PM9904BPD
ssaammeess
JUMPER SETTINGS
Powersupplyjumpers
The power supply jumpers are used to disconnect the on-
board power supply, allowing the metering section of the circuit
tobepoweredfromanexternalpowersupplyif required.
with the PM9904BPD module the jumpers must be closed, and
can be left closed in the case of the SAMES micro-controller
board. This board is capable of driving the SPI bus in this state.
Default Closed.
Jumper
Description
Connects VDD to the metering circuitry.
Default closed
J4
An additional output from the module is made available to the
parallel port of the PC. The output can be selected to be the
SA9904B’s F50 output or it can be selected to be the modules
push button output.
Connects VSS to the metering circuitry.
Default closed
J5
J6
J7
GND connection point.
Connection point between the power supply GND
(N) and the SA9904 GND. Default closed
Jumper
Description
PB (left connection) - Connects the push button
output through a opto-coupler to pin 13 of the
parallel port
F50 (right connection) - Connects pin 7 of the
SA9904 through a opto-coupler to pin 13 of the
parallel port
Voltageselection jumpers
J12
The following jumpers are used to select between 115V and
230V operation. When closed the series resistance in the
voltage divider circuits to the voltage sense inputs are halved.
Default Open.
Parallel powersupplyjumper
Jumper
230V
OPEN
OPEN
OPEN
115V
Jumper JP4 is used to select the power source for the opto-
coupler U7. Power can be taken from the PC’s parallel port or
fromanexternal5volt supplyviaSK3.
J1
Closed
Closed
Closed
J2
J3
Jumper
Description
Left connection - Power for U7 is taken from the
PC’s parallel port (pins 1, 14,16,17)
Communication jumpers
Jumpers J8 to J11 connect pull up resistors to the SPI inputs
of the SA9904. The pull up resistors are required by the open
drain outputs of the HCPL2631 opto-couplers. If a PC is used
JP4
Right connection - Connects U7 to SK3. An
external power supply can be connected to
SK3 to power U7.
sames
PM9904AP
JP4
Micro board
J12
PB F50*
JP1
J8
J9
J3
J2
J1
J10
J11
J7
J6
SK2
Push button
GND
J5
VSS
J4
VDD
*On some pcb’s this may be labled as PB / F150, however f50 and f150 is the same connection.
Figure 2: Jumper positions
2/22
http://www.sames.co.za
SAMES [ SAMES ]
