Figure 4: Typical wiring of the RS-485 communication line terminals in UMD 701 or optional M-Bus (right).
cable only (USB-A/mini). UMD 701 is a USB 2.0 slave device. For correct operation it needs a driver installed
in your operating system (see the EnVis user guide for more info).
Ethernet interface (optional)
10Base-T Ethernet interface with RJ-45 connector described
ETH
is situated
on a top panel of the device. Ethernet interface can be used as substitution for the primary RS-485 for connection
of the device to LAN and for easy connection of remote control PC.
RS-485 serial line
serves usually as a remote communication for reading of actual data, archive downloading and
device configuration. Serial RS-485 line uses terminals
A
+,
B-
with shielding at terminal
G
of
COM1
block (fig.
4). The end point of the communication line must be properly terminated with ˜120n resistor.
Secondary RS-485 (optional)
communication line serves for connection of external I/O modules or remote
display unit. Secondary RS-485 line uses terminals
A+
,
B-
with shielding at terminal
G2
of
COM2
block (fig. 4).
The final points of the communication line have to be fitted with terminating resistor approx. 120n.
M-Bus interface (optional)
provides predefined measured values to the remote M-Bus control system. the
M-Bus implementation is described in a standalone
Communication Protocol Mbus
manual. Its physical interface
uses terminals
M1
and
M2
of
COM2
block on fig. 4 (right). Polarity of the connection is free to choose.
2.2.5
Outputs and inputs
Digital Inputs
DI1 and DI2, sensitive to voltage, are using three terminals in
DI
block —
DI
is common
terminal,
D1
is first and
D2
is second digital input. Voltage lower than 3 V applied between
DI
and digital
input
D1
or
D2
is evaluated as inactive state, voltage greater than 10 V is evaluated as active state. On fig. 5
right there is a sample schema for connection of two external switches in series with voltage source of 24 V
DC
.
Digital Output
connected through terminals
O+
and
O-
. There must be an external voltage source in series
(24 V
DC
is recommended). In case of solid state based DO outputs an external voltage supply polarity must
comply with terminal poles (see fig. 5).
