Chapter 3. Technical Specifications

This chapter covers technical aspects of the hardware connections as well as power, physical, and environmental requirements for the hardware. This chapter discusses

Multiplexer Serial Ports

All ports are asynchronous, with Data Terminal Equipment (DTE) pinouts and full modem control. Allowed baud rates range from 75 baud to 115.2 Kbaud out. The RS-232 signals supported are TXD, RXD, RTS, CTS, DSR, DTR, DCD, and GND.

Note: The RS-232 serial ports on Challenge and Onyx systems transmit asynchronous data at a maximum rate of 19.2 Kbaud.

The ST-1600 and ST-1616 multiplexer are Data Terminal Equipment devices (DTE). See Figure 3-1 for the pin numbers on the 25-pin multiplexer connector.

Figure 3-1. 25-Pin Connector on the Multiplexer

The Challenge or Onyx system is a DTE device for purposes of serial port connection. See Figure 3-2 for the pin assignment on the 9-pin Challenge or Onyx serial port connector.

Figure 3-2. 9-Pin Connector on Challenge or Onyx Systems

Table 3-1 shows a DTE to DTE serial connection such as would be made between the multiplexer and a Challenge or Onyx system.

Note: Both pins 6 (DSR) and 8 (DCD) on the multiplexer are tied to pin 9 (DTR) on the Challenge or Onyx 9-pin connection.

Table 3-1. 9-Pin DTE to 25-Pin DTE Connection

9-Pin Connector Signal

Pin #

25-Pin Connector on Multiplexer

Transmitted Data (TXD)


3 (RXD)

Received Data (RXD)


2 (TXD)

Request to Send (RTS)


5 (CTS)

Clear to send (CTS)


4 (RTS)

Data Terminal Ready (DTR)


6 Data Set Ready (DSR)

Signal Ground (GND)


7 (GND)

Data Terminal Ready (DTR)


8 (DCD)

Data Carrier Detect (DCD)


20 Data Terminal Ready (DTR)

The RS-232 standard recommends the use of serial cables no longer than 50 feet
(15.2 meters). Longer runs introduce a greater possibility of line noise occurring. This can affect data transmission and cause errors. For cable runs longer than 50 feet (15.2 meters), use an appropriate extender device.

Figure 3-3. 25-Pin to 9-Pin Serial Connection Cable (Challenge and Onyx Systems)

9-Pin (Male) Serial Port

The Origin200 (tty_1 Console port), Origin2000 deskside, and Onyx2 deskside systems use a 9-pin male port to connect to the multiplexer. Figure 3-4 provides the pin specifications for this connector.

Figure 3-4. Origin200 tty_1 Console, Origin2000, and Onyx2 Deskside Serial Port

8-Pin DIN Serial Port

The Origin2000 and Onyx2 rack multimodule system controller (MMSC) ports and the Origin200 AUX port are 8-pin serial connectors. Table 3-2 and Figure 3-5 provide pin specifications for this 8-pin connector.

Table 3-2. 4D Compatible Pin Assignments (RS-232)






Data Terminal Ready



Clear To Send



Transmit Data



Signal Ground



Receive Data



Request To Send



Data Carrier Detect



Signal Ground

Figure 3-5. 8-Pin Serial Port Pinout Assignment for Origin200 System and Origin2000 and Onyx2 Rack System

Multiplexer Power, Physical, and Environmental Specifications

All power requirements are provided by the standalone power supply included with your unit.

The power supply is auto-ranging and comes with a 110-VAC power cord in Japan and North America. All other destinations should use a 220-VAC rated power cord.

Power usage is typically as follows:

  • +5 VDC, 1500 mA maximum, 1110 mA typical

  • 12 VDC, 100 mA maximum (full load), 1 mA (unloaded)

The operating environment for the multiplexer should meet the following specifications:

  • operating temperature: 0°C to 55°C

  • storage temperature: -40°C to 75°C

  • operating/storage humidity: 0 to 95% non-condensing

Each type of multiplexer uses the following amount of space (be sure to allow for all cable connections when choosing a location for placement):

  • depth: 11.0 inches (28.1 cm)

  • width: 8.1 inches (20.6 cm)

  • height: 1.2 inches (3.1 cm)

  • weight: 3.8 lbs (1.7 kg)

The shipping weight of the multiplexer is 14 lbs (6.3 kg), maximum, with power supply, excluding optional cables or other equipment.