Lighthouse RLPC 0.1m, Operating Manual

Page: 37 / 118

Communications
248083227-1 Rev 8 4-5
RS232/485 IN Port
The RS232/485 IN port RJ-45 connector has both RS232 and RS485
lines. The pinouts are shown in Table 4-4.
An RJ-45 to DB-9 modular adapter to connect the RLPC to a computer
COM port is available from Lighthouse. Remove the RS485 Adapter
Cable when RS232 connection is needed and reinstall the RS485
Adapter when the RS485 network is to be restored (see “RS485
Adapter Cable” on page 3-4). The pinouts of the RJ-45 to DB9 adapter
are shown in Table 4-5.
WARNING:
When
daisy-chaining multiple
instruments together,
only connect IN ports to
OUT ports. Do NOT
connect an IN port to
another IN port using a
cable that has all 8 wires
in use; board damage
will occur.
If the RS485 Adapter
Cable is used, no
damage will occur but
data will be lost.
Table 4-4 RJ-45 Pinouts
RJ-45 Pin Signal Name
1 RS232-TX
2 RS232 RX
3 RESERVED for future use
4 RS485B
5 RS485A
6 RESERVED for future use
7 RESERVED for future use
8 GND
Table 4-5 RJ-45 to DB-9 Connections
RJ-45 Pin Signal Name DB-9 Pin
1 TX 2
2 RX 3
8 Ground 5
3 DTE 7