22 Device Description
WAGO-I/O-SYSTEM 750 XTR
750-652/040-000 Serial Interface RS-232/RS-485 XTR
Manual
Version 1.3.0
3.3
Display Elements
Figure 5: Display Elements
Table 6: Legend for Figure “Display Elements”
Designation
LED
Status
Function
Function
A
Green
Ready for operation and undisturbed
local bus communication
Red
Not ready for operation or no or disturbed
local bus communication
TxD
(transmit)
B
OFF
No signal transmission TxD
Green
Signal transmission TxD present
1)
Yellow
I/O module has received XOFF
character, the transmission is inactive
2)
CTS line has fallen, the transmission is
inactive
3)
RxD
(receive)
C
OFF
No signal transmission RxD or input
open
Green
Signal transmission RxD present
1)
Red
Signal transmission RxD present
1)
, but
some characters received are defective
(parity, data frame or overrun error has
occurred)
4)
Transmission
status
D
OFF
No transmission error
Green
Output buffer is full
Yellow
Input buffer is full (LED lights up if there
are more than 2304 characters in the
input buffer. LED does not light up if
there are fewer than 2176 characters in
the input buffer)
Mode
E
Green
RS-485 half-duplex, DMX
Yellow
RS-422 full-duplex, data exchange
Red
RS-232
Data flow
control
F
OFF
No data flow control
Green
RTS/CTS data flow control active
3)
Yellow
XON/XOFF data flow control active
2)
Red
RTS with lead time and follow-on time is
active