RM-232-485-4 Usage Tips

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RS485 Remote I/O
RS232/RS485 Converter

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The RemoteTRAK RS232 to RS485 converter solves many problems:

¢	No plug in cards are required in your computer. Any RS232 port can be used.
¢	All RS485 parameters are pre-configured to preferred RemoteTRAK communications. No jumpers need be set. No guess-work or difficult manuals to read.
¢	This converter can be connected to an RS232 port on a VersaTRAK RTU or Gateway. There is no need to swap to an RS485 model to add RemoteTRAK I/O to SIXNET systems.
¢	The isolation between the power input / RS232 port and the RS485 ports increases system reliability by eliminating ground loops in long distance wiring.
¢	Four ports allow you to wire complex star configurations (multiple RS485 network arms).
¢	Four ports allow you to wire up to 128 modules. (The RS485 standard recommends only 32 drops on a single party-line.)

RS232 Wiring Tips

For your convenience, two wiring options are provided. You may wire the RS232 signals to the screw terminals (1-4) on the base. Alternatively, you may plug a standard null modem cable (part number ST-CABLE-PF) onto the DB9 connector on the face of this module. The CTS and RTS handshaking lines are not used by this module. (The RS485 transmit enable signal is automatically generated in this module.) The DTR output on this module is permanently tied high for your convenience.

Terminating RS485 Wiring

Jumper the 485 TERM and 485(-) terminals together if this module is the last station on any RS485 party-line (only one cable connected to the port). Termination avoids signal reflections and improves reliability. Do not terminate intermediate stations (with two cables on their port) because excessive termination needlessly loads the cable (draws current) and reduces signal strength.