SENS MicroGenius S2/S4 Technical Manual
20
TWO PORTS:
Connect J1939 or Modbus
to one port
Pin 1
Pin 1
adhesive/glue properly rated for the application material and temperature, such as Super Glue®.
Temperature compensation is disabled by connecting a short across the remote temperature sensor
terminal block or by setting the temperature compensation slope to zero using the keypad or SENS Setup
Utility. See section
9.12
for further information regarding temperature compensation. A 50-foot remote
temperature sensor is available to order separately (SENS p/n 209481).
6.7.
SAE J1939 Communications Setup (CANbus)
Every charger includes SAE J1939 (CANbus) communications. The J1939 interface provides a highly
reliable, low cost method of delivering to the genset controller all information that NFPA 110 requires
the battery charger to deliver. To be operational, the genset controller must support the charger J1939
connection. Contact your genset supplier to determine if your genset supports a J1939-connected
charger. See section
10
for further information on J1939 operation and registers.
J1939 communications are disabled by default and until the BCH address is configured (see section
6.7.1). Connect J1939 communications using a twisted pair cable at the RJ-45 connector on the
alarm/communications circuit board located on the inside front cover (see Figures 1-3 for location in
charger and Figure 7 for detail). Two RJ-45 ports are provided. The ports are in parallel and either port
may be used. See Table 10 for connector pinout. Communications are non-isolated and referenced to
negative battery terminal. An adapter from RJ-45 to an 8-position terminal block may be connected to
the RJ-45 connector and is available to order separately (SENS p/n 208026).
Figure 7 – RJ-45 Connection
Table 10 – Connector Pinout
Pin #
Purpose
1
J1939 Data High/SENSbus
2
J1939 Data Low/SENSbus
3
No connect pass-through
4
Modbus –D0 (B)
5
D1 (A)
6
No connect pass-through
7
Power*
8
Common (referenced to battery negative)
*Main circuit PCA only, used for interconnect between SENS devices
6.7.1.
Battery Charger (BCH) J1939 Address
Configure the J1939 address using the front panel keypad (J9139 communications are disabled
until this address is configured). J1939 supports two chargers per network cable. Set to address 1
for main charger or address 2 for auxiliary charger. The charger is set to address 1 by default.
For multiple output chargers, J1939 address 1 (main charger) is assigned to charger output A and
address 2 (auxiliary charger) is assigned to output B by default. Use the keypad or the SENS Setup
Utility to configure J1939 addresses to any desired charger output.
6.7.2.
Termination
For proper J1939 operation, a 120-ohm terminator is required at the ends of the J1939 bus. If
multiple devices are on the bus, only the devices on the ends of the network bus need
