Flowserve Valtek StarPac 1 Intelligent Control Systems - Manual (Page 6)

41-6 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Table III: Address Dip Switch Settings
Switch no. on address block
1 = up = off
0 = down = on
1 Adds 1 to address value
1 Adds 2 to address value
1 Adds 4 to address value
1 Adds 8 to address value
1 Adds 16 to address value
1 Adds 32 to address value
1 Adds 64 to address value
1 Adds 128 to address value
2. Turn off the 24VDC power to the StarPac System.
3. Remove the large cover from the StarPac electron-
ics housing. (See Figure 2.)
4. Make the required dip switch changes (address,
parity, baud rate, and Modbus transmission mode)
according to Tables III and IV. These switches are
visible through the window cut in the lower side of
the shroud. (See Figure 5.)
a. The first dip switch block (marked address)
defines the Modbus address of the StarPac
system using binary coded decimal numbers
(switch 1 = 1; 2 = 2; 3 = 4; 4 = 8; 5 = 16; 6 = 32;
7 = 64; 8 = 128). The switches that are up (off
condition) define the address, refer to Table III.
For example, set address 11 by putting switches
1, 2, and 4 (1 + 2 + 8 = 11) up (off condition) and
3, 5, 6, 7, and 8 down (on condition).
b. The second dip switch block sets the parity,
baud rate and Modbus transmission mode.
NOTE: This block also contains initialization and
reset switches described later. Parity changes are
also done by using the switches marked PRTOCL
1 and 2 as shown in Table IV.
c. Set the baud rate by using the switches marked
BAUD 1, 2, and 3 as shown in Table IV.
d. Set the Modbus transmission mode with the
switch marked EXPAN. When the switch is up
(off), the transmission mode is RTU. When the
switch is down (on), transmission mode is ASCII.
NOTE: If the StarPac unit has a dual communication
port (model SPJD or NT), the single set of DIP
switches configures both ports. All of the communi-
cation parameters are the same including the address
of two ports. The identical address settings should
not conflict because separate ports are isolated
and independent for use on different networks.
1 2 3 4 5 6 7 8
Dipswitch
access slot
NOTE: Down means toward the circuit board; up means
away from the circuit board.
Figure 6: Dip Switch Access
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 com-
puter as any other device.
(For example, a single StarPac system and the RS-485
driver in the host computer would each require the
termination resistor to be installed. If four StarPac
systems were on the network with a host computer,
decide which of the two devices have the most com-
bined cable length between them. These two devices
should have the termination resistors installed. The
termination resistors should be disabled in the devices
not considered to be the most remote using the instruc-
tions in the next section. Using more than two termina-
tion resistors in a network can cause the RS-485 commu-
nications to operate erratically or fail.)
If the RS-485 termination resistor needs to be changed,
refer to Figure 5, Table IV and Changing Communication
Settings section, and make the necessary change.
Changing Communications Settings
If the StarPac system communication settings (ad-
dress, parity, baud rate, Modbus transmission mode,
and RS-485 termination resistor) need to be changed;
refer to Figures 4 and 5 and Table IV and proceed as
follows.
WARNING: Never remove the StarPac electronics
housing cover in explosive atmospheres; otherwise,
nearby personnel and equipment could be injured.
CAUTION: Properly ground yourself before handling
the sensitive StarPac electronics; otherwise unseen
damage to components may occur.
1. If the StarPac system is installed in line, make sure
that taking it and the valve off line will not adversely
affect the process.