B&B Electronics Zlinx 485 - Manual (Page 11)

Hardware
Manual Documentation Number: Zlinx485m-1808
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Figure 7. Local Bus Connector Location
RS-422/485 and I/O connectors for base and expansion modules are removable (plug in)
screw terminal blocks located on the front and top of the unit. Terminal spacing is 3.5
mm. Depending on the specific model, the number of terminals may vary. The maximum
is 16 terminals (two 8-terminal blocks) for I/O, with an additional 5 terminals for RS-
422/485 on the base module.
The Serial Port Connector on the Zlinx 485 is an RJ45 female connector (configured as
a DCE) device supporting RS-232 serial communications including TD (Pin 3 on the
DB9 end), RD (Pin 2) and GND (Pin 5) signal lines. If the Modbus device you are
connecting to the Zlinx Base Module is configured as a DTE device you will use a
straight-through serial cable. If the Modbus device is configured as a DCE device, use a
null modem cable or adapter.
Refer to Appendix C for connection pin-outs .
RS-422/485 Connector
The RS-422/485 connector on the Zlinx Base module is a five position removable
terminal block with screw downs. The connector provides screw connections for:
• Terminal 1 – TDA(-)
• Terminal 2 – TDB(+)
• Terminal 3 – RDA(-)
• Terminal 4 – RDB(+)
• Terminal 5 – GND