TXP-C20_Instruction_Manual_(Rev1.0)
REV – 1.0
[34-2900-0207-5 ]
28
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P a g e
Figure 4-7 – Optional 4-20mA Analog Output Board
4.2
Modbus RS-232 / RS-485 Interface Option
The Modbus option PCB add both RS-232 and RS-485 Modbus RTU slave ports. Figure 4-8 shows this optional PCB
which mounts to connectors on the upper right corner of the TXP-C20 motherboard. TB1 provides two pairs of T/Rx
terminals and a floating terminal for shield continuation. This makes it easy to multi-drop TXP-C20’s onto an RS-485
cable without doubling wires into the same screw terminals. RS-232 interface may be made by connecting to DB9
connector S1. Section 3.2.1 lists all Modbus registers and their function codes.
Follow correct IEEE RS-232 and RS-485 installation guidelines when using the Modbus RS-232 / RS-485
Interface option.
Содержание TracXP TXP-C20
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