M9B-HFS INTERFACE
INSPECTION AND CONFIGURATION
Release 1.0 (97/10)
2-7
2.6 Computer Settings
For serial communication, the computer and the power supply must share the same communication settings.
Make sure that the settings of the computer and of the power supply agree with those shown in
Table 2.6-1.
Table 2.6-1 Power Supply Settings
Parameter
Setting
Transmission
Asynchronous
Mode
Full duplex
Baud rates
75, 150, 300, 600, 1200, 2400, 4800, 9600
Parity
None
Start Bit
1
Stop Bit
1
Data Bits
8
Flow Control
XON/XOFF, None
2.7 Internal Jumper Selections
CAUTION
If you remove the unit's cover, use proper static control techniques to avoid
damage to static-sensitive components on the printed circuit board.
Remote operation options OVP control, TTL Shutdown, and Local Mode Disable are selected by changing
jumper positions on the M9B-HFS PCB. Refer to the operating manual for information on how to use over
voltage protection and TTL shutdown.
2.7.1
OVP Control Selection
Over voltage protection (OVP) on the M9B-HFS Interface is set at the factory for remote software operation.
When operating the power supply in remote mode, you control the OVP trip level using the OVSET software
command. If you return the power supply to local operation by using the REN software command or the front
panel LOCAL button, control of the OVP trip level switches to the front panel OVP potentiometer. The default
OVP trip level is set as 110% of the power supply's rated output voltage. See Table 2.5-1 for a complete list of
remote power ON default settings.
You can change the location of OVP control by changing the positions of the OVP Control jumper J66 and the
Local Mode Disable jumper J104, both on the M9B-HFS PCB. The default jumper settings allow control of OVP
to depend on the operating state of the power supply. By physically changing the jumper settings, you can
isolate the location of OVP control to just software control or just front panel control. Table 2.8-1 shows a table
of jumper settings and OVP programming selection. Refer to Figure 2.7-1 for the positions of the jumpers on the
M9B-HFS PCB.
Note:
Jumper J104 affects more than just the location of OVP control. See Section 2.7.3 Local Mode Disable
before applying changes to jumper J104.
Table 2.7-1 OVP Control Mode Selection
PCB Jumper J66 Position
PCB Jumper J104 Position
OVP Programming Selection
Closed (default)
Closed (default)
Software or Front Panel OVP control
(dependent on the power supply operating
state)
Closed
Open
Software OVP control only
Open
Closed
Front Panel OVP control only
Open
Open
Front Panel OVP control only
Содержание Internal M9B-HFS Series
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