Serial Communication Converters & Adapters
Instruction Manual
15
Connections
The ACC1003 is powered by the USB port.
The ACC1003 can be configured for either a four-wire
or two-wire network.
connections from the ACC1003 to an RS-485 serial
device in a four-wire network.
ACC1003 to RS-485 Serial Device Four-Wire
Connections
ACC1003 Serial
Converter
RS-485 Serial Device
Figure 27. Connections for ACC1003 in a Four-Wire
Network
details the wiring connections from the
ACC1003 to an RS-485 serial device in a two-wire
network when the DIP switches on the ACC1003 have
been set to the “2-Wire Mode”.
ACC1003 to RS-485 Serial Device Two-Wire
Connections
ACC1003 Serial
Converter
RS-485 Serial Device
Figure 28. Connections for ACC1003 in a Two-Wire
Network
The ACC1003 internally connects the /DI to the /DO
and the DI to the DO when the DIP switches are set to
“2-Wire Mode”. Either the /DI or /DO could be used to
connect to /DATA and either the DI or DO could be
used to connect to DATA.
shows an example configuration of a two-wire
network. Each device (e.g. APM765/VPM3000 meter)
connected to the same network must have a unique
address.
Figure 29. ACC1003 RS-485 Two-Wire Multi-Drop Wiring
Notes:
1.
Termination resistors are optional and values
depend on the cable length and characteristic
impedance. Consult the cable manufacturer for
recommendations.
2.
APMA7422 RS-485 Serial Adapter
3.
Use shielded cable, twisted-pair plus ground.
Connect ground shield only at one location.
Driver Download here:
USB Drivers are available for download from the
Documentation CD provided with every product.
