User manual

Digital Monitor AMC-1DBx Series User Manual
18
The BAS RS-485 interface is provided on a dual-row, 4-pin terminal block. Pins on the upper
row are wired in parallel to the lower row to facilitate placing the monitor in the middle of the
bus, thereby requiring two wires per connection. The terminal block supports wire gauges from
14 to 30 AWG. Silk screening is provided on the PCB to identify each pin, by function.
Table 4-4 shows the pin-out for the dual-row 4-pin terminal block.
Figure 4-6 BAS RS-485 Interface
Table 4-4: Dual-Row 4-Pin Terminal Block Pin-out
Signal
Terminal Block
Pin #
Cable Shield
1
RS-485 A Signal
2
RS-485 B Signal
3
Ground
4
4.1.2.3 Termination
For each RS-485 interface, field configuration is provided. See Table 4-5.
Table 4-5: RS-485 Field Configuration
Strap Position Interface Strap
Location
Not at
end of bus
End of Bus
DC Termination
End of Bus
AC Termination
To Building Automation J16 remove 1-2 2-3
To MODBUS 1 J22 remove 1-2 2-3
To MODBUS 2 J17 remove 1-2 2-3
To MODBUS 3 J15 remove 1-2 2-3
To MODBUS 4 J14 remove 1-2 2-3