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W&T
RS232 <> 20mA Interface Converter
Subject to error and alteration
RS232 <> 20mA S5 Interface Cable, Model 84004
Function
The Model 84004 cable interface converts an RS232 interface
into a passive current loop interface while providing a 20mA
data channel in each direction. The converter is intended
exclusively for connecting active current loop devices which
provide the loop current for both the Rx loop and the Tx loop.
To connect passive devices, use the W&T Universal Interface
RS232 <> 20mA models 84001 or 84201.
The cable is connector-compatible with PC’s having a 9-pin
RS232 port and with the Siemens automation device families
S5 100U, S5 115U, S5 135U and S5 155U (programming port).
The included adapter also allows you to use the cable in PC’s
with a 25-pin port.
Supply voltage with galvanic isolation
The Interface is powered from the connected signal lines and
therefore needs no external power supply. This makes the
converter ideal for mobile applications.
Both ports on the Interface are galvanically (opto-coupler)
isolated from each other with an isolation voltage of min.
4000 volts RMS.
Serial parameters
It is not necessary to configure the Interface for the serial
transmission parameters (baud rate, data format and parity).
The transmission speed can be selected as desired between
1200 and 57,600 baud. The corresponding hardware hands-
hake lines are jumpered on the RS232 side, so that the interface
of the connected RS232 device is enabled.
