Rice Lake Remote Displays/Scoreboards - Laser LT - Manual (Page 13)

Installation and Setup 9
2.3.4 Serial Wiring
Serial communications are connected to the CPU board using clamp spring connectors on J2, J3 and J4 (see
Table 2-3 for wiring positions ).
To connect the communications cable to the remote display, do the following:
1. If the enclosure is not open, make sure power is disconnected from the unit and open the latches on the
enclosure.
2. Loosen the serial cable cord grip and push enough communications cable into the enclosure to allow
attachment to the CPU board.
3. Strip 1/4" (.65 cm) of insulation from the serial cable ends.
4. Make cable connections for RS-232, or 20 mA current loop communications. Communications can be
made to any port. Com options are set up on ports 3 and 4. See Configuration of ports (host, keypad, daisy
chain) in Table 3-3 on page 19.
5. Remove any excess cable from inside the enclosure. Tighten the serial cable cord grip.
Use the following table for wiring positions.
Table 2-3. Serial Communications Wiring
Connector Pin Assignment Function Port Position
J1 1 I/O 2 Digital I/O
2 I/O 1
3 GND
4 +5
J2 1 RX+ (20mA) Port 1 (20 mA)
2 RX- (20mA)
3 TX+ (20mA)
4 TX- (20mA)
5 V+ (20mA)
6 GND (20mA)
J3 1 RTS Port 2 (RS-232)
2 DTR
3 RX
4 TX
5 GND
6 GND
J4 1 TX Port 3 RS-232 or
Com Option Port
2 RX
3 GND
4 TX Port 4 RS-232 or
Com Option Port
5 RX
6 GND
J5 1 +V Input Power Input
2 +V Input
3 - V Input (GND)
4 - V Input (GND)
J7 Header Com Port Option Slot Port 3 and 4