Exchanger

Operation

The ADVICE Exchanger series is a combination of a interface converter, modem eliminator, and line driver in a single package. Each unit provides two of the following interfaces: RS232, V.24, RS449, RS530, V.11, or V.35. The Exchanger provides the following functions:

• Interface Converter - The Exchanger will provide conversion from each of the selected interfaces to the other in all modes of operation. Each port (A and B) converts the signals to TTL to the crossover section of the unit. At this point all options are selected. Signals are converted from TTL back to the proper interface on the opposite port.
• Modem Eliminator - The clocking option allow for use as a modem eliminator. The basic configuration is set up as DCE to DCE and clocks are provided by the on board (n x 56K, n x 64K) clock. Other clocking options are available, such as Terminal Timing, Mixed Clocks and Single Point Clock.
• Line Driver - Each interface is completely re-powered, which allows for longer runs. Depending on the interface and speed this could add 100 meters to the communication length.

Setting the Jumpers

The basic operation revolves around the two ports (A and B). The first set of jumpers after each port select the operation of the port. DCE (Connects to a DTE) or DTE (Connect to a DCE). This will select the proper pins for TD, RD, TC, RC, XTC, RTS, CTS, DTR, DSR, DCD and sets up the interface. Port A is controlled by Jumpers J3,J4,J5. Port B is controlled by Jumpers J7,J9,J10. These jumpers must be moved as a group, ie. must be all set to DTE or DCE without mixing.

The next Jumpers J2 and J11 select the operation of RTS, CTS, as either Local or Remote (RMT). Local means that Port A RTS will be directed back to Port A CTS and Port B RTS will be directed to Port B CTS. Remote means that the signals will cross from port A to Port B. Depending on the mode (DCE or DTE) of each port the signal connects to the correct pin as follows:

• Local mode:
• Port A CTS connects to Port A RTS
• Port B CTS connects to Port B RTS
  
• Remote mode:
• Port A DCE, Port B DTE
• Port A CTS connects to Port B CTS
• Port A RTS connects to Port B RTS


• Port A DCE, Port B DCE
• Port A CTS connects to Port B RTS
• Port A RTS connects to Port B CTS


• Port A DTE, Port B DTE
• Port A RTS connects to Port B CTS
• Port A CTS connects to Port B RTS


• Port A DTE, Port B DCE
• Port A RTS connects to Port B RTS
• Port A CTS connects to Port B CTS

The next set of jumpers (J16,J15) select operation of DSR and DTR. This operation is similar to RTS and CTS. These jumpers must be moved as a set, ie. Local or RMT only.

• Local mode:
• Port A DSR connects to Port A DTR
• Port B DSR connects to Port B DTR.
• Remote mode:
• Port A DCE, Port B DTE
• Port A DSR connects to Port B DSR
• Port A DTR connects to Port B DTR
• Port A DCE, Port B DCE
• Port A DSR connects to Port B DTR
• Port A DTR connects to Port B DSR
• Port A DTE, Port B DTE
• Port A DSR connects to Port B DTR
• Port A DTR connects to Port B DSR
• Port A DTE, Port B DCE
• Port A DSR connects to Port B DSR
• Port A DTR connects to Port B DTR

Clocking:

Jumpers J24 and J23 select clock source for Ports A and Ports B. These are typically moved in pairs, but some strange clocking options can be achieved by not doing so. "IN" refers to the on-board internal Nx8000 Hz clock if your unit is so optioned. If you are not sure, check Y1 if there is a crystal oscillator installed you have it. "EXT" allows you to connect to the external clock sources.

Jumper J25 allows for a common clock source from either Port A or B External Transmit Clock. Further clocking sources are controlled by J19,20,17,22,18,21. The following is a list of examples of how to set up the clocks. It is important to determine the mode of the DTE/DCE selector first for each port as these control the direction of signals from and to the connectors.

Clock Configurations

Front Panel

The front panel can indicate many problems. First each port must be optioned (DTE or DCE). This is what the port on the Exchanger is optioned to appear as not what it is connected to. (ie. A port optioned as a DTE will typically connect to a DCE device.)

The Data LEDs are tri-state and should toggle between red and green, giving a orange color when data is present. If they are stuck either Red or Green something is wrong with the data path. Note: These LEDs will turn more red as the speed increases.

The TC and RC LEDs are tri-state and should toggle between red and green, giving a orange color when clocks are present. If they are stuck either Red or Green something is wrong with the clock set up or clocks are not present at the interface. Note: These LEDs will turn more red as the speed increases.

Rear Panel

The rear panel has two connectors for the interfaces and a subminiature jack for the power. The Exchanger has on-board power regulation so only a unregulated supply is needed. Refer to the technical spec's for more detail.

Setting the Options

To change options remove the two screws located on the bottom of the unit and slide the case lid off. Refer to the other section of this manual for detail of the jumper settings. Refer to the Exchanger Jumper Routings chart for how the signals are routed.

Interface Connections

Internal Clock Settings

If your unit has the optional internal clock it can be set for any frequency from 16 kHz to 2.048 MHz in 8 kHz increments. However, don't expect an RS232 interface to operate at speeds above 128 kbps. Set the dip switches to the following positions (open/closed) to obtain the desired frequency.

• C = On, Closed
• O = Open, Off

Specifications

V.35, RS530 Balanced Level Converters:

• Input:
• Common Mode Range: +/- 0.2 to 14 V max.
• Impedance: 150 Ohms
• Protection: 2 kV ESD
• Output:
• Common Mode Range: 0 to 5.0 V max.
• Current Capacity: +/- 150 mA
• Protection: Thermal Shutdown

V.35, RS232 Unbalanced Level Converters:

• Input:
• Common Mode Range: +/- 3 to 25 V max.
• Impedance: 2 kOhms
• Protection: 2 kV ESD
• Output:
• Protection: Thermal Shutdown Common Mode Range: +/- 10 V
• Current Capacity: 100 mA

Power

• Wallmount power unit: (UL/CSA)
• Input: 120VAC, 60Hz, 3W
• Output: 9VDC, 500mA

Dimensions

• 8 x 6.3 x 2 in., 20 x 16 x 5 cm
• 1.9lb, 0.9kg (with AC adapter)