1 power supply setup, 2 cables for serial communication, 1 usb connection (recommended) – Maxim Integrated 71M6541 Demo Board User Manual

Page 8: 2 serial connection (via optional debug board), Power supply setup, Cables for serial communication, Table 1-1: jumper settings on debug board, Table 1-2: straight cable connections, Table 1-3: null-modem cable connections

71M6541 Demo Board REV 3.0 User’s Manual

Rev 4.0

1.7.1 POWER SUPPLY SETUP

There are several choices for the meter power supply:

Internal (using the AC line voltage). The internal power supply is only suitable when the voltage ex-
ceeds 100V RMS. To enable the internal supply, a jumper needs to be installed across JP6 on the top
of the board.

External 5.0VDC connector (J20) on the Demo Board.

1.7.2 CABLES FOR SERIAL COMMUNICATION

1.7.2.1 USB Connection (Recommended)

A standard USB cable can be used to connect the Demo Board to a PC running HyperTerminal or a similar se-
rial interface program. A suitable driver, e.g., the FTDI CDM Driver Package, must be installed on the PC to en-
able the USB port to be mapped as a virtual COM port. The driver can be found on the FTDI web site
(www.ftdichip.com).

See Table 3-1 for correct placement of jumper JP5 depending on whether the USB connection or the serial
connection via the Debug Board is used.

1.7.2.2 Serial Connection (via Optional Debug Board)

For connection of the DB9 serial port of the Debug Board to a PC serial port (COM port), either a straight or a
so-called “null-modem” cable may be used. JP1 and JP2 are plugged in for the straight cable, and JP3/JP4 are
empty. The jumper configuration is reversed for the null-modem cable, as shown in Table 1-1.

Cable Configura-

tion

Mode

Jumpers on Debug Board

JP1

JP2

JP3

JP4

Straight Cable

Default

Installed

Null-Modem Cable

Alternative

Installed

Table 1-1: Jumper Settings on Debug Board

JP1 through JP4 can also be used to alter the connection when the PC is not configured as a DCE device. Ta-
ble 1-2 shows the connections necessary for the straight DB9 cable and the pin definitions.

PC Pin

Function

Demo Board Pin

Signal Ground

Table 1-2: Straight Cable Connections

Table 1-3 shows the connections necessary for the null-modem DB9 cable and the pin definitions.

PC Pin

Function

Demo Board Pin

Signal Ground

Table 1-3: Null-modem Cable Connections

See Table 3-1 for correct placement of jumper JP5 on the Demo Board depending on whether the USB connec-
tion or the serial connection via the Debug Board is used.