RS485
In the case of RS485, the same pinning as for RS422 is used, except that pins T- and
R- must be connected externally and pins T+ and R+ must be connected externally to
produce the signals T-/R- and T+/R+. For two-wire RS485 multidrop, the following
connection setup shall be used:
Figure 7. Two-wire RS485 connection setup.
Button and LED
If the
restore button
(see
Figure 3
) is pressed during power on, the default serial
settings as well as the default escape sequence are restored.
The status LED uses the following color indications.
Green
: The current mode is data mode and no connection attempt is in
progress.
Orange
: The current mode is AT mode.
Purple
: A connection attempt is in progress.
Blue
: A connection is currently active.
Blue Blinking
: A connection is active and data is transmitted or received over
air.
Red Blinking
: Buffer overflow, parity or framing error detected on the UART.
