO
DI
DI
DO
DO
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.
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PDA7485
RS-232 to RS-485
Converter
RS-232 Serial
Connections
to PC
Last Adapter
R
Shield
Twisted-Pair
R
DI
DI DO DO
DI
DI DO DO
Cat5e Cable to
Meter
(Provided)
Adapter #1
PDA1485
RS-422/485
Adapter
DI
DI
DO
DO
Figure 5. RS-485 Two-Wire Multi-Drop 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-485 Converter documentation for further details.
3. Use shielded cable, twisted-pair plus ground. Connect ground shield
only at one location.
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Serial Communication Converters & Adapters Instruction Manual
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Connections
A Cat5e cable is provided to connect the P
ROVU meter to the PDA1485
adapter.
Figure 6 details the wiring connections from the PDA1485 to an
RS-422/485 serial converter (such as the PDA7485 or PDA8485) for a
four-wire network.
Figure 6. Connections for PDA1485 to Serial Converter
If the serial converter is configured for a two-wire network then the requirement to externally wire the DO to the DI and the /DO to the /DI on
the PDA1485 screw terminal connector is needed.
PDA1485 to RS-422/485 Serial
Converter Connections
RS-422/485
Serial Converter
PDA1485
RS-422/485 Adapter
DO DI
DO DI
DI DO
DI DO
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Serial Communication Converters & Adapters Instruction Manual
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PDA7232 TRIDENT RS-232 SERIAL ADAPTER
P R E C IS IO N D IG IT A L
Description
The PDA7232 converts the serial output of the PD765 Trident meter to
an unbalanced, full-duplex RS-232 signal.
The RS-232 port has a female DB9 connector with pins 2 (RX output),
3 (TX input), and 5 (Signal Ground). Pins 7 (RTS) and 8 (CTS) are tied
together, and pins 1 (CD), 4 (DTR), and 6 (DSR) are tied together. The
adapter is powered by the PD765 Trident meter.
Baud rates are adjustable and handled by the PD765 (see the Trident
Instruction Manual for more details).
The PDA7232 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 Trident PD765 meter.
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Installation
Figure 7 shows the connection of a Trident meter to a PC using the
PDA7232 serial adapter. The PDA7232 has an RJ11 connector to connect the PDA7420 modular cable and a PC compatible 9-pin D subminiature connector (DB9). The DB9 can be connected directly to the PC
or by using a standard serial extension cable.
PDA7420
Modular Cable
(Provided)
RS-232 Adapter
Serial
Cable
PR EC IS ION D IGIT AL
(Not Provided)
Figure 7. RS-232 Adapter Connections
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Serial Communication Converters & Adapters Instruction Manual
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Connections
A PDA7420 cable is provided to connect the Trident meter to the
PDA7232 serial adapter. Figure 8 shows the PDA7420 cable details.
(WH) 1
(BK) 2
(R) 3
(G) 4
(Y) 5
(BL) 6
1
2
3
4
5
6
Figure 8. Standard Modular Cable Wiring
PD765 Serial Communication Address (serl)
For the PD765 Trident meter the address may be programmed from 00
to 99 for PDC Protocol and from 1 to 247 for Modbus RTU. The PD765
Trident meter is factory set to PDC Protocol at address 00.
To change the PD765 Trident meter address:
1. Press and hold Right arrow and Menu buttons for three
seconds to access Advanced Features menu of the meter.
2. Press Up arrow until Serial (SErL) menu is displayed and press
Enter/Ack, Addr is displayed.
3. Press Enter/Ack to change meter address using Right and Up
arrow buttons. Press Enter/Ack to accept.
4. Press Menu button to exit and return to Run Mode.
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PDA7422 TRIDENT RS-422/485 SERIAL ADAPTER
P R E C IS IO N D IG IT A L
DI
DI
DO
DO
Description
The PDA7422 converts the serial output of the PD765 Trident meter to
balanced, full or half-duplex RS-422 or RS-485 signals.
The PD7422 has a removable screw terminal connector for the
RS-422/485 terminals which includes Transmit Data (DO) and (/DO),
Receive Data (DI) and (/DI), and Signal Ground.
Baud rates are adjustable and handled by the PD765 (see the Trident
Instruction Manual for more details).
The PDA7422 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 Trident PD765 meter.
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Installation
Figure 9 shows the connection of a Trident meter to a PC using the
PDA7422 serial adapter and a PDA7485 RS-232 to RS-422/485 converter in an RS-422 network. The PDA7422 has an RJ11 connector to
connect the PDA7420 modular cable and a screw terminal connector to
connect to the RS-422 network. Figure 10 shows the connection of several Trident meters with PDA7422 serial adapters to a PC using a
PDA7485 RS-232 to RS-422/485 converter in an RS-485 network.
PD765 Serial Communication Address (serl)
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
PD765 Trident meter the address may be programmed from 00 to 99 for
PDC Protocol and from 1 to 247 for Modbus RTU. The PD765 Trident
meter is factory set to PDC Protocol at address 00.
To change the PD765 Trident meter address:
1. Press and hold Right arrow and Menu buttons for three
seconds to access Advanced Features menu of the meter.
2. Press Up arrow until Serial (SErL) menu is displayed and press
Enter/Ack, Addr is displayed.
3. Press Enter/Ack to change meter address using Right and Up
arrow buttons. Press Enter/Ack to accept.
4. Press Menu button to exit and return to Run Mode.
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Serial Communication Converters & Adapters Instruction Manual
26
Shield
PDA7485
RS-232 to RS-485
Converter
RS-232 Serial
Connections
to PC
R
R
Twisted-Pair
Modular Cable to
Meter (Provided)
PDA7422
RS-422/485
Adapter
DI
DI DO DO
DI
DI
DO
DO
P R E C IS IO N D IG IT A L
Figure 9. 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.
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Serial Communication Converters & Adapters Instruction Manual
27
PDA7485
RS-232 to RS-485
Converter
RS-232 Serial
Connections
to PC
Last Adapter
R
Shield
Twisted-Pair
R
DI
DI DO DO
DI
DI DO DO
Modular Cable to
Meter (Provided)
Adapter #1
PDA7422
RS-422/485
Adapter
DI
DI
DO
DO
P R E C IS IO N D IG IT A L
PRECISION DIGITAL
Figure 10. RS-485 Two-Wire Multi-Drop 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-485 Converter documentation for further details.
3. Use shielded cable, twisted-pair plus ground. Connect ground shield
only at one location.
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Serial Communication Converters & Adapters Instruction Manual
28
Connections
A PDA7420 cable is provided to connect the Trident meter to the
PDA7422 adapter. Figure 11 shows the PDA7420 cable details.
(WH) 1
(BK) 2
(R) 3
(G) 4
(Y) 5
(BL) 6
1
2
3
4
5
6
Figure 11. Standard Modular Cable Wiring
Figure 12 details the wiring connections from the PDA7422 to an
RS-422/485 serial converter (such as the PDA7485 or PDA8485) for a
four-wire network.
Figure 12. Connections for PDA7422 to Serial Converter
If the serial converter is configured for a two-wire network then the requirement to externally wire the DO to the DI and the /DO to the /DI on
the PDA7422 screw terminal connector is needed.
PDA7422 to RS-422/485 Serial
Converter Connections
RS-422/485
Serial Converter
PDA7422
RS-422/485 Adapter
DO DI
DO DI
DI DO
DI DO
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29
PDA7485 RS-232 TO RS-422/485 CONVERTER
P R E C IS IO N D IG IT A L
Description
The PDA7485 converts unbalanced, full-duplex RS-232 signals to balanced, full or half-duplex RS-422 or RS-485 signals.
The RS-232 port, configured as a DTE port, has a female DB9 connector with pins 2 (RX output), 3 (TX input), and 5 (Signal Ground). Pins 7
(RTS) and 8 (CTS) are tied together, and pins 1 (CD), 4 (DTR), and 6
(DSR) are tied together. The RS-485 terminal blocks support Transmit
Data (DO) and (/DO), Receive Data (DI) and (/DI), and Signal Ground.
A separate terminal block supports the power input (+12VDC) and power ground (GND).
Baud rates are automatic and handled by the PDA7485.
The PDA7485 has three diagnostic LEDs: a Power (P) LED to show
when the converter is powered properly, a Transmit Data (TX) LED to
show when the converter is sending data out from the PC side, and a
Receive Data (RX) LED to show when the converter is receiving data
from the network side.
The DIP switch SW1 is located between the screw terminal connectors
and allows for system configurations.
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30
Installation
The DIP switch SW1 allows for several different options. Factory settings for the switch are shown in Figure 13.
12345
Figure 13. PDA7485 Terminal Connectors and DIP Switch
The TERM switch position adds an internal 120 ohm termination resistor
when ON (up). Termination should be used on both ends of the network
with high data rates and long wiring runs.
To configure a two-wire network set both of the 2 WIRE switch positions
to ON (up). For a four-wire network set both of the 2 WIRE switches to
OFF (down).
When the RS422 switch position is ON (up) it is configured for an
RS-422 network. For RS-485 networks set the RS422 switch to OFF
(down).
The ECHO switch position allows the data being sent from the RS-232
port to be echoed back into the RS-232 port. In most networks, this is
an undesired effect and the ECHO switch would be OFF (down).
Figure 14. PDA7485 DIP Switch Settings
PDA7485 DIP Switch Settings
SW1 Switch Position ON Setting Function
1
Network Termination Included
(120 ohm)
2
2-Wire Network Mode Connection
(factory setting)
3
2-Wire Network Mode Connection
(factory setting)
4 RS-422 Mode
5 ECHO Mode
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31
Figure 15 shows an example configuration of a two-wire network. Each
device (e.g. Trident PD765 meter) connected to the same network must
have a unique address.
PDA7485
RS-232 to RS-485
Converter
RS-232 Serial
Connections
to PC
Last Adapter
R
Shield
Twisted-Pair
R
DI
DI DO DO
DI
DI DO DO
Modular Cable to
Meter (Provided)
Adapter #1
PDA7422
RS-422/485
Adapter
DI
DI
DO
DO
P R EC IS IO N D IG IT A L
P RE C IS IO N D IG ITA L
Figure 15. RS-485 Two-Wire Multi-Drop 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 PDA7422 documentation for further details.
3. Use shielded cable, twisted-pair plus ground. Connect ground shield
only at one location.
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32
Connections
To power the PDA7485, connect 12 VDC to the +12VDC and ground to
the GND screw terminals from the supplied 115 VAC/12 VDC adapter.
The PDA7485 may be configured for either a four-wire or two-wire network. Figure 16 details the wiring connections from the PDA7485 to an
RS-422/485 serial device in a four-wire network.
Figure 16. Connections for PDA7485 in a Four-Wire Network
Figure 17 details the wiring connections from the PDA7485 to an
RS-422/485 serial device in a two-wire network when the DIP switches on
the PDA7485 have been set to the “2-Wire Mode”.
Figure 17. Connections for PDA7485 in a Two-Wire Network
The PDA7485 internally connects the /DI to the /DO and the DI to the DO
when the DIP switches are set to “2-Wire Mode”. Either the /DI or /DO
could be used to connect to /DATA and either the DI or DO could be used
to connect to DATA.
Two PDA7485 RS-232 to RS-422/485 Serial Converters could be used
as a serial extender to allow RS-232 serial devices to communicate over
long distances. This would allow an RS-232 device to operate up to
3,937’ (1,200 m).
PDA7485 to RS-422/485 Serial Device Four-Wire Connections
PDA7485 Serial Converter RS-422/485 Serial Device
DO
DI
DO
DI
DI
DO
DI
DO
PDA7485 to RS-422/485 Serial Device Two-Wire Connections
PDA7485 Serial Converter RS-422/485 Serial Device
DO
DATA
DO DATA
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Serial Communication Converters & Adapters Instruction Manual
33
PDA7488 TRIDENT RS-232 & RS-485
MULTI-INPUT ADAPTER
Description
The PDA7488 converts the serial output of the PD765 Trident meter to
either an unbalanced, full-duplex RS-232 signal or balanced, full or halfduplex RS-422 or RS-485 signals (but not for use at the same time).
The RS-232 port has a female DB9 connector with pins 2 (RX output),
3 (TX input), and 5 (Signal Ground). Pins 7 (RTS) and 8 (CTS) are tied
together, and pins 1 (CD), 4 (DTR), and 6 (DSR) are tied together.
The PDA7488 has a removable screw terminal connector for the
RS-422/485 terminals which includes Transmit Data (DO) and (/DO),
Receive Data (DI) and (/DI), and Signal Ground.
Baud rates are adjustable (9600 bps and up recommended) and handled by the PD765 (see the Trident Instruction Manual for more details).
The PDA7488 has three diagnostic LEDs: a Power (POWER) LED to
show when the adapter is powered properly, a Transmit Data (DATA
OUT) LED to show when the adapter is sending data to a PC, and a
Receive Data (DATA IN) LED to show when the adapter is receiving
data from a PC.
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34
Installation
Figure 19 shows the connection of a Trident meter to a PC using the
PDA7488 multi-input adapter board and a PDA7485 RS-232 to
RS-422/485 converter in an RS-485 network.
Mounting
The PDA7488 is installed using the four adhesive-backed mounting feet
included. Install the mounting feet into the holes on the corner of the
board such that the flat adhesive backed side is on the opposite side of
the connectors as shown in Figure 18. Clean the mounting surface prior
to installation. Remove the adhesive backing liner and press the corners
firmly when positioned for final installation (making sure to allow for
adequate room for all connections and/or wiring).
PDA7488
Mounting
Feet
Figure 18. PDA7488 Mounting
PD765 Serial Communication Address (serl)
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
PD765 Trident meter the address may be programmed from 00 to 99 for
PDC Protocol and from 1 to 247 for Modbus RTU. The PD765 Trident
meter is factory set to PDC Protocol at address 00.
To change the PD765 Trident meter address:
1. Press and hold Right arrow and Menu buttons for three seconds to
access Advanced Features menu of the meter.
2. Press Up arrow until Serial (SErL) menu is displayed and press
Enter/Ack, Addr is displayed.
3. Press Enter/Ack to change meter address using Right and Up
arrow buttons. Press Enter/Ack to accept.
4. Press Menu button to exit and return to Run Mode.
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Serial Communication Converters & Adapters Instruction Manual
35
Shield
PDA7485
RS-232/485
Converter
RS-232 Serial
Connections
to PC
R
R
R = 120 Ohm termination resistor, typical
Twisted-Pair
Modular Cable to
Meter (Provided)
PDA7488
Trident Multi-
Input Adapter
Board
DI
DI DO DO
METER 1
DI
DI
DO
DO
Figure 19. 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.
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36
Connections
The PDA7488 Multi-Input Adapter Board is powered by a Trident PD765
meter connected to METER 1 connector as shown on Figure 19. The
attached meter must be powered and the connection using the standard
modular cable provided must be maintained to power the adapter. Figure 20 shows the cable details.
(WH) 1
(BK) 2
(R) 3
(G) 4
(Y) 5
(BL) 6
1
2
3
4
5
6
Figure 20. Standard Modular Cable Wiring
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Serial Communication Converters & Adapters Instruction Manual
37
PDA8232 USB TO RS-232 CONVERTER
Description
The PDA8232 USB to RS-232 Converter allows for direct connection of
a serial device to the USB port of a PC.
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Serial Communication Converters & Adapters Instruction Manual
38
Installation
Figure 21. shows the connection of a Trident meter to a PC using a
PDA8232 USB to RS-232 Converter, PDA7232 RS-232 adapter, and
the PDA7420 Modular Cable.
PDA7420
Modular Cable
PDA7232
RS-232 Adapter
PDA8232
Converter
PRECISION DIGITAL
Figure 21. Connections for PDA8232 to serial device
When connecting a Precision Digital ConsoliDator® to a PC using the
PDA8232 USB to RS-232 Converter, a Null Modem Cable (not included) must be used. A Null Modem Cable is a serial cable that swaps
pairs of the wires to allow the two connected devices to operate as they
would if they were linked using modems.
Two PDA7485 RS-232 to RS-422/485 Serial Converters could be used
as a serial extender to allow RS-232 serial devices to communicate over
long distances. This would allow an RS-232 serial device, such as the
Precision Digital ConsoliDator
®
, to operate up to 3,937’ (1,200 m).
Page 39
Serial Communication Converters & Adapters Instruction Manual
39
PDA8485 USB TO RS-422/485 CONVERTER
P R E C IS IO N D IG IT A L
DI
DI
DO
DO
Description
The PDA8485 converts USB to balanced, full or half-duplex RS-422 or
RS-485 signals.
The PDA8485 has a removable screw terminal connector for the
RS-422/485 terminals which includes Transmit Data (DO) and (/DO),
Receive Data (DI) and (/DI), and Signal Ground.
Baud rates are automatic and handled by the PDA8485.
The PDA8485 has three diagnostic LEDs: a Power (P) LED to show
when the converter is powered properly, a Transmit Data (TX) LED to
show when the converter is sending data out from the PC side, and a
Receive Data (RX) LED to show when the converter is receiving data
from the network side.
The DIP switch SW1 is located inside the case and allows for system
configurations.
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Serial Communication Converters & Adapters Instruction Manual
40
Installation
The DIP switch SW1 allows for several different options. Factory settings for the switch are shown in Figure 22.
12345
Figure 22. PDA8485 DIP Switch Location
The termination switch position adds an internal 120 ohm termination
resistor when ON (up). Termination should be used on both ends of the
network with high data rates and long wiring runs.
To configure a two-wire network set both of the 2-wire switch positions
to ON (up). For a four-wire network set both of the 2-wire switches to
OFF (down).
When the RS-422 switch position is ON (up) and the RS-485 switch
position is OFF (down) it is configured for an RS-422 network.
When the
RS-422 switch position is OFF (down) and the RS-485 switch position is
ON (up) it is configured for an RS-485 network.
PDA8485 DIP Switch Settings
SW1 Switch Position ON Setting Function
1
Network Termination Included
(120 ohm)
2
2-Wire Network Mode Connection
(factory setting)
3
2-Wire Network Mode Connection
(factory setting)
4 RS-422 Mode
5 RS-485 Mode (factory setting)
Figure 23. PDA8485 DIP Switch Settings
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Serial Communication Converters & Adapters Instruction Manual
41
Connections
The PDA8485 is powered by the USB port.
The PDA8485 can be configured for either a four-wire or two-wire network. Figure 24 details the wiring connections from the PDA8485 to an
RS-422/485 serial device in a four-wire network.
Figure 24. Connections for PDA8485 in a Four-Wire Network
Figure 25 details the wiring connections from the PDA8485 to an
RS-422/485 serial device in a two-wire network when the DIP switches on
the PDA8485 have been set to the “2-Wire Mode”.
Figure 25. Connections for PDA8485 in a Two-Wire Network
The PDA8485 internally connects the /DI to the /DO and the DI to the DO
when the DIP switches are set to “2-Wire Mode”. Either the /DI or /DO
could be used to connect to /DATA and either the DI or DO could be used
to connect to DATA.
PDA8485 to RS-422/485 Serial
Device Four-Wire Connections
PDA8485 Serial
Converter
RS-422/485 Serial
Device
DO DI
DO DI
DI DO
DI DO
PDA8485 to RS-422/485 Serial
Device Two-Wire Connections
PDA8485 Serial
Converter
RS-422/485 Serial
Device
DO
DATA
DO
DATA
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Serial Communication Converters & Adapters Instruction Manual
42
Figure 26 shows an example configuration of a two-wire network. Each
device (e.g. Trident PD765 meter) connected to the same network must
have a unique address.
PDA8485
USB to RS-422/485
Converter
USB
Connection
to PC
Last Adapter
R
R = 120 Ohm termination resistor, typical
Shield
Twisted-Pair
R
DI
DI DO DO
DI
DI DO DO
Modular Cable to
Meter (Provided)
Adapter #1
PDA7422
RS-422/485
Adapter
DI
DI
DO
DO
P R EC IS IO N D IG IT A L
P RE C IS IO N D IG IT A L
Figure 26. RS-485 Two-Wire Multi-Drop 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 PDA7422 documentation for further details.
3.
Use shielded cable, twisted-pair plus ground. Connect ground shield
only at one location.
Page 43
Serial Communication Converters & Adapters Instruction Manual
43
TROUBLESHOOTING
Symptom Check/Action
Power LED is off PDA1232, PDA1485, PDA7232, or
PDA7422:
1. Check modular cable connection
2. Check power to meter
PDA7485:
1. Check wall plug adapter output
2. Check power connection polarity
PDA7488:
1. Check Meter 1 connected/powered
2. Check modular cable connections
PDA8485:
1. Check USB connections
2. Try different USB port
3. Check USB port with other device
Meter not communicating with
MeterView
®
or other programs
Check:
1. Serial adapter and cable
2. Serial protocol selected
3. Meter address and baud rate
4. MeterView address and baud rate
5. Check DIP switch setting on the
PDA7485 or PDA8485
If only the TX (or DATA IN) data
status LED is flashing when serial
communications attempted
Check:
1. Serial adapter and cable
2. Serial protocol selected
3. Meter address and baud rate
4. MeterView address and baud rate
5. Check DIP switch setting on the
PDA7485 or PDA8485
If both data status LEDs (TX and
RX) are off when trying to communicate
Remove all unnecessary cables and
meters. Try getting the system to work
with only one meter (to ease troubleshooting) and then expand the system
one device at a time.
PDA1232, PDA7232, or PDA7485:
1. Check serial cable
2. Connect the DB9 directly to the PC
3. Try a different serial port
Communications slow Increase the baud rate
Random communication errors 1. Increase the TX delay time
2. Decrease the baud rate
Other symptoms not described
above
Call Technical Support for
assistance.
Page 44
Serial Communication Converters & Adapters Instruction Manual
LIM7232_H.doc
06/08
How to Contact Precision Digital
• For Technical Support please
Call: (800) 610-5239 or (508) 655-7300
Fax: (508) 655-8990
Email: [email protected]
• For Sales Support or to place an order please
Call: (800) 343-1001 or (508) 655-7300
Fax: (508) 655-8990
Email: [email protected]
• For the latest version of this manual please visit
www.predig.com
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