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Serial Communication
MJ1 Wiring
RS-232 with full handshaking or RS-485 half-
duplex
RS-485 termination via switches; biasing via soft-
ware
MJ1 Pins
PIN
SIGNAL
8
TXD
7
RXD
6
0V
5
+5V @ 60mA
4
RTS
3
CTS
2
RX-/TX-
1
RX+/TX+
MJ2 Wiring
RS-232 or RS-485 half or full-duplex, software
selectable
RS-485 termination via switches; biasing via
software
MJ2 Pins
PIN
SIGNAL
8
232 TXD
7
232 RXD
6
0V
5
+5V @ 60mA
4
485 TX-
3
485 TX+
2
485 RX- or RX/TX-
1
485 RX+ or RX/TX+
NOTE: Attach optional ferrite core with a minimum of two
turns of serial cable.
Ethernet
Green LED indicates link - when illu-
minated, data communication is available.
Yellow LED indicates activity - when
flashing, data is in transmission.
COMMUNICATIONS
CAN Communications
DIRECTION
OUT
IN
GROUND
OUT
OUT
IN
IN/OUT
IN/OUT
DIRECTION
Dip Switches
OUT
IN
GROUND
OUT
OUT
IN
IN or IN/OUT
IN or IN/OUT
PIN
1
2
3
The DIP switches are used to provide a built-in termination
to both the MJ1 port and MJ2 port if needed. The ter-
mination for these ports should only be used if this device is
located at either end of the multidrop/daisy- chained RS-
485 network.
Page 7
CAN Pin Assignments
PIN
SIGNAL
1
V-
2
CN_L
3
SHLD
4
CN_H
5
V+ (NC)
Solid/Stranded Wire: 1 2-24 awg (2.5-0.2mm).
l
Strip Length: 0 .28" (7mm).
l
Locking spring-clamp, two-terminators per con-
l
ductor.
Torque, Terminal Hold-Down Screws: 4.5 – 7 in-
l
lbs (0.50 – 0.78 N-m).
V+ pin is not internally connected, the SHLD pin is
l
connected to Earth ground via a 1MΩ resistor and 10
nF capacitor.
DIP Switches
NAME
MJ1 RS-485
Termination
MJ2 RS-485
Termination
Bootload
DESCRIPTION
CAN Ground – Black
CAN Data Low – Blue
Shield Ground – None
CAN Data High – White
No Connect – Red
FUNCTION DEFAULT
ON = Ter-
OFF
minated
ON = Ter-
OFF
minated
Always Off
OFF
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