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SECTION 7 - OPERATION
1
2
3
4
Number
Description
TP3 +5 V
1
TP2 +3.3 V
2
SD Card
3
JP4, JP5, JP6
Remote Setpoint
4
Jumpers
U5 RTC/BRAM
5
Figure 27 - New 331-03478-xxx microboard
108
19
20
5
6
Number
Description
Power LED
6
Status LED
7
Power LED
8
Port 2 RS485 to
E-Link/SC-EQ
9
or Modbus
(RTU)
U23 Port 2
10
RS-485 Driver
18
17
8
7
Number
Description
Port 2
11
RX2, TX2
PORT 2 RS-232
12
Printer or Modbus
VSD RX
13
VSD-TX
U18 VSD
14
RS-485 Driver
U26 PORT 1
15
RS-485 Driver
Form 201.28-NM1.1
Issue date: 08/06/2021
16
15
14
13
12
11
10
9
LD19331
Number
Description
Port 1
Native BAS
16
(BACnet and
N2)
17
TP1 GND
18
TP4+12 V
19
TP5 + 15 V
20
TP10 + 24 V
JOHNSON CONTROLS
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