Laurel Electronics LAUREATE SERIES Serial Comunications - Manual (Page 3)

1.0 HARDWARE AND SOFTWARE SETUP
The word “modular” refers to telephone-type extension cable and connections.
To connect a single meter to the computer you will need:
1.
A modular extension cable.
2. An adapter that contains a modular receptacle for the cable and has either a 9 pin or 25 pin
subminiature D connector that is plugged into the RS485 converter in the computer.
To connect 2 or more meters to a computer you will need as a minimum:
1.
The same two items as above.
2. One STRAIGHT-THRU modular extension cable for each meter.
The RS-232 and RS-485 boards contain modular (telephone) interface connectors to allow low-
cost telephone-type cable to be used for wiring between the DPM and a host computer or other
DPM’s. A modular adapter with programmable wiring to a subminiature D connector, either 9-pin
or 25-pin, as required, may be used to facilitate connection to the computer.
CAUTION: There are two common types of modular extension cables, those wired STRAIGHT-
THRU for data applications and those wired in REVERSE or CROSS-PINNED for
telephone extensions.
1.1 SELECTING THE MODULAR CABLE TYPE.
Application
Computer to single meter
Computer to multiple meters
(multi-drop)
Meter (Master) to meter
(Slave)
Meter (Master) to multiple
meters (Slaves)
-2-
Cable Type
Use a STRAIGHT-THRU modular cable and then wire the
modular-to- subminiature D connector adapter that plugs
into the computer.
Use a STRAIGHT-THRU modular cable and then wire the
modular-to- subminiature D connector adapter that plugs
into the computer and STRAIGHT-THRU modular cables
for all remaining connections.
Use only a REVERSE modular cable to connect transmit of
Master to receive of Slave.
Use a REVERSE modular cable from the Master to the first
meter and STRAIGHT-THRU modular cables for all re-
maining connections.