Serial Communication Adapters
Instruction Manual
8
101B224-07 RS-485 Serial
Adapter
Description
The 101B224-07 converts the serial output of the DM61
meter to balanced, full or half-duplex RS-485 signals.
The 101B224-07 has a removable screw terminal
connector for the RS-485 terminals which includes
Transmit Data (DO) and (/DO), Receive Data (DI) and
(/DI), and Signal Ground. The adapter is provided by
the DM61 meter M-Link connection.
Baud rates are adjustable and handled by the DM61
(see the DM61 Instruction Manual for more details).
The 101B224-07 has three diagnostic LEDs: a Power
(P) LED to show when the adapter is powered properly,
a Transmit Data (TX) LED to show when the adapter is
sending data out from the PC side, and a Receive Data
(RX) LED to show when the adapter is receiving data
from the DM61 meter.
Installation
shows the connection of a DM61 meter to a
PC using the 101B224-07 serial adapter and an RS-232
to RS-485 converter in an RS-422 network. The
101B224-07 has an RJ45 connector to connect the
Cat5e cable and a screw terminal connector to connect
to the RS-422 network.
shows the connection of DM61 meters with
101B224-07 serial adapters to a PC using an
RS-232 to RS-485 converter in an RS-485 network.
Figure 12. RS-422 or RS-485 Wiring
Notes:
1. Termination resistors are optional and values
depend on the cable length and characteristic
impedance. Consult the cable manufacturer for
recommendations.
2. Use shielded cable, twisted-pairs plus ground.
Connect ground shield only at one location.
Figure 13. 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. Use shielded cable, twisted-pair plus ground.
Connect ground shield only at one location.
Connections
A Cat5e cable is provided to connect the DM61 meter
to the 101B224-07 adapter.
details the wiring connections from the
101B224-07 to an RS-485 serial converter for a four-
wire network.
101B224-07 to RS-485 Serial Converter
Connections
RS-485 Serial
Converter
101B224-07 RS-485
Adapter
Figure 14. Connections for 101B224-07 to Serial Converter
If the serial converter is configured for a two-wire
network, then the requirement to externally wire the DO
to the DI and the /DO to the /DI on the 101B224-07
screw terminal connector is needed.