CONFIGURING COM PORT 3 (SNAP-LCSX-PLUS ONLY)
SNAP-LCSX AND LCSX-PLUS Installation Guide
18
Jumper functions and two-wire and four-wire jumper settings are shown below. Use jumper group 5 (JP5) for
COM3. Make certain that the JP7 jumper remains in its default position, as shown.
Pin Connections for COM3
Pin
RS-232
RS-485 2-wire
RS-485 4-wire
1
TX
TX/RX +
TX +
2
RX
TX/RX -
TX -
3
COM
COM
COM
4
RTS
IRQ +*
RX +
5
CTS
IRQ -*
RX -
TX = Transmit
RX = Receive
COM = Common
Ground
RTS = Request to
Send
CTS = Clear to Send
IRQ = Interrupt
*NOTE: For 2-wire, use pins 4 and 5 only
if you are using an interrupt (IRQ). The
IRQ function is supported in 2-wire mode
only. Use pins 4 and 5 for the IRQ wires
and leave jumper H out.
RS-485 Jumper Functions
Two-Wire and Four-Wire Jumper Settings
JP5
Pin 1
