Flowserve 2000 Series Digital Positioner - Manual (Page 6)

42-6
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Termination
Jumpers
System Communication Default
Configuration
StarPac II / Logix 2000 units are shipped from the factory
ready for installation and operation. Rarely do the units
need to be re-configured prior to operation. Table II lists
the factory default communication settings. If these
settings are not correct for the equipment being used,
proceed to the following sections.
Table II: Factory Default Mode Settings
Description Setting
Address 1
Parity odd
Baud Rate 19,200
Modbus Communication Mode RTU
RS-485 Termination Resistors Installed
Selecting Correct Address Setting
If the StarPac II / Logix 2000 unit is the only one on the
communication network, the default address (1) is fine.
If multiple units will be operating on the same communi-
cation network, each unit must have a unique address.
Before changing the address, the StarTalk software can
be used to determine what devices are on the line.
(Remember to include devices that may be temporarily
off line.)
If the default address setting needs to be changed, use
the 'Comm' option in the configuration menu of the local
interface to change the settings.
Selecting Correct Baud Rate Setting
StarPac II / Logix 2000 units support baud rates of up to
57,600 baud. However, both the StarPac II / Logix 2000
system and StarTalk software are shipped from the
factory set to 19,200 baud.
If the default baud rate setting needs to be changed, use
the 'Comm' option in the configuration menu of the local
interface to change the settings.
Selecting Correct Modbus Transmission
Mode
Two transmission modes exist in a Modbus system,
ASCII and RTU (default). Use the ASCII mode when
transmitting information through a device that uses
ASCII control codes; for example, a modem. Use the
RTU mode when connecting directly to both devices; for
example, an RS-485 interface card wired directly to a
StarPac II / Logix 2000 system.
If the default Modbus transmission mode setting needs
to be changed, use the 'Comm' option in the configura-
tion menu of the local interface to change the settings.
Selecting Proper RS-485 Termination
Resistor Setting
A termination resistor must be installed on the two most
remote devices on the network, counting the host
computer as any other device.
(For example, a single StarPac II / Logix 2000 unit and
the RS-485 driver in the host computer would each
require the termination resistor to be installed. If four
units were on the network with a host computer, decide
which of the two devices have the most combined cable
length between them. These two devices should have
the termination resistors installed. The termination
resistors should be disabled in the devices not consid-
ered to be the most remote using the instructions in the
next section. Using more than two termination resistors
in a network can cause the RS-485 communications to
operate erratically or fail.)
To enable 120 ohms termination, insert both jumpers
for A and B channels. To disable termination, remove
both jumpers from each channel as shown in
Figure 5.
SYSTEM MAINTENANCE
Valtek recommends that the StarPac II / Logix 2000
system calibration be checked every six months. If,
after checking the unit, a component is determined to
be defective, the following section will help with the
component replacement.
The following items may be needed to install, start up
and calibrate the unit's electronics.
Figure 5: Termination Jumpers and
Personality Module