Laurel Electronics Custom ASCII Protocol For Laureate Series 2 Digital Panel Meters, Counters, Timers & L-Series Transmitters - Manual (Page 9)

9
4. TRANSMITTER CONNECTOR WIRING
Signal
conditioner
board
P3 Solid
state relays
P1 Power
input
P6 Signal
input &
excitation
output
P2 Serial
data I/O P4 Analog
output
1
2
3
4
5
6
RS485 RS232
6 N/C TX
5 ARX RX
4 ATX NC
3 GND GND
2 BRX GND
1 BTX N/C
3 Power GND
2 AC neutral or -DC
1 AC high or +DC
See below
for different
signal types
Analog out - 1
Analog out + 2
AL2 1
AL2 2
AL1 3
AL1 4
5
4
3
2
1
9
8
7
6
RS232 cable with
rear view of
DB9
connector to PC
E1
E4
E6
E3
E2
a
b
c a b
a b
c d
a b c d
Serial Signal Duplex Jumpers Termination Resistor*
Full None
E6 a = Transmit
E6 c = Receive RS485
Half E6 b + d** E6 c
RS232 Full None None
* The termination resistor jumper
settings should only be selected
if the transmitter is the last device
on an RS485 line longer than 200
feet (60 m).
** Or jumper external BTX to BRX
and ATX to ARX (same effect as
internal jumpers).