B&B Electronics Zlinx 485 - Manual (Page 22)

Hardware
Manual Documentation Number: Zlinx485m-1808
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Figure 23. Modbus Mode devices may be PLCs, RTUs, DCSs, or other Modbus devices,
with links up to 32 nodes per Modbus network
Connecting the Hardware
With an RS-232 connection, the Zlinx 485 Base module is connected to a Modbus
device via a DB-9M connector and an RS-232 cable. If the connected Modbus device is
configured as a DTE device, use a straight-through cable. If the connected Modbus
device is configured as a DCE device, use a null modem cable.
Always check the interface specifications of the Modbus device to determine whether it is a DTE or
DCE before connecting.
RS-232 may be connected to a PC using an RS-485 Converter, to allow using Modscan 32 to poll
the registers.
For RS-422/485 wiring, the Zlinx 485 Base module is connected to the Modbus device
via the RS-422/485 terminal block. In RS-422/485 four-wire mode a cable containing
two pairs and a ground/shield is used. In RS-485 two-wire mode a cable containing one
pair and a ground/shield is used.
Power is supplied to the converter via the power supply terminal block.