CMDN Manual 19
LSS4 Field Wiring
The total length of the RS-485 communications loop used to connect
multiple annunciators when used with an LSS4 panel can not exceed
4,500' (1372 M) in total length, based on #18 AWG twisted-pair wire.
Note: The Terminals on the annunciators can not accept wire greater
than #18 AWG.
Wire the annunciators per the figures that follow. The table below lists
these connections:
Annunciator LSS4 Terminal Connections
Terminal Function Connect to
1 + 24 VDC
+ 24 VDC Power Supply
2 24 VDC Common
24 VDC Common Power Supply
3 Earth Ground
Local earth ground
4 RS-232, Rx In
RS-232 - To Tx OUT on printer
(To data Tx on PC serial port when
downloading)
5 RS-232, Tx Out
RS-232 -To Rx IN on printer
(To data Rx on PC serial port when
downloading)
6 RS-232, Common
RS-232 - Common on printer
(To common on PC serial port when
downloading)
7 RS-485, Ch 0 (+)
From LSS4, RS-485 (+), To/From
Term #7 of additional CMDN/SMDN's
8 RS-485, Ch 0 (-)
From LSS4, RS-485 (-), To/From
Term #8 of additional CMDN/SMDN's
9 RS-485, Ch 1 (+)
Not Used
10 RS-485, Ch 1 (-)
Not Used
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