User manual

Digital Monitor AMC-1DBx Series User Manual
17
Table 4-2 RS-485 driver IC
Interface IC Location
To Building Automation J175
To MODBUS 1 J176
To MODBUS 2 J177
To MODBUS 3 J178
To MODBUS 4 J179
The four downstream RS-485 interfaces are provided on dual-row, 5-pin terminal blocks. 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. Silks screening is provided on the PCB to identify each pin by
function. Refer to
Figure 4-3: Digital Monitor Components to identify the connectors associated with each
interface. Table 4-3 shows the pin-out for the dual-row t-pin terminal block.
Figure 4-5 Downstream RS-485 Interfaces
Table 4-3: Dual-Row 5-Pin Terminal Block Pin-out
Signal Terminal Block
Pin #
Cable Shield
1
RS-485 A Signal
2
RS-485 B Signal
3
Ground
4
Power
5