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SS20 Hardware

SS20 User Guide

USB Port
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IN Rx
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Output
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Input
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Relay
Relay
RS232 Device
RS232 Device
RS485 Device
RS485 Device
DIN Rail Bus Connection
DIN Rail Bus Connection
Status Light
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USB Mode Switch
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OUT Tx
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OUT Rx
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COM1
RS232 Device
COM1<div>RS232 Device</div>
COM2
RS232 Device
COM2<div>RS232 Device</div>
Power Supply
10-30V DC
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Power

Connect a 10-30V DC power supply to the 4 position terminal block (bottom level).

Input Ports COM1 & COM2

Both COM1 and COM2 are RS-232 input ports and can be wired to separate independent SCADA Hosts, Master PLC’s, HMI’s, etc. either directly or typically via radio networks, cell modems, terminal servers, or other communication media. COM1 & COM2 are wired via 4 position terminal blocks (top and middle level).

Relay

This Solid State Form C relay is used to indicate communications failure when the Com Watchdog function of the SS20 is enabled. Normally Open (NO), common (COM), and Normally Closed (NC) terminals are isolated dry contact connections wired via 4 position terminal block (top level). (see Configuration section for more information)

Out RS-232 & RS-485

The SS20’s single output port is available as both RS-232 and RS-485 formats. Slave devices can be attached to either or both of the output interfaces providing that each device is uniquely addressed by the communications protocol used. The RS-232 interface has Tx, Rx, and Ground connections as well as a RTS handshaking line that can be used to key a radio or modem (with programmable delay). The RS-485 interface is Galvanically isolated from the rest of the circuitry and power supply and supports 2-wire half duplex mode of operation. Connections are –A (inverting) and +B (non-inverting) differential data lines and an isolated ground connection (it is important to wire the isolated ground to all devices attached to the port)

USB Port

The SS20 has an integrated high retention force USB type B connector for connection to a field laptop for configuration, maintenance, and troubleshooting. The function of the USB port when connected depends on the USB Mode Switch next to the USB connector.

USB Mode Switch

The USB connection can be used in the following 3 modes of operation,

GUI Mode This mode is used to configure the SS20 when connected to a computer running the SCADALink SS20 GUI software. The software is included on a USB stick shipped with the device or available online at www.scadalink.com.
TAP Mode This mode enables the integrated protocol analyser in the SS20 and streams the Hexadecimal traffic from both ports (send and receive) as well as a transaction time count to the GUI’s Data TAP window or any generic ASCII terminal. This is useful for diagnostics and troubleshooting of communications problems as well as determining appropriate timeout values for the SS20 and master/host no-response timeouts.
(see Data TAP for more Information)
LOI Mode This mode overrides both input COM ports when a USB cable is plugged in and provides a dedicated USB to serial connection from the field laptop to the downstream devices connected to the output ports of the SS20. This allows programming and maintenance of the connected devices without disconnecting or changing any wiring and without the need for laptops with legacy DB9 serial ports or additional USB and RS-485 converters.
(see LOI for more Information)

LED Indicators

Status LED Green = Normal operation
Red = Com Fail Alarm.
Red (Flashing) = Firmware missing or corrupt (see Tools for more information)
Amber = USB Connected
IN Rx LED Green = COM 1 data message received.
Red = COM 2 data message received.
Amber = Possible Host Timing fault (host timeout could be too low).
OUT Tx LED Green = COM 1 data message sent.
Red = COM 2 data message sent.
OUT Rx LED Green = COM 1 data response received.
Red = COM 2 data response received.

Din Rail Bus Connection

The slot on the underside of the unit mates with the optional “Din-Rail Bus Adapter” which allows the SS20 to connect to Bus slave devices such as the “SCADALink 485HUB” when the 485HUB(s) are connected via the bus they provide an additional 4 individually isolated RS-485 output connections and one additional RS-232 output connection per unit.

hardware.txt · Last modified: 2017/01/10 13:50 by mshen