Serial Communication Converters & Adapters Instruction Manual
33
PDA7488 TRIDENT RS-232 & RS-485
MULTI-INPUT ADAPTER
Description
The PDA7488 converts the serial output of the PD765 Trident meter to
either an unbalanced, full-duplex RS-232 signal or balanced, full or half-
duplex RS-422 or RS-485 signals (but not for use at the same time).
The RS-232 port has a female DB9 connector with pins 2 (RX output),
3 (TX input), and 5 (Signal Ground). Pins 7 (RTS) and 8 (CTS) are tied
together, and pins 1 (CD), 4 (DTR), and 6 (DSR) are tied together.
The PDA7488 has a removable screw terminal connector for the
RS-422/485 terminals which includes Transmit Data (DO) and (/DO),
Receive Data (DI) and (/DI), and Signal Ground.
Baud rates are adjustable (9600 bps and up recommended) and han-
dled by the PD765 (see the Trident Instruction Manual for more details).
The PDA7488 has three diagnostic LEDs: a Power (POWER) LED to
show when the adapter is powered properly, a Transmit Data (DATA
OUT) LED to show when the adapter is sending data to a PC, and a
Receive Data (DATA IN) LED to show when the adapter is receiving
data from a PC.
