PLX3x Series ♦ Multi-Protocol Gateways Hardware Information
User Manual
ProSoft Technology, Inc. Page 45 of 215
January 25, 2018
4.2.1 Serial Port Specifications
This type of connection is used when the device connected to the gateway
requires hardware handshaking (control and monitoring of modem signal lines).
To enable hardware handshaking, set the port configuration to use RTS/CTS
handshaking. (For MBS protocol, set the Use CTS Line parameter to Yes. For
ASCII protocol, set the Handshaking parameter to Yes).
4.2.2 RS-232 - Null Modem (DTE without Hardware Handshaking)
This type of connection can be used to connect the gateway to a computer or
field device communication port.
Note: If the port is configured to use RTS/CTS handshaking, then a jumper is required between the
RTS and the CTS line on the gateway connection.
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