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Anti-Streaming Timer
The TC2401 (Slave unit) has a built-in Anti-Streaming Timer that prevents a defective RTU or PLC from
bringing down the entire network. The electrical channels (TxD & RTS) from the RTU(s) are monitored
individually; they are based on data (not control) signals. When the Anti-Streaming Timer is exceeded
(after about 4 seconds of continuous transmission), an alarm is triggered and the RTU's defective electrical
channel is automatically disconnected, preventing the unit from jabbering continually. The timer will
automatically reset once the jabbering subsides. The Anti-Streaming Timer can be disabled by sliding the
Slave's internal DIP switch SW5 to the right (Off) position.
Electrical Specifications
The electrical signal interface for the TC2400/TC2401 can be RS-232 or RS-422/485 (DCE only). Data
rates up to 120 Kbps are supported for RS-232 Asynchronous DC (no handshake), or two Async channels
without control. Data rates up to 1 Mbps are supported for RS-422/485 Asynchronous DC (on "AUX1"
port only). The "AUX2" port (secondary channel) supports data rates up to 256 Kbps for the RS-422/485
interface. Data flow is controlled by XON/XOFF and RTS/CTS. The electrical connectors are RJ11
Female. Two RJ11 ports ("AUX3" & "AUX4") are not used.
Electrical Signal Interface Connections & Pin Assignments
The electrical signal interface is connected to the host or RTU via an RJ11 female connector at the rear panel
of the TC2400/2401. The RJ11 DCE pin assignments are as illustrated in Figures 10, 11 & 12.
For RS-232 interfaces, pin 5 is the input (TxD) pin while pin 4 is the output (RxD) pin.
RS-232 Asynchronous
For RS-232 interfaces, pin 5 is the input (TxD) pin while pin 4 is the output (RxD) pin.
RJ-11 JACK
RJ-11 JACK
Figure 10. RS-232 Pin Assignments & Virtual Connection
RJ-11 JACK
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TC2400 & TC2401
Ring User's Manual
Rev. 1.7
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