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Manual Documentation Number: MES1A/MES1B-2106m PN7138-rev001
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
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straight-through cable. If the connected Modbus device is
configured as a DTE, 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.
The MES1B is connected to its 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.
Typically, the MES1A/B is connected to the network via a hub
switch or router using standard straight-through CAT-5 cable. (If
you are connecting the MES1A/B directly to a PC’s network
interface a crossover Ethernet cable is required.)
Figure 8. MES1A Connections