sames

sames

PM9904BPD

2/22

http://www.sames.co.za

JUMPER SETTINGS

Power supply jumpers

The power supply jumpers are used to disconnect the on-

board power supply, allowing the metering section of the circuit

to be powered from an external power supply if required.

Figure 2: Jumper positions

Voltage selection jumpers

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.

Jumper

230V

OPEN

OPEN

OPEN

J1

J2

J3

115V

Closed

Closed

Closed

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

Jumper

Description

J12

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

Parallel power supply jumper

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

from an external 5 volt supply via SK3.

Jumper

Description

JP4

Left connection - Power for U7 is taken from the

Right connection - Connects U7 to SK3. An

external power supply can be connected to

SK3 to power U7.

Jumper

Description

J4

J5

J6

Connects VDD to the metering circuitry.

Default closed

Connects VSS to the metering circuitry.

Default closed

GND connection point.

J7

Connection point between the power supply GND

(N) and the SA9904 GND. Default closed

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.

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.

sames

PM9904AP

JP4

J12

J8

J9

J10

J11

JP1

J3

J2

J1

J7

J6

GND

J5

J4

Push button

SK2

PB

F50*

VSS

VDD

Micro board

*On some pcb’s this may be labled as PB / F150, however f50 and f150 is the same connection.