Page 1
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 Serial Communication RS-232 Adapter
Trident Serial Communication RS-485 Adapter
Trident Serial Communication USB Adapter
PROVU Serial Communication RS-232 Adapter
PROVU Serial Communication RS-485 Adapter
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel (800) 343-1001 • Fax (508) 655-8990
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
Model
Description
PDA1232
PROVU RS-232 Serial Adapter
PDA1485
PROVU RS-485 Serial Adapter
PDA7420
Trident Meter Copy Cable, 7' (2.1 m)
PDA7232
Trident RS-232 Serial Adapter, PDA7420 included
PDA7422
Trident RS-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
PDA8006
Trident USB Serial 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
MeterView® Pro
MeterView® Pro Software for PROVU Meters
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.
!
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
PROVU®, 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.
© 2008-2016 Precision Digital Corporation. All rights reserved.
Ordering Information
Safety Information
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
Table of Contents
Ordering Information ------------------------------------ 2
Safety Information ---------------------------------------- 2
Table of Contents ----------------------------------------- 3
Table of Figures ------------------------------------------- 3
Specifications ---------------------------------------------- 4
PDA1232 PROVU RS-232 Serial Adapter ---------------- 4
PDA1485 PROVU RS-485 Serial Adapter ---------------- 4
PDA7232 Trident RS-232 Serial Adapter --------------- 4
PDA7422 Trident RS-485 Serial Adapter --------------- 4
PDA7485 RS-232 to RS-422/485 Converter ----------- 5
PDA8006 Trident USB Serial Adapter ------------------- 5
PDA8232 USB to RS-232 Converter --------------------- 5
PDA8485 USB to RS-422/485 Converter --------------- 5
Serial Communications Overview ------------------- 6
PDA1232 PROVU RS-232 Serial Adapter ----------- 7
Description ------------------------------------------------------ 7
Installation ------------------------------------------------------- 7
Connections --------------------------------------------------- 8
PROVU Serial Communication Address (serial) --- 8
PDA1485 PROVU RS-485 Serial Adapter ----------- 9
Description ------------------------------------------------------ 9
Installation ------------------------------------------------------- 9
PROVU Serial Communication Address (serIAl) --- 9
Connections ------------------------------------------------- 11
PDA7232 Trident RS-232 Serial Adapter --------- 12
Description ---------------------------------------------------- 12
Installation ----------------------------------------------------- 12
Connections ------------------------------------------------ 13
PDA7422 Trident RS-485 Serial Adapter --------- 14
Description ---------------------------------------------------- 14
Installation ----------------------------------------------------- 14
PD765 Serial Communication Address (serl)----- 14
Connections ------------------------------------------------ 16
PDA7485 RS-232 to RS-422/485 Converter ----- 18
Description ---------------------------------------------------- 18
Installation ----------------------------------------------------- 18
Connections ------------------------------------------------ 20
PDA8006 Trident to USB Serial Adapter --------- 21
Description ---------------------------------------------------- 21
Installation ----------------------------------------------------- 21
PDA8232 USB to RS-232 Converter --------------- 22
Description ---------------------------------------------------- 22
Installation ----------------------------------------------------- 22
PDA8485 USB To RS-422/485 Converter -------- 23
Description ---------------------------------------------------- 23
Installation ----------------------------------------------------- 23
Connections ------------------------------------------------ 24
Troubleshooting ----------------------------------------- 26
Table of Figures
Figure 1. General Four-Wire Network Connection ..... 6
Figure 2. General Two-Wire Network Connection ...... 6
Figure 3. RS-232 Adapter Connections ....................... 7
Figure 4. RS-422 or RS-485 Wiring ............................ 10
Figure 5. RS-485 Two-Wire Multi-Drop Wiring .......... 11
Figure 6. Connections for PDA1485 to Serial
Converter ............................................................. 11
Figure 7. RS-232 Adapter Connections ..................... 12
Figure 8. Standard Modular Cable Wiring ................. 13
Figure 9. RS-422 or RS-485 Wiring ............................ 15
Figure 10. RS-485 Two-Wire Multi-Drop Wiring ........ 16
Figure 11. Standard Modular Cable Wiring ............... 16
Figure 12. Connections for PDA7422 to Serial
Converter .............................................................. 17
Figure 13. PDA7485 Terminal Connectors and DIP
Switch ................................................................... 18
Figure 14. PDA7485 DIP Switch Settings ................... 19
Figure 15. RS-485 Two-Wire Multi-Drop Wiring ......... 19
Figure 16. Connections for PDA7485 in a Four-Wire
Network ................................................................. 20
Figure 17. Connections for PDA7485 in a Two-Wire
Network ................................................................. 20
Figure 18. USB Adapter Connections ........................ 21
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
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 computer: 50' (15 m)
max; serial interface cable not provided
Power
Powered by PROVU meter M-Link connection
Status Indication
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
Compatibility
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 PROVU meter: 6' (1.8 m) max; Adapter to computer: 3,937' (1,200
m) max
Power
Powered by PROVU meter M-Link connection
Status Indication
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
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 computer: 50' (15 m)
max; serial interface cable not provided
Power
Powered by Trident PD765 RJ11 connection
Status Indication
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
Compatibility
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 computer: 3,937' (1,200
m) max
Power
Powered by Trident PD765 RJ11 connection
Status Indication
Separate LEDs for Power (P), Transmit (TX), and
Receive (RX)
Specifications
PDA1232 PROVU RS-232 Serial Adapter
PDA1485 PROVU RS-485 Serial Adapter
PDA7232 Trident RS-232 Serial Adapter
PDA7422 Trident RS-485 Serial Adapter
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
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 connection: 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 Indication
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
Compatibility
USB 1.1, USB 2.0
Connectors
RJ11, and USB Type B
Cable
One 7' (2.1 m) standard modular cable and one 3.28’ (1.0 m) USB A-B Male
cable provided with adapter
Distance
Adapter to PD765 meter: 7' (2.1 m) max; USB connection to PC: 10' (3 m)
max
Driver
Windows 98/SE, ME, 2000, Server 2003/2008, XP 32/64-Bit, Vista 32/64Bit, Windows 7 32/64-Bit
Power
USB Port
Status Indication
Separate LEDs for Power (P), Transmit (TX), and Receive (RX)
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
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 Indication
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
PDA7485 RS-232 to RS-422/485 Converter
PDA8006 Trident USB Serial Adapter
PDA8232 USB to RS-232 Converter
PDA8485 USB to RS-422/485 Converter
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
PDA8485
DO
DO
DI
DI
GND
DO
DO
DI
DI
GND
RS-422/485 DEVICE
PDA8485
DATA
DATADO
DO
DI
DI
GND GND
RS-485 DEVICE
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
multi-point 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 highimpedance 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 Alpha 6203C. A two-wire system requires two twisted pairs, and a
four-wire 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 four-wire network actually contains 5
wires).
Figure 1. General Four-Wire Network Connection
Figure 2 illustrates how to connect a general two-wire network (a two-wire 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).
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Figure 2. General Two-Wire Network Connection
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
PDA1232 PROVU RS-232 Serial Adapter
Description
The PDA1232 converts the serial output of the PROVU 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 PROVU 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.
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.
Figure 3. RS-232 Adapter Connections
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
Connections
A Cat5e cable is provided to connect the PROVU meter to the PDA1232 serial adapter.
PROVU Serial Communication Address (serial)
For the PROVU Trident meter the address may be programmed from 001 to 247. The PROVU meter is
factory set to address 001.
To change the PROVU 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.
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
PDA1485 PROVU RS-485 Serial Adapter
Description
The PDA1485 converts the serial output of the PROVU 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 PROVU 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.
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.
PROVU 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 PROVU meter the address may be programmed from 001 to 247. The
PROVU meter is factory set to address 001.
To change the PROVU 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.
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
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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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
PDA1485 to RS-422/485 Serial Converter
Connections
RS-422/485 Serial
Converter
PDA1485
RS-485 Adapter
DO DI
DO DI
DI DO
DI 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.
Connections
A Cat5e cable is provided to connect the PROVU 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.
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
PDA7232 Trident RS-232 Serial Adapter
Description
The PDA7232 converts the serial output of the PD765 Trident meter to an unbalanced, full-duplex RS232 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.
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.
Figure 7. RS-232 Adapter Connections
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
(WH) 1
(BK) 2
(R) 3
(G) 4
(Y) 5
(BL) 6
1
2
3
4
5
6
Connections
A PDA7420 cable is provided to connect the Trident meter to the PDA7232 serial adapter. Figure 8
shows the PDA7420 cable details.
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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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
PDA7422 Trident RS-485 Serial Adapter
Description
The PDA7422 converts the serial output of the PD765 Trident meter to balanced, full or half-duplex RS485 signals.
The PD7422 has a removable screw terminal connector for the 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.
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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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
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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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
(WH) 1
(BK) 2
(R) 3
(G) 4
(Y) 5
(BL) 6
1
2
3
4
5
6
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.
Connections
A PDA7420 cable is provided to connect the Trident meter to the PDA7422 adapter. Figure 11 shows the
PDA7420 cable details.
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.
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
PDA7422 to RS-422/485 Serial Converter
Connections
RS-422/485 Serial
Converter
PDA7422
RS-485 Adapter
DO DI DO DI DI DO DI DO
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.
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
12 345
PDA7485 RS-232 to RS-422/485 Converter
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.
Installation
The DIP switch SW1 allows for several different options. Factory settings for the switch are shown in Figure 13.
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).
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
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
Figure 14. PDA7485 DIP Switch Settings
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.
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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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
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
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 RS232 serial devices to communicate over long distances. This would allow an RS-232 device to operate
up to 3,937’ (1,200 m).
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
PDA8006 Trident to USB Serial Adapter
Description
The PDA8006 Trident to USB Serial Adapter allows for direct connection of a Trident meter to the USB
port of a PC.
Installation
Figure 21 shows the connection of a Trident Series meter to a PC using a PDA8006 Trident to USB Serial
Adapter.
Figure 18. USB Adapter Connections
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
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.
Installation
Figure 23. 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.
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.
When connecting the ConsoliDator® to a PC via the PDA8232, it is strongly recommended to change the
ConsoliDator's parity parameter to "NONE - 8N2," for None parity, 2 stop bits.
Two PDA7485 RS-232 to RS-422/485 Serial Converters could be used as a serial extender to allow RS232 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).
Figure 23. Connections for PDA8232 to serial device
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
1 2 3 4 5
PDA8485 USB To RS-422/485 Converter
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.
Installation
The DIP switch SW1 allows for several different options. Factory settings for the switch are shown in
Figure 24.
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.
Figure 24. PDA8485 DIP Switch Location
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
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)
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
Figure 25. PDA8485 DIP Switch Settings
Connections
The PDA8485 is powered by the USB port.
The PDA8485 can be configured for either a four-wire or two-wire network. Figure 26 details the wiring
connections from the PDA8485 to an RS-422/485 serial device in a four-wire network.
Figure 26. Connections for PDA8485 in a Four-Wire Network
Figure 27 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 27. 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.
Figure 28 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.
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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
Figure 28. 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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ProtEX-MAX PD8-6210 Explosion-Proof Analog Input Batch Controller Instruction Manual
Symptom
Check/Action
Power LED is off
PDA1232, PDA1485, PDA7232, or PDA7422:
1. Check modular cable connection
2. Check power to meter PDA7485:
3. Check wall plug adapter output
4. Check power connection polarity PDA8485, PDA8006,
PDA8008:
5. Check USB connections
6. Try different USB port
7. 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. 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. 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.
Troubleshooting
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