4
3.
Hardware Description
Connectors
The ModbusLink-M/S modules support the Modbus protocol (RTU mode) over RS-232(default) or RS-485,
selectable via a simple command. The external IP6 rated DB9 connector should be used for communication
with Modbus loggers/Sensors using RS-232. For interfacing with a modbus logger/sensor over RS-485, a 5-
terminal connector is provided. The module can also be provided external power via the 5 pin connector.
Please refer to Table 1 for a detailed description of the connector.
The ModbusLink modules can be connected to a PC via the 10-pin header J4 using a 10pin to DB9F cable
(6411-1382-24) for configuration/debug purposes.
Figure 1 – ModbusLink ports
DB9 Connector
Modbus ( RS232)
PC Configuration port
8-16v Power input
RS485-A/B
RS485-A/B
Modbus (RS-485)
8-16v Power input
6411-1382-24
