JDS Uniphase SKB SERIES User Manual

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SKB SERIES

FIBEROPTIC SWITCH MODULE

User’s Manual

Contents

Safety Information, Instructions, and Symbols...................................................................... 1

Safety Information..........................................................................................................1

Power Requirements........................................................................................... 1

Safety Instructions.......................................................................................................... 1

Before Initializing and Operating the Unit............................................................1

Operating the Unit...............................................................................................1

Safety Symbols............................................................................................................... 3

General Information and Specifications ................................................................................. 4

General Information........................................................................................................ 4

Configurations..................................................................................................... 4

Packages............................................................................................................ 5

Components........................................................................................................ 5

Latching and Non-Latching ................................................................................. 5

Channel Switching Times.................................................................................... 6

Confirming Time Between Channels................................................................... 6

Key Features....................................................................................................... 6

Applications......................................................................................................... 6

Standard Accessories......................................................................................... 6

Specifications ................................................................................................................. 7

Getting Started......................................................................................................................... 9

Before Initializing and Operating the Unit........................................................................ 9

Initial Inspection..............................................................................................................9

Operating Environment................................................................................................... 9

Temperature....................................................................................................... 9

Humidity.............................................................................................................. 9

Storing and Shipping.................................................................................................... 10

Claims and Repackaging.................................................................................. 10

Returning Shipments to JDS Uniphase............................................................. 10

Cleaning Connectors.................................................................................................... 11

Storing Fiberoptic Connectors...................................................................................... 12

Handling Fiberoptic Cables........................................................................................... 12

Installing the Switch...................................................................................................... 12

Cabling.............................................................................................................. 13

Installing the Switch .......................................................................................... 13

Operating and Maintenance Instructions............................................................................. 15

Power / Serial Interface................................................................................................ 15

Connecting Multiple Switches............................................................................ 15

Pin Assignment................................................................................................. 16

RS485 Addresses............................................................................................. 17

RS485 Protocol................................................................................................. 17

Parallel Interface........................................................................................................... 21

Pin Assignment................................................................................................. 21

Using SK / SP Emulation Mode.................................................................................... 22

Using the Switch........................................................................................................... 22

SD000330 Rev. D August 2000

Voltage Levels................................................................................................... 22

Line Descriptions............................................................................................... 23

Parallel Protocol............................................................................................................24

Read Cycle ....................................................................................................... 24

Write Cycle ....................................................................................................... 24

Timing...........................................................................................................................27

Error Cycle........................................................................................................ 29

Commands................................................................................................................... 30

Architecture Overview....................................................................................... 30

Command Packet Format................................................................................. 30

Response Packet Format.................................................................................. 31

Parameter Data Types...................................................................................... 31

Byte Order.........................................................................................................31

Common Commands.................................................................................................... 32

RESET.............................................................................................................. 32

IDN? .............................................................................................................. 33

STATUS?.......................................................................................................... 34

ALARM?............................................................................................................35

LERROR?......................................................................................................... 36

EQCLEAR......................................................................................................... 37

TEMP?.............................................................................................................. 37

STIMER?.......................................................................................................... 38

RESET_STIMER............................................................................................... 39

SWITCH............................................................................................................ 40

SWITCH?.......................................................................................................... 40

NUM_SWITCH?................................................................................................ 41

LEARN?............................................................................................................ 41

TST? .............................................................................................................. 42

SAVE .............................................................................................................. 43

RECALL............................................................................................................ 43

Configuration Commands............................................................................................. 43

CONFIG?.......................................................................................................... 43

HITEMP............................................................................................................ 44

LOWTEMP........................................................................................................ 44

SPARES? ......................................................................................................... 45

REPLACE......................................................................................................... 45

SWAP_CHANNEL............................................................................................ 46

LATCHING?...................................................................................................... 46

RESET_CHANNEL?......................................................................................... 47

RESET_CHANNEL........................................................................................... 47

RECALL_FAC_SETTING.................................................................................. 48

SPEED? ............................................................................................................ 48

MODIFY_SPEED.............................................................................................. 49

CONNECTION_TIME?...................................................................................... 49

SET_DEVICE_ADDRESS................................................................................. 50

DEVICE_ADDRESS?........................................................................................ 50

SET_TRIGGER_CMD....................................................................................... 51

TRIGGER_CMD?.............................................................................................. 51

Controlling the Switch using a Printer Port.................................................................... 53

Setting the Computer to EPP Mode .................................................................. 53

SD000330 Rev. D August 2000

Using the Printer Port........................................................................................ 53

For sales and service information,

contact JDS Uniphase or your local representative.

JDS Uniphase Corporation

570 West Hunt Club Road

Nepean, Ontario, Canada

K2G 5W8

Phone: 613 727-1303

Fax: 613 727-8284

E-mail: sales@jdsunph.com

Website: http://www.jdsunph.com

SD000330 Rev. D August 2000

Safety Information, Instructions, and Symbols

Safety Information

Power Requirements

The unit can operate from any DC power source that supplies 5 V. The maximum power consumption is 1 to 2.5 A, depending on the configuration.

Safety Instructions

The following safety instructions m ust be observed whenever the unit is operated, serviced, or repaired. Failure to comply with any of these instructions or with any precaution or warning contained in the user’s manual is in direct violation of the standards of design, manufacture, and intended use of the unit. JDS Uniphase assumes no liability for the customer’s failure to comply with any of these safety requirements.

Before Initializing and Operating the Unit

Inspect the unit for any signs of damage, and read the user’s manual thoroughly.

Install the unit as specified in the

Ensure that the unit and any devices or cords connected to it are proper ly g r ounded.

Operating the Unit

Getting Started

section.

Warning

To avoid the risk of injury or death, always observe the following precautions before initializing the unit:

• If using a voltage-reducing autotransformer to power the unit, ensure that the common terminal connects to the ear thed pole of the power source.

• Willfully interrupting the protective earth connect ion is pr ohibit ed.

• Never look into the end of an optical cable connected to an optical output

device that is operating. Laser radiation is invisible, and direct exposure can severely injure the human eye. For more information, see the user’s manual of the laser source in use.

• Turning off the power to the device does not always block the externally supplied radiation to the connector at the output of the unit.

• Do not use the unit outdoors.

• To prevent potential fire or shock hazard, do not expose the unit to any

source of excessive moisture.

• Do not operate the unit when its covers or panels have been removed.

• Do not interrupt the protective earth grounding. Any such action can lead to

a potential shock hazard that can result in serious personal injury.

Safety – 1

• Do not operate the unit if an interruption to the protective grounding is suspected. In this case, ensure that the unit remains inoperative.

• Unless absolutely necessary, do not attempt to adjust or perform any maintenance or repair procedure when the unit is opened and connected to a power source.

• Repairs are to be carried out only by a qualified professional.

• Do not attempt any adjustment, maintenance, or repair procedure to the

unit’s internal mechanism if imm ediat e first aid is not accessible.

• Disconnect the power from the unit before adding or removing any components.

• Operating the unit in the presence of flammable gases or fumes is extremely hazardous.

• Do not perform any operating or maintenance procedure that is not described in the user’s manual.

• Some of the unit’s capacitors can be charged even when the unit is not connected to the power source.

Safety – 2

Safety Symbols

The following symbols and messages can be mark ed on the unit (Table 1). Observe all safety instructions that are associated with a symbol.

Table 1: Safety Symbols

Symbol

WARNING

CAUTION

Description

Laser safety. See the user’s manual f or instructions on handling and operating the unit safely.

See the user’s manual for instruct ions on handling and operating the unit safely.

Electrostatic discharge (ESD). See the user’s manual for instructions on handling and operating the unit safely.

Frame or chassis terminal for elect r ical grounding within the unit.

Protective conductor terminal for elect rical grounding to the earth.

The procedure can result in serious injury or loss of life if not carried out in proper compliance with all safety instructions. Ensure that all conditions necessary for safe handling and operation are met before proceeding.

The procedure can result in serious damage to or destruction of the unit if not carried out in compliance with all instructions for proper use. Ensure that all conditions necessary for safe handling and operation are met before proceeding.

Safety – 3

General Information and Specificati ons

General Information

This user’s manual for the SKB Series Fiberoptic Switch Module contains complete operat ing instructions.

The SKB modular 1xN controllable switch controls up to four 1xN optical switches, with configurations up to 100 channels (Fig ure 1). Small and rugged, the switch is designed to be used in embedded applications. It is available in single-mode (SM) and multimode (MM) versions. It has several features that r educe installation and support efforts. T he switch offers low insertion loss and is independent of data form at and direction (bidirectional).

Figure 1: SKB Switch

The standard single-pole config uration consists of a single-common port t hat can be aligned to any one of 26 ports. In electrical ter ms, the SKB switch is a single-pole, 26-throw switch. The switching mechanism implements collimating lenses that eliminate the problems associated with modal noise and provide low insertion loss and high repeatability.

With use of an adapter cable assembly (user supplied), the switch is back ward compatible with the SK Series Fiberoptic Switch Module and the SP Series Fiberoptic Switch Module.

The switch can operate in an enhanced command mode that provides the capability of readable switch parameters.

The optics can be internally connected to provide custom solutions at the cust om er’s request.

Configurations

The SKB switch is offered in a standard chassis with standard software t hat controls numerous configurations. Examples, shown in Figure 2, include

• A single switch with 1xN configuration for N up to 100

• Up to four 1xN switches with a total channel count of up to 100 (for example, four 1x25

switches, two 1x50 switches, and so on)

• Up to two MxN blocking switches for a total M+N channel count of 100 (for example, two 25x25 switches, one 50x50 switch, and so on)

• 1xN switches plus relay switches and passive devices, such as couplers (for example, two 1x25 stepper motor switches with two relay switches and couplers)

General Information and Specifications – 4

Figure 2: Configuration Examples

A 1xN configuration is shown more closely in Figure 3.

Figure 3: 1xN Configuration

Packages

The SKB switch is available in two package configurations:

• Package 1 can accommodate up to two 1xN switches with a single control interface

• Package 2 can accommodate up to four 1xN switches with a single control interface

Components

For large channel count switches, a high-precision stepper motor is used to align optical channels. The use of collimating lenses m inim izes insertion loss.

For some applications, optional relay-based switches can be used. Passive devices can be incorporated on a custom basis.

Latching and Non-Latching

Latching and non-latching SKB switches have the same functionality, command set, and specifications, with the following dif ferences:

General Information and Specifications – 5

• On power off, the non-latc hing version does not guarantee an optical connect

• W hen reapplying power to the SKB switch, a latching version stays on the latched channel

and a non-latching version resets to a configured known position

Channel Switching Times

The time to a sequential channel (f or example, going f rom channel two to three) can appear to be greater than the specification for the adjacent channel. This discrepancy can be due to a few reasons:

• If the user has used the REPLACE command to replace a damag ed channel, that channel is not sequential. Management of the switching order can be done using the SWAP_CHANNEL comm and.

• The factory configuration can be such that a channel was deliberately skipped.

Confirming Time Between Channels

The SKB switch allows the user to confirm the specif ied time to switch between channels. The CONNECTION_TIME? query physically checks the time by switching between the start and destination channel and outputs the results f r om t he internal clock.

Key Features

• Up to 100 channels

• Typical insertions loss 0.4 dB (MM) for up to 26 channels

• Parallel and RS485 serial interface control

• Compact modular package suitable for original equipment manufacturing (OEM)

Applications

• Remote fiber test systems in telecomm unicat ions net work s

• Fiber network restoration

• Fiberoptic component test and measurement

Standard Accessories

• 3 mm fiber cables or 900 µm f iber pigtails (customer specified)

• User’s manual

General Information and Specifications – 6

Specifications

The following optical specifications describe t he warranted characteristics of the unit (Table 2). Supplementary specifications describe the typical non-warranted per f orm ance of the unit (T able

3).

Table 2: Optical Specifications

1,2,3

Parameter

Typical (Maximum)

N<26 Non-Latching

N<25 Latching

Typical (Maximum)

100 Non-Latching

≤≤≤≤N≤≤≤≤

92 Latching

≤≤≤≤N≤≤≤≤

Insertion loss SM MM

0.5 (0.7) dB

0.4 (0.6) dB

0.8 (1.2) dB

0.7 (1.0) dB

Wavelength SM MM

850 to 950 nm or 950 to 1350 nm

1290 to 1670 nm

Return loss SM MM

62 (57) dB 25 (20) dB

55 (45) dB

20 (20) dB Polarization dependent loss (SM) 0.02 (0.04) dB 0.04 (0.08) dB Insertion loss stability

±0.02 (0.025) dB ±0.03 (0.04) dB

Change in insertion loss during power on-off cycle; latching version SM MM

Repeatability

sequential switching random switching

±1.0 (2.0) dB ±1.0 (2.0) dB

±0.005 (0.01) dB

±0.01 (0.05) dB

±2.0 (4.0) dB ±2.0 (4.0) dB

±0.01 (0.03) dB

±0.03 (0.08) dB Crosstalk -90 dB -80 dB Switching time (one channel/each

additional channel) low speed, high accuracy medium speed

Optical input power Lifetime Interface

1All specifications referenced without connectors.

All optical measurements taken after temperature has stabilized for one hour.

All specifications are at low speed setting. Repeatability can be affected by increasing speed.

Return loss specifications based on 1 m pigtail length.

Repeatability measured after one-hour warm-up.

25/15 ms 20/15 ms

at least 10 million cycles

parallel and RS485 serial

300 mW continuous

General Information and Specifications – 7

Table 3: Other Specifications

Electrical

Input voltage Power consumption

Physical

Dimensions (W x H x D) package 1 fiber version package 1 cable version package 2 fiber version package 2 cable version

Weight

Environmental

Operating temperatur e Storage temperature Humidity

5 ±0.25 V DC 1 to 2.5 A maximum, configur ation dependent

7.82 x 2.78 x 14.00 cm (3.08 x 1.095 x 5.51 in)

7.82 x 2.78 x 17.17 cm (3.08 x 1.095 x 6.76 in)

13.84 x 2.78 x 14.00 cm (5.45 x 1.095 x 5.51 in)

13.84 x 2.78 x 17.17 cm (5.45 x 1.095 x 6.76 in) depends on configuration

0.6 kg maximum for package 1 configuration 1 kg maximum for package 2 configuration

-35 to 75 °C

-40 to 85 °C maximum 95% RH from -35 to 75 °C

General Information and Specifications – 8

Getting Started

The SKB Series Fiberoptic Switch Module package consists of the switching unit with fiber pigtails.

Before Initializing and Operating the Unit

Inspect the unit for any signs of damage.

Read the user’s manual thoroughly, and become familiar with all safety symbols and instructions to ensure that the unit is operated and maintained safely.

Initial Inspection

Warning

To avoid electrical shock, do not initialize or operat e the unit if it bears any sign

Check that the unit and contents are com plete:

1. Wear an anti-static wrist strap and work in an elect r ostatic discharge (ESD) controlled area.

2. Inspect the shipping container for any indication of excessive shock to the contents, and inspect the contents to ensure that the shipm ent is complete.

3. Inspect the unit for structural damage t hat can have occurr ed dur ing shipping.

of damage to any portion of its exterior surface, such as the outer cover or panels.

4. Keep the packaging.

Immediately inform JDS Uniphase and, if necessary, the carrier if t he contents of the shipment are incomplete, if the unit or any of its components are damaged or defective, or if the unit does not pass the initial inspection.

Operating Environment

In order for the unit to meet the warranted specificat ions, the operating environment must meet the following conditions for tem per ature and humidity.

Temperature

The unit can be operated in the temperat ur e r ange of -35 to 75 °C.

Humidity

The unit can be operated in environments with up to 95% humidity (-35 to 75 °C). Do not expose it to any environmental conditions or changes to environmental conditions that can cause condensation to form inside the unit.

Getting Started – 9

Warning

• Do not use the unit outdoors.

• To prevent potential fire or shock hazard, do not expose the unit to any

source of excessive moisture.

Storing and Shipping

To maintain optimum operating reliability, do not store the unit in locations where the temperature falls below -40 °C or rises above 85 °C. Avoid any environmental condition that can result in internal condensation. Ensure that these t emperature and humidity requirements can also be met whenever the unit is shipped.

Claims and Repackaging

Immediately inform JDS Uniphase and, if necessary, the carrier, if

• The contents of the shipment are incomplete

• The unit or any of its components are dam aged or defective

• The unit does not pass the initial inspection

In the event of carrier responsibilit y, JDS Uniphase will allow for t he r epair or replacement of the unit while a claim against the carrier is being processed.

Returning Shipments to JDS Uniphase

JDS Uniphase only accepts returns for which an approved Return Material Authorization (RMA) has been issued by JDS Uniphase sales personnel. This number must be obtained prior to shipping any material to JDS Uniphase. The owner’s name and address, the model number and full serial number of the unit , the RMA number, and an itemized statement of claimed def ects must be included with the return material.

Ship return material in the original shipping container and packing material. If these are not available, typical packaging guidelines are as follows:

1. Wear an anti-static wrist strap and work in an ESD controlled area.

2. Wrap the unit in anti-static packaging. Use anti-static connecto r covers, as applicable.

3. Pack the unit in a reliable shipping container.

4. Use enough shock-absorbing material (10 to 15 cm or 4 to 6 in on all sides) to cushion the unit and prevent it from moving inside t he container. Pink poly anti-static foam is the best material.

5. Seal t he shipping container securely.

6. Clear ly mar k FRAGILE on its surface.

7. Always provide the model and serial number of the unit and, if necessary, the RMA number on any accompanying documentation.

Getting Started – 10

8. Ship t he unit only to t he addr ess given at the beginning of this document.

Cleaning Connectors

Caution

• Connecting damaged or dirty fibers to the unit can damage the connectors on the unit.

• Never force an optical connector. Some connectors have a ceramic ferrule that can easily be broken.

Optical cable ends need to be cleaned before using them with the unit. The following items are req uired for cleaning:

• Filtered compressed air or dusting gas (for example, T ech Spray Envi-Ro-Tech Duster 1671 gas, available from http:/ /www.techspray.com/1671.htm)

• Lint-free pipe cleaners (for example, from 3M

• Lint-free towels (for example, 10 x10 cm or 4 x 4 in HydroSorb III wipers, available from

http://www.focenter.com/acctech/hydrosobr_wipers.htm)

• Optical grade isopropyl alcohol or optical grade 200° ethanol (do not use r ubbing alcohol, which contains 30% water)

) or lint-free swab

To clean the connectors:

1. Blow the sleeve with filter ed com pressed air (Figure 4).

Figure 4: Connector Cleaning (connector type can vary)

2. Apply optical g rade isopropyl alcohol or optical grade ethanol (do not use rubbing alcohol) to a small area of a lint-f r ee t owel and rub the end of the ferrule over the wet area.

3. Wipe the ferr u le on a dr y area of the lint-free towel.

4. Using the dusting gas or compressed air, blow the end of the ferrule.

5. Apply the alcohol or ethanol to a lint-free pipe cleaner or swab and wipe off the remaining parts of the connector.

6. With the other end of the pipe cleaner or swab, dry the areas cleaned.

3M is a trademark of 3M.

Getting Started – 11

7. Using the dusting gas or compressed air, blow the areas cleaned.

Storing Fiberoptic Connectors

All fiberoptic connectors are shipped with dust caps installed on the connectors . Keep the dust caps on the connectors whenever the fiberoptic connectors are not m ated.

Handling Fiberoptic Cables

The SKB switch can be shipped with fiber pigtail outputs. These pigtails must be handled with care to avoid damage.

Caution

Do not bend the pigtails with a radius under 4 cm (1.5 in) . A small bend radius adversely affects the optical performance of the pigtail and leads to early failure of the pigtail.

Installing the Switch

Caution

• Protection against reverse connection of the power input is not incorporated in the SKB switch. Reverse connection of the power input results in damage to the switch.

• The SKB switch requires that the power input be within the tolerance given at the unit. Care needs to be exercised in the desig n of the system power to compensate for any wiring losses in cabling. Failure to maintain the correct supply voltage can result in unpredictable operation of the switch.

Figure 5 shows the connector locations for the SKB switch. There ar e two connectors on the switch. The first connector is a 25-pin D-subminiature connector used by the parallel interf ace. The second connector is a nine-pin D-subminiature connector, which provides for the power connection. A separate chassis ground connection point also is provided.

Figure 5: Connector and Chassis GND Locations

Getting Started – 12

Cabling

The pin assignment of the parallel interface DB25 female connector is arranged such that shield and data lines are ordered sequentially on a ribbon cable. If discrete wires are used, the shield and data lines need to be twisted together to elim inat e pot ential crosstalk.

The pin assignment of the power/serial (DB9) interface is arranged to accommodate discrete wires. The two data lines are run as a twisted pair, and the power and ground lines are run as a twisted pair. The shield is used to encase both of t he t wisted pairs within the cable.

When using the parallel interface, a common ground is required for the master/slave power supply.

Installing the Switch

To install the switch:

1. Mount the chassis using the four holes provided (Fig ure 6) . An M3 lug with maximum thread depth in the unit of 5 mm is recom m ended.

Fiber Cable

Figure 6: Mounting Hole Locations for Fiber and Cable Versions

Getting Started – 13

2. Connect the ground lug to chassis ground. An 8 mm depth M3 lug with flat and lock washers is recommended (5 mm maximum thread depth in unit) .

3. I nst all the connectors.

4. Connect the power supply to the unit via the nine-pin port. A supply of 5 V ±5%, 1 to 2.5 A maximum (configurat ion dependent ) , is required.

5. Connect a 25- pin par allel cable to the unit. The switch is now ready for use.

For information on installing multiple SKB switches in a net work, see the

Switches

section.

Connecting Multiple

Getting Started – 14

Operating and Maintenance Instructions

Power / Serial Interface

The nine-pin D-subminiature connector is used for power and serial RS485 interface. The interface provides power, differential serial (RS485), and trigger sig nals. The SKB switch has the receiver and driver installed for the RS485 serial interface but not the software for using this interface.

The RS485 interface is a high-speed differential bus used to communicate serially with the master device. The SKB RS485 interface operates over a range of 2400 to 4800 baud and defaults to read mode. The default baud rate for the switch is 2400 baud asynchronous, selfclocking. The RS485 interface only requires three lines to connect to t he differential bus: shield, RXTX-, and RXT X +. The interface must be connected t o pr ovide power to the SKB device.

The RS485 communication settings are:

• Eight data bits

• One stop bit

• No parity bits

• 2400 (default) and 4800 baud rate

Simultaneous operation of serial and parallel int er face is not supported.

Connecting Multiple Switches

Up to 32 RS485 unit loads can be connected to the differ ential bus, so up to 30 SKB switches and one master controller can be used to construct an RS485 network. Exceeding the limit of 32 devices excessively loads the RS485 drivers and attenuates the differential signal. The consequence is reduced noise immunity of the bus and an increased error rate.

The most appropriate method of connecting RS485 nodes is by multidropping the connection from master to node 1, t o node 2, and onward to node n. The bus must form a sing le continuous path. Do no put individual nodes at the end of long branches or spok es from the middle of the bus. If branches are used, make them short. The preferred bus architecture is shown in Figure 7.

Figure 7: Preferred RS485 Bus Architecture

RS485 buses usually require line termination when fast tr ansmissions, high data rates, or long cables lengths are employed. Although no term ination is required if the bus cable length is short and transmission speed is low, it is always recommended.

Terminate bus lines at both ends of t he main cable to prevent signal reflection, f or example. In Figure 7, termination is applied at t he Master node and SKB n node.

Operating and Maintenance Instructions – 15

The common method of termination is parallel line termination, whereby a resistor is placed across the differential lines at the most extreme end of the bus (SKB n+1). The resistor value must be equal to the characteristic impedance of t he cable. In practice, the resistor value needs to be slightly higher than characteristic impedance. A common mistake is to connect a terminating resistor at each node in t he RS485 bus. This action causes line problem s when more than four nodes are connected because the active bus driver is loaded excessively.

The maximum cable length specified f or RS485 buses is 1219 meter s (4000 feet) . Generally, the longer the cable length, the slower the dat a t r ansmission rate. All applicable data baud r at es used by the SKB switch operate over the maximum cable length when proper termination is used and the number of nodes does not exceed 31.

Pin Assignment

The signals for power and communication are connect ed via the nine-pin D-subminiature serial connector (Figure 8 and Table 4).

Figure 8: Pin As signment

Table 4: Pin Assignment

Pin Signal Description Functionality

Pin 1 RXTX+ transmit/receive data positive

side (B)

TXA. Diff e r ential input/output signal fr om the RS485 host.

Pin 2 shield signal shield This line is connected to chassis ground

at the host end and is isolated at the slave.

Pin 3 RXTX- transmit/receive data

negative side (A)

Pin 4 trigger active low trigger signal,

transistor-to-transist or logic (TTL), mult i- dropped, pulled UP at slave with 100 K

TXB. Complement of the differential input/output from t he RS485 interface.

This line is driven by the host processor (master) to indicate to the slaves that a trigger-based action is to be executed on the falling edge of this signal. This action is usually preconditioned by a request to the applicable slaves.

Pin 5 Attention active low attention signal,

open collector, pulled UP at master with 470 ohm

This line is driven by the SKB module (slave) to indicate to the master that it requires the host attent ion. This signal is an open collector signal that is terminated at the host end by a 470 ohm resistor connected to V+.

(table continued)

Operating and Maintenance Instructions – 16

Pin Signal Description Functionality

Pin 6 V+ 5 V supplies in

These lines are supplied by a 5V ±5% regulated power supply provided from the host. Each of these wires provides power for different elem ents of the

module. Pin 7 V+ 5 V supplies in Pin 8 GND power ground These lines are power supply grounds

and are isolated from the chassis

ground. Pin 9 GND power ground

RS485 Addresses

The addresses are outlined in Table 5.

Table 5: RS485 Addresses

Address Description

0 Reserved for master. Cannot be an SKB switch.

2 to 31 Valid address range for SKB devices.

255 Broadcast address. Packets sent with a broadcast address are received

and parsed by all active SKB devices on the RS485 bus.

Each SKB switch is pre-assigned an address of 1. If an SKB device is reset (either hard or sof t), and the network address is 1, the ATTN line is asserted. The ATT N line is de-asserted when the device address is changed to something other than 1. This feature acts as a mechanism for informing the bus master that a device with the default address is connected to the bus.

RS485 Protocol

A proprietary link-layer RS485 protocol has been developed that enables network-based communication utilizing a single master and multiple slaves on a common bus. The protocol provides a high-level flow control mechanism (using acknowledge packets) and link-layer error detection (using CRC packet validation). The RS485 protocol consists of two elements: the RS485 link-layer communication packet and the m ast er-slave acknowledge cycle.

The RS485 packet is composed of a number of bytes surrounding a data payload (Figure 9). T he data payload section of the RS485 packet holds exactly one standard command packet, as illustrated. The packet bytes are designated as shown in Table 6.

Operating and Maintenance Instructions – 17

Figure 9: RS485 Link-Layer Packet and Command Packet

Table 6: RS485 Link-Layer Packet Fields

Packet Byte Size (bits) Description

SOH 8 Start of header byte (0x81)

DEST 8 Destination address of the packet (0x00 reserved for master,

0xFF reserved for broadcast)

SRC 8 Source address (for sending ACK’s and responses)

TYPE 8 Packet type (DATA = 0, ACK = 1)

LEN 16 Length of payload section of the RS485 packet

CRC 16 16-bit CRC value with 0x1021 as polynomial

The master-slave acknowledge cycle refers t he process of indicating to the sender that an RS485 packet has been received intact and that more pack ets can be sent. This action is accomplished by sending an RS485 ACK packet back to the sender. Once a valid RS485 packet is received, and the CRC has been verified, another packet can be sent by the master. Theref ore, successf ul reception of the link-layer packet must be followed by an ACK response fr om the slave. I f no ACK packet is received following transmission of a data packet with a specified timeout period, the sender needs to re-transmit the data packet. An ACK packet consists of a standard RS485 packet without a length byte, any data payload bytes, or CRC bytes. The type byte is defined as an ACK (1). The ACK packet is shown in Figure 10.

This ACK cycle is reversed when response data packets are sent from the SKB slave to the master. In this case, the master is expected to acknowledge receipt of the link -layer packet by sending an ACK packet back to the slave.

A timeout period of 500 ms is used by the SKB switch for all serial data transfers. T herefore the time between subsequent bytes of a packet, or t he time between data and ACK packets (being both sent and received, is 500 ms.

Figure 10: RS485 ACK Packet

Operating and Maintenance Instructions – 18

A holdoff period of 1 m s is observed by the SKB switch when transmitting data or ACK packets back to the master. T he holdoff is a short delay to allow the master to prepare to receive dat a from the slave.

If a communication error occur s (for example, CRC mismatch), no ACK packet is transmitted to the sender.

If no ACK packet is received within a particular period f ollowing transmission of the last RS485 packet byte, retransmit t he or iginal RS485 packet.

Typical protocol is shown in Figure 11.

Operating and Maintenance Instructions – 19

Transmit DATA packet to SKB

slave.

No Yes

ACK packet

received before timeout

period expired?

Parse response packet.

Yes

Response

DATA packet required

from SKB slave?

Yes

Response

DATA packet received

before timeout period

expired?

Indicate error.

Transmit next packet.

Transmit ACK packet to the

SKB Slave.

Figure 11: RS485 Network Implementation

Operating and Maintenance Instructions – 20

Re-transmit original packet, if

desired.

Parallel Interface

A 25-pin D-subminiature connector is used f o r t he parallel interface.

Pin Assignment

The pin assignment for t he par allel interface is outlined in Figure 12 and Table 7.

Figure 12: Pin A ssignment

Table 7: Pin Assignment

Pin Signal Description

1GND1shield 2 D1 data line 1 3 D2 data line 2 4GND1shield 5 D5 data line 5 6 D6 data line 6 7GND1shield 8 BUSY busy output:

low = idle high = operation in progress (switching)

9 ERROR error output:

low = normal high = error in error queue

10 GND

shield 11 /SOP start of packet-- pr ovides a start - and- st op m echanism 12 R/W read/write--driven by master read and write cycles

13 GND

shield 14 D0 data line 0 input; least significant bit (LSB)

15 GND

shield 16 D3 data line 3 17 D4 data line 4 18 GND

shield

(table continued)

Operating and Maintenance Instructions – 21

Pin Signal Description

19 D7 data line 7; most significant bit (MSB) 20 STROBE STROBE input, active low:

high-to-low pulse = read data lines and home line

high = ignore state of data lines and home line

This line is internally pulled high via 10 k ohm resistor t o 5 V DC 21 GND

shield 22 RESERVED reserved; inte r nal use only; do not use 23 RESERVED reserved; inte r nal use only; do not use 24 GND

shield 25 RESET r esets the hardware (MCU reset)

Connect GND signal lines to common ground of the master.

Caution

If the reserved pins are used for any purpose, compat ibility with futur e versions of the SKB module can be compromised.

Using SK / SP Emulation Mode

The SKB switch can be run in a mode that emulates operation of the SK and SP product line. A hybrid, parallel connector cable must be constructed. Contact JDS Uniphase for instructions on cable pinouts.

Simultaneous operation of serial and parallel int er face is not supported.

Using the Switch

Voltage Levels

All parallel interface signals are TTL compatible. The active state of each signal is outlined in Table 8.

Operating and Maintenance Instructions – 22

Table 8: Parallel Interface States

Signal Name Active State Inactive State

D0 - D7 high low

/STROBE low high

BUSY high low

ERROR high low

/SOP low high

R/W high = read

N/A

low = wr ite

/RESET l ow high

Line Descriptions

Data Lines (D0...D7)

Byte data is composed of a binary eight-bit pat tern presented on the /D0 to /D7 data lines. Input and output byte data are presented the same way.

Data line formats are out lined in Table 9.

Table 9: Data Line Formats

/SOP D7 D6 D5 D4 D3 D2 D1 D0 Channel

Number

000000000 0 000000001 1 000000010 2 0'''''''' ' 0 1 1 1 1 1 1 1 1 255

The value 0 indicates that the input needs to be set low (f or example, <0. 8 V DC). The value 1 indicates that the input needs to be set hig h ( for example, ≥2 V DC).

/SOP Input Line

The /SOP line provides a data packet start/stop mechanism. T ransition of the /SOP line from a high-to-low state indicates the beginning of a data packet, and all subsequent bytes placed on the data lines are considered packet data bytes. Transition of t he /SOP line back from a low-to-hig h state indicates the end of a data pack et. The master is responsible for controlling the /SOP line.

/STROBE Input Line

The /STROBE line is used to signal the SKB switch to read data from or write data to t he data lines. A change on the data lines has no effect until there is a high-to-low transition on the

Operating and Maintenance Instructions – 23

/STROBE line. The /STROBE line is driven by the master for both transmit and receive operations.

R/W Input Line

The R/W line is driven by the master as a bus control mechanism . When the R/W line is driven low, /D0-/D7, /SOP, and /STROBE line transitions are interpreted as input operations from the master to the slave. When R/W is driven high, operations are interpreted as output f rom t he slave to the master.

BUSY Output Line

The BUSY line provides a flow control mechanism. The BUSY line is pulled high by the slave after each byte is transfer red. The master does not tog gle any lines until a high-to-low transition of the BUSY line is detected.

ERROR Output Line

The ERROR line is used to flag the master when the slave detects an error. W hen the error line is high, there is an error in the error queue. The ERROR line is driven low when the errors are read out of the error queue or the error queue is cleared.

/RESET

Reset resets the micro-controller unit (MCU) in the switch. All communication interfaces are r eset.

Parallel Protocol

The read and write cycles follow a mechanism that tightly coupled the control sig nals (SOP and STROBE lines on the master side and BUSY line on the slave side) to pr ovide flow control. These cycles are defined as follows.

Read Cycle

The read cycle refers to the bus master reading bytes from the SKB slave (Figure 13). In this mode, the master ensures that the R/W line is pulled high. The m aster t hen tog g les the /SO P line from the high to the low state, which signals the SKB switch to place the first data byte on the data lines. The BUSY line is held high to indicate to t he master that a valid byte has been placed on the data lines. To indicate that the master has completed the read, the /STROBE line transitioned to low. The SKB switch subsequently pulls the BUSY line low to signal that the data acknowledgment has been received. The master then sets the STROBE to high. The BUSY transitions to high to indicate to t he mast er when the next byte has been placed on the dat a lines. Upon completion of the last data byte transm ission, the master r esets the /SOP line from the low to the high state to indicate the end of the data packet.

Write Cycle

The write cycle refers to the bus mast er writing bytes to the SKB slave (Figure 14) . In this mode, the master ensures that the R/W line is pulled low. The master then t oggles the /SOP line from high to low, which indicates the beginning of a new packet. Binary byte data is subsequently placed on the data lines /D0 to /D7 and entered by use of the /STROBE line. After each STROBE, the BUSY line is held high until t he SKB switch is ready to receive the next data byte. Upon completion of the last data byte transmission, the /SOP line is toggled from low to high, indicating the end of the data packet.

Operating and Maintenance Instructions – 24

Yes

Master

Interface Idle

BUSY

Asserted?

Assert Read

Slave

Interface Idle

R/W

Yes

Assert SOP

BUSY

Asserted?

Yes

Read Data Byte

Assert Strobe

BUSY

Reset?

Yes

Reset Strobe

Packet Bytes

to read?

SOP

/STB

STB

Busy

Write Next Packet Byte to Data Bus

Assert Busy

SOP

Asserted?

Yes

Reset Busy

BUSY

Asserted?

Yes

Reset SOP

SOP

Figure 13: Flowchart of Read Cycle

Operating and Maintenance Instructions – 25

Master Slave

Interface Idle

Yes

BUSY

Asserted?

Assert Write

Assert SOP

No BUSY

Asserted?

Yes

Set packet

byte to bus

Assert Strobe

R/W

SOP

/STB

Busy

Interface Idle

Assert Busy

Read P acket Byte

Yes

BUSY

Reset?

Yes

Rese t Strobe

BUSY

Asserted?

Yes

Pack et Bytes

to send?

Reset SOP

Busy

Save Packet Byte

STB

Busy

SOP

Figure 14: Flowchart of Write Cycle

Reset Busy

Assert Busy

STROBE Asserted

Yes

Operating and Maintenance Instructions – 26

Timing

The SKB switch uses bidirectional parallel lines for the data bus (D0 to D7) and dedicated input/output lines for flow control. Dat a flow control is implem ented on a byte-by-byte basis, using the BUSY output line of the SKB switch as the primar y mechanism of controlling the dat a t ransf er rate. By using control signals, the actual signal timing can vary (within defined tolerances) according to the availability of the SKB switch, which is indicated with a low-level BUSY signal.

The primary control signals of the master are the /SOP and /STROBE lines. Transitions of the /SOP line are used to delimit the beginning and end of packets. The /STROBE line is used to signal the SKB switch to either read bytes from the data lines or write bytes to the data lines.

Timing dependencies have been minimized, allowing use of control signals to regulate communication. However, the following timing requirements must be observed:

• A hold time of 5 µs must be applied when toggling SKB input lines (for example, R/W, D0-D7, /SOP, /STROBE, /RESET).

• The maximum period between sequential bytes (indicated by transitions of the /STROBE line) is 500 ms.

The following general rules apply:

• The master needs to ensure that the BUSY line is de-asserted (low) before toggling any parallel communication lines (for example, /SOP, /STROBE, and so on).

• Communication lines must be toggled according to the steps indicated in the protocol flow charts for read and write operations. Poll the error line following each operation.

The read cycle protocol is illustrated in Figure 15. Typical line toggling f or a master read cycle is shown. The figure shows the relationship of the R/W , /SOP, and /STROBE input lines and the BUSY output line during a three-byte response packet read from the SKB switch.

Figure 15: Three-Byte Response Packet Read from the SKB Switch

Operating and Maintenance Instructions – 27

The following actions correspond to numbered events in the figure:

1. The R/W line is driven high to indicate read-from-SKB oper at ion.

2. T he /SOP line is then asserted (low) to indicate the start of a command packet.

3. The BUSY line of the SKB switch is asserted (hig h) to indicat e the f irst byte of the packet has been written to the data bus.

4. Binary data is read from the data lines (D0 t o D7) and the /STROBE line is asser ted (low) to indicate to the SKB switch that the byte was read.

5. The BUSY line is de-asserted (low) to indicate to the master that t he SKB switch is ready to send another byte.

6. The /STROBE is de-asserted (hig h) to indicate to the SKB switch that the master is ready to accept another byte.

7. T he BUSY is asserted (high) to indicate to the master t hat another byte has been written to the data bus. All subsequent bytes are processed in the same f ashion to indicate the m aster has read the data bus.

8. The /SOP line is de-asserted (high) to indicate end of packet.

9. The BUSY line is asserted (high) to indicate packet parsing and driven low when end-ofpacket processing is complete.

This write cycle protocol is illustrated in Figure 16. Partial parallel int erf ace line tog gling is shown. The figure shows the relationship of t he R/W, /SOP, /STROBE input lines, and the BUSY output line during a two-byte command packet write to t he SKB switch.

Figure 16: Four-Byte Command Packet Write to the SKB Switch

The following actions correspond to numbered events in the figure:

1. The R/W line is pulled low to indicate write- t o - SKB oper ation.

2. T he /SOP line is then asserted (low) to indicate the start of a command packet.

3. The BUSY line of the SKB switch is asserted (high) to indicat e / SO P pr ocessing.

Operating and Maintenance Instructions – 28

4. Binary data is written to the data lines (D0 to D7), and t he /STROBE line is asserted (low) to indicate to the SKB switch that the byte can be read.

5. The BUSY line transitions to the idle (low) state to indicate that the SKB switch has read the byte.

6. The STROBE line is de-asserted (high), the SKB switch then asserts (high) BUSY to complete the byte transfer. All subsequent bytes are str obed-in t o the SKB switch in t he sam e way.

7. After BUSY transitions high following the final byte, the /SOP line is de-asserted (high) to indicate end-of-packet.

Error Cycle

The timing error cycle refers to the operation of the ERROR line (Figure 17). When any error occurs on the SKB switch, a corresponding error code is written to an eight-deep error queue. Error codes can be written to the error queue as a result of operational or communication error s. When an error code is pending in the error queue, the LINE of the parallel interface is driven high. The ERROR line remains in the hig h state while there are err or codes present in t he error queue. Error queue management commands are included in the SKB standard command set. Figure 17 shows the relationship of the /SOP and /STROBE input lines and the BUSY and ERROR output lines during a three-byte packet transfer.

Figure 17: Three-Byte Packet Write Produces an Error

In the figure, the comm unication process was successful, indicating that the er ror was due to an operational aspect of the SKB switch.

The following actions correspond to events numbered in the figure:

1. The command packet is transfer red normally. In this case, t he packet tr ansfer was successful due to the fact that the f inal BUSY cycle indicates completion of packet processing. When a communication error is indicated, the ERROR line is asserted (high) before t his point.

2. The error line is asserted (high) and rem ains asser t ed until the error queue is cleared.

Operating and Maintenance Instructions – 29

ERROR asserted does not preclude more operations f rom occuring; more data packets can be received or transmitted. The err or line needs to be polled after each operation to determine the condition of the SKB switch.

Commands

Architecture Overview

Instructions and queries are received by the SKB module as command packets. Command packets describe a method of encapsulat ing a command opcode, a length code, and applicable parameter data in a format t hat can be interpreted by the command processor of t he instrument module firmware.

Command packets are the only available means of m oving dat a into and out of the SKB module. External communication drivers and protocols are utilized to transmit and receive command

packets. For example, the parallel communication driver can directly transmit com mand packets, while the serial communication driver can implement a protocol that em beds command packets within larger protocol packets.

Command Packet Format

Essentially all communication with the SKB module, regardless of int erface or protocol used, is accomplished via command packets.

A standard command packet can be up to 256 bytes in lengt h. The first byte is always an opcode, which can be any number between 0 and 127. The most

significant bit (MSB) is never set in a command packet opcode. The second byte is always the length, in bytes, of the f ollowing parameter data. T he value of the

length byte corresponds to the number of bytes in the parameter data section of the command packet, regardless of the actual data type represented by the binary parameter data.

The minimum length of a command packet is two bytes. The opcode and length (even if zero) must be transmitted to the SKB m odule.

Command packets appear as follows:

OP LEN DATA

where OP = opcode and LEN = length. The communication architecture of the SKB switch does not implement a command-response

scheme. Each command packet sent is not necessar ily answered with a response packet. Only those opcodes that represent a query generat e a response packet.

Operating and Maintenance Instructions – 30

Response Packet Format

Response packets refer to packets transmitted by the SKB switch for t he purposes of returning query data. Response packets have an identical for mat as a st andard command packet, with the MSB of the opcode byte set.

If, for example, an opcode of 0x01h was sent to the SKB switch and this opcode repr esented a query, the response packet has an opcode of 0x81h.

The length byte of a response packet represents the tot al length of the param eter response data, regardless of the actual data types embedded in the parameter area.

Parameter Data Types

Parameter data of the command packet is limited to 254 bytes, which can be allocated at the discretion of the application according to standard data types shown in Table 10.

Table 10: Parameter Data Types

Data Type Size in Bytes (Bits)

signed char 1 (8) unsigned char 1 (8) signed int 2 (16) unsigned int 2 (16) signed long 4 (32) unsigned long 4 (32) float 4 (32)

Byte Order

When utilizing data types larger t han one byte, the byte order follows “litt le-endian” convention: the low-order byte (which holds the least significant bit, or LSB) is referenced as byte 0. Subsequent bytes progress toward the high- order byte (which holds the MSB). This sequence is illustrated as follows.

Single-byte bit order:

Bit 76543210

Double-byte bit order:

Bit 1514131211109876543210

Byte 0 (low) Byte 1 (high)

Operating and Maintenance Instructions – 31

Quadruple-byte bit order:

Bit 31302928272625242322212019181716

Byte 0 (low) Byte 1

Bit 1514131211109876543210

Byte 2 Byte 3 (high)

Example: The 16-bit number represented by 0x1234h is split into two bytes as follows: 0x34h (Byte 0) and

0x12h (Byte 1). In the command or response packet, however, these bytes are contiguous and therefore appear as 0x3412h.

Common Commands

SKB common commands refer to t hose operations and queries com mon to m ost switch modules and instruments. These commands repr esent the core functionality of the instrum ent module.

RESET

Description Reset all switches to the default state.

This command is functionally the same as a hardware Reset. The following major events occur:

• Current settings (channel positions are saved)

• A hardware reset is generated by the microcontroller

• On wakeup, non-latching switches move to the Reset position (factory

default is a null-connect channel, but this can have been changed by the user), and latching switches stay on the same channel

Also see the SWI TCH command, which can be used to send individual

switches to the reset position. Parameters NA Parameter

NA Description

OPCODE Length Parameters

0x00 0x00

Operating and Maintenance Instructions – 32

IDN?

Description Query identification information Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x01 0x00

Response packet

OPCODE Length Parameters

0x81 0x22 U8 Serial_Num [15], U8 Model_Num[15], Core_Ver[2], App_Ver [ 2]

Serial_Num (unsigned eight-bit array of 15 elements)--An array of 15 eight-bit integers ( 0 to 255) representing the serial number of the device. Unused bytes are zero-padded.

Model_Num (unsigned eight-bit array of 15 elements)--An array of 15 eight-bit integers ( 0 to 255) representing the model number of the device. Unused bytes are zero-padded.

Core_Ver (unsigned eight-bit ar r ay of two elements)--A pair of two eight-bit integers (0 to 255) representing the core firmware version. The first element corr esponds t o the major version and the second to the minor version (for example, 1. 10) . Unused bytes ar e zeropadded.

App_Ver (unsigned eight-bit ar r ay of two elements)--A pair of two eight-bit integers ( 0 t o 255) representing the application fir m ware version. The first element cor r esponds to the major version and the second to the minor version (for example, 1.10) . Unused bytes are zero-padded.

The numeric values of the bytes representing the serial, model, and version numbers are ASCII codes of equivalent char act er bytes. Therefore, U8 data can be dir ect ly tr anslat ed into ASCII character data for display to the user.

Operating and Maintenance Instructions – 33

STATUS?

Description Query the status register value Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x02 0x00

Response packet

OPCODE Length Parameters

0x82 0x01 U8 Status_reg

Status_reg (unsigned eight-bit)--Current binary value of the Module Status Register (MSR), as indicated in the following table.

Bit 76 5 43210 Function ERR EQO ALRM OPP R/W RR R RRRRR Initial value 0 0 0 0 0 0 0 0

ERR (ERROR, bit 7)--This bit indicates that an error code has been written to the error queue. It is cleared when the error queue is cleared.

EQO (ERROR QUEUE OVERFLOW , bit 6)--This bit indicates that more than eight errors have occurred and the error queue has overflowed. It is cleared when the error queue is read at least once and can hold another error code.

ALRM (ALARM, bit 5)--This bit indicates that a bit in the alarm register is set. It is cleared when the alarm register is cleared.

OPP (OPERATION IN PROGRESS, bit 4)--This bit indicates that a critical operation is in process. It is cleared when the operation is complete.

Operating and Maintenance Instructions – 34

ALARM?

Description Query the alarm regist er value Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x03 0x00

Response packet

OPCODE Length Parameters

0x83 0x02 U16 Alarm _ r eg

Alarm_reg (unsigned 16-bit ) --Current binary value of the Alarm Register (AR), as indicated in the following table

Bit 15 1413 12 1110987654321 0 Function EPV OT UT CFO R/W R R R R R R RRRRRRRRR R Initial value 0 0 0 0 0 0 000000000 0

EPV (EEPROM VERIFY FAIL, bit 15)--This bit indicates that the verify operation of an EEPROM write failed. It is cleared when the AR is read.

OT (OVER TEMPERATURE, bit 14)--This bit indicates that am bient temperature of the module has exceeded the high temperature threshold f or a period of at least 10 seconds. I t is cleared when the temperature falls below the high tem per at ure threshold.

UT (UNDER TEMPERATURE, bit 13)--This bit indicates that am bient temperature of the module has dropped below the low temperature threshold for a period of at least 10 seconds. It is clear ed when the temperature falls below the high tem per at ure threshold.

CFO (CONFIGURATION OVERFLOW, bit 12)--This bit indicates that user configuration commands have been executed more than 50,000 times. This bit is not cleared when the configuration command counter exceeds 50,000. This bit can only be cleared at the JDS Uniphase factory.

Operating and Maintenance Instructions – 35

LERROR?

Description Read and clear last error message in the error queue Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x04 0x00

Response packet

OPCODE Length Parameters

0x84 0x01 U8 Err or_code

Error_Code (unsigned eight-bit)--Error code represents the last error that occurred, as indicated in the f ollowing t able

Error Code Description

0 ( 0x00 ) No err or--OK 1 ( 0x01 ) I nvalid comm and opcode 2 ( 0x02 ) Comm and packet length mismatch 3 ( 0x03 ) I nvalid pack et length 4 ( 0x04 ) I nvalid comm and packet parameter 5 ( 0x05 ) EEPROM write failure 6 ( 0x06 ) Switch 1 failure 7 ( 0x07 ) Switch 2 failure 8 ( 0x08 ) Switch 3 failure 9 ( 0x09 ) Switch 4 failure 10 ( 0x0A ) Invalid spare channel 11 ( 0x0B ) Communication interface receive time-out 12 ( 0x0C ) Communication interface transmit time-out 13 ( 0x0D ) Communication pack e t invalid 14 ( 0x0E ) Communication receive run-on condition 15 ( 0x0F ) Communication transmit run-on condition 16 ( 0x10 ) Communication invalid transmit operation initiated by mast er

(table continued)

Operating and Maintenance Instructions – 36

Error Code Description

17 ( 0x11 ) Communication transmit attempt s exceed limit - - t ransmit operation aborted 18 ( 0x12 ) Communication invalid STROBE received 19 ( 0x13) RS485 link-layer packet CRC mismatch 20 ( 0x14) RS485 invalid link-layer packet length 21 (0x15) RS485 invalid link-layer packet type 22 (0x16) RS485 invalid source address 23 (0x17) RS485 link-layer packet ACK transmit tim eout 24 (0x18) RS485 link-layer packet ACK receive timeout 25 (0x19) RS485 link-layer ACK expected but DATA packet received 26 (0x1A) RS485 unexpected ACK packet r eceived 27 (0x1B) UART overrun (bytes m issed in ser ial r eceive) 28 (0x1C) Undefined error

EQCLEAR

Description Erase all entries in the error queue Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x05 0x00

TEMP?

Description Query temperature information Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x06 0x00

Operating and Maintenance Instructions – 37

Response packet

OPCODE Length Parameters

0x86 0x06 U16 Hi_temp, U16 Low_temp, U16 Temp

Hi_temp (unsigned 16-bit)--Configured high temperature threshold (234 – 353 °K)

Low_temp (unsigned 16-bit)--Configured low temperature threshold (233 – 352 °K)

Temp (unsigned 16-bit)-- Act ual ambient temperature (233 – 353 °K) Temperature (°C) = T em per at ure (°K) - 273 All temperature information is referenced in degrees Kelvin.

Conversions are as follows: 1 °C = 1 °K and 0 °C = 273 °K approximately 1 °F = 0.55 °K and 0 °F = 255.37 °K

STIMER?

Description Query the system timer. System t ime is defined from the last reset ( includes

power cycle and hard or soft reset). Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x0B 0x00

Operating and Maintenance Instructions – 38

Response packet

OPCODE Length Parameters

0x0B 0x07 U16 Msec, U8 Sec, U8 Min, U16 Hour, U8 Year

Msec (unsigned 16-bit)--The current millisecond timer index (0 to

999). Sec (unsigned eight-bit)--The current second timer index (0 to 59). Min (unsigned eight-bit)--The cur rent minute timer index (0 to 59). Hour (unsigned 16-bit)--T he current hour timer index (0 to 8759). Year (unsigned eight-bit) - - The current year timer index (0 to 255). The system timer is returned as seven bytes as described

previously. These bytes can be extracted into a “C” structure, for example, as follows:

struct TIMER /* define system timer struct */ { U16_t Msec; /* milliseconds */ U8_t Sec ; /* seconds */ U8_t Min ; /* minutes */ U16_t Hour; /* hours */ U8_t Year; /* years (approx. 8760 hours) */ };

RESET_STIMER

Description Reset the system timer to 0 Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x0C 0x00

Operating and Maintenance Instructions – 39

SWITCH

Description Modify logical switch state Parameters Switch, Input, Output Parameter

Description

Switch (unsigned eight-bit)--switch number

Input (unsigned eight bit) - - input channel

Output (unsigned eight bit ) --output channel

Command packet

OPCODE Length Parameters

0x20 0x03 U8 Switch, U8 Input, U8 Output

Switch (unsigned eight-bit)-- Logical switch number upon which to perform action (f or example, 1 t o 4)

Input (unsigned eight-bit ) - - Input channel to connect (for example, 1 on a 1xN switch)

Output (unsigned eight- bit )--Output channel to connect specified input channel, where

0 = reset position (factory conf igured to be a null connect, but this can have been changed by user) 1 to 200 = output channel number 254 = previous channel; ignored if the switch is on the f irs t channel 255 = next channel; ignored if the switch is on the last channel

SWITCH?

Description Query logical switch state Parameters Switch, Input Parameter

Description

Switch (unsigned eight-bit)--switch number

Input (unsigned eight-bit ) - -input channel number

Command packet

OPCODE Length Parameters

0x21 0x02 U8 Switch, U8 Input

Switch (unsigned eight-bit)-- Logical switch number upon which to read information (for example, 1 to 4)

Input (unsigned eight-bit ) - - Input channel to find connection of

Operating and Maintenance Instructions – 40

Response packet

OPCODE Length Parameters

0xA1 0x01 U8 Output

Output (unsigned eight- bit ) --The output channel connected to the input channel specified

NUM_SWITCH?

Description Query number of log ical switches Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x22 0x00

Response packet

OPCODE Length Parameters

0xA2 0x01 U8 Switches

Switches (unsigned eight-bit)-- The number of logical switches in the module (for example, 1 to 4)

LEARN?

Description Query command(s) req uir ed to return the switch to current state following

reset. This query returns t he information required to send the switch back to

the state it was in prior to reset. Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x24 0x00

Operating and Maintenance Instructions – 41

Response packet

OPCODE Length Parameters

0xA4 0x04 to

0x0F

(1-4) * (U8 Opcode, U8 Sw_Id, U8 Cur_In, U8 Cur _Out)

Opcode (unsigned eight-bit) - -“SWIT CH” command opcode (0x20) Sw_Id (unsigned eight-bit)-- Switch number ( 1 to 4) Cur_In (unsigned eight-bit )--Current input channel of the switch (1 to

2) Cur_Out (unsigned eight- bit)--Current output channel of t he switch

(0 to 200)

The length is variable, depending on the number of switches in the module.

TST?

Description Perform a self-test operation and return r esult s Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x25 0x00

Response packet

OPCODE Length Parameters

0xA5 0x01 to

0x04

U8 Sw1_Result, U8 Sw2_Result, U8 Sw3_Result, U8 Sw4_Result,

Sw1_Result (unsigned eight-bit)--Self-test result (0/1, where 0 = pass and 1 = fail)

Sw2_Result (unsigned eight-bit)--Self-test result (0/1, where 0 = pass and 1 = fail) (if necessary)

Sw3_Result (unsigned eight-bit)--Self-test result (0/1, where 0 = pass and 1 = fail) (if necessary)

Sw4_Result (unsigned eight-bit)--Self-test result (0/1, where 0 = pass and 1 = fail) (if necessary )

The length is variable, depending on the number of switches in the module.

Operating and Maintenance Instructions – 42

SAVE

Description Save the current state of all switches at one of 10 locations Parameters Location Parameter

Location (unsigned eight-bit) - - Memory location to save stat e Description

Command packet

OPCODE Length Parameters

0x26 0x01 U8 Location

Location (unsigned eight-bit) - - Memory location of state data (0 to 9)

RECALL

Description Recall a module state previously saved Parameters Location Parameter

Location (unsigned eight bit)- - memory location Description

Command packet

OPCODE Length Parameters

0x27 0x01 U8 Location

Location (unsigned eight-bit) - - Memory location of state data (0 to 9)

Configuration Commands

SKB configuration commands are operations and queries that allow users to modify basic instrument settings.

CONFIG?

Description Query the config ur ation of all logical switches Parameters NA Parameter

Description

Command packet

OPCODE Length Parameters

0x23 0x00

Operating and Maintenance Instructions – 43

Response packet

OPCODE Length Parameters

0xA3 0x04 to

0x0F

(1-4) * (U8 Sw_Id, U8 Sw_Type, U8 Max_In, U8 Max_Out)

Sw_Id (unsigned eight-bit)-- Logical switch identification number (1 to

4) Sw_Type (unsigned eight-bit)--Physical switch type (0:motor or

1:relay) Max_In (unsigned eight-bit)--Maximum number of inputs of the

switch (1 to 2) Max_Out (unsigned eight-bit)--Maximum number of outputs of the

switch (1 to 200)

The length is variable, depending on the number of switches in the module.

HITEMP

Description Set the upper temperat ure threshold Parameters Temp Parameter

Description

Temp (unsigned 16-bit)--The °K high temperature thr eshold t hat, if exceeded,

causes the OT alarm register bit to be set

Command packet

OPCODE Length Parameters

0x07 0x02 U16 Hi_temp

Hi_temp (unsigned 16-bit)-- High temperature threshold (234 to 353 °K)

All temperature information is referenced in degrees Kelvin. Conversions are as follows: 1 °C = 1 °K and 0 °C = 273 °K approximately 1 °F = 0.55 °K and 0 °F = 255.37 °K

LOWTEMP

Description Set the lower temperature threshold Parameters Temp Parameter

Description

Temp (unsigned eight- bit ) --The °K low temperature threshold that, if

exceeded, causes the UT alarm register bit t o be set

Operating and Maintenance Instructions – 44

Command packet

OPCODE Length Parameters

0x08 0x02 U16 Low_temp

Low_temp (unsigned 16-bit)--Low temperatur e threshold (233 to 352 °K)

SPARES?

Description Query the current number of spare fibers available on the logical switch

specified Parameters Switch Parameter

Switch (unsigned eight-bit)--logical switch Description

Command packet

OPCODE Length Parameters

0x30 0x01 U8 Switch

Switch (unsigned eight-bit)-- Logical switch number (1 to 4)

Response packet

OPCODE Length Parameters

0xB0 0x01 U8 Spares

Spares (unsigned eight-bit)--The number of spare channels currently configured f or the switch

REPLACE

Description Replace output channel with factory spare Parameters Switch, Output, Spare Parameter

Description

Switch (unsigned eight-bit)--switch number

Output (unsigned eight- bit )--channel number to be replaced

Spare (unsigned eight-bit)--factory spare number

Operating and Maintenance Instructions – 45

Command packet

OPCODE Length Parameters

0x33 0x3 U8 Switch, U8 Output, U8 Spar e

Switch (unsigned eight-bit)-- Logical switch number (1 to 4) Output (unsigned eight- bit )--The replaced output channel (1 to 200) Spare (unsigned eight-bit)- -The factory spare number used f or t he

replacement (1 to 200) This command resets the switch.

SWAP_CHANNEL

Description Swap channel designations between two optical fibers. This com m and can be

used to reorder channels when the channels have been spliced into the

system incorrectly. The factory-configured order also can be recalled. Parameters Switch, Output1, Output2 Parameter

Description

Switch (unsigned eight-bit)--switch number

Output1 (unsigned eight- bit )--first output channel

Output2 (unsigned eight- bit ) --second output channel

Command packet

OPCODE Length Parameters

0x34 0x03 U8 Switch, U8 Output1, U8 Output2

Switch (unsigned eight-bit)-- Logical switch number (1 to 4) Output1 (unsigned eight- bit )--The first output channel ( 1 t o 200) Output2 (unsigned eight- bit ) --The second output channel (1 to 200) This command resets the switch.

LATCHING?

Description Query latching status of the switch Parameters Switch Parameter

Switch (unsigned eight-bit)--switch number Description

Operating and Maintenance Instructions – 46

Command packet

OPCODE Length Parameters

0x35 0x01 U8 Switch

Switch (unsigned eight-bit)-- Logical switch number (1 to 4)

Response packet

OPCODE Length Parameters

0xB3 0x01 U8 Latching_Status

Latching_Status (unsigned eight-bit)--The status of the switch (latching or not: 1/0 respectively)

RESET_CHANNEL?

Description Query output channel associated with the reset position for the selected switch Parameters Switch Parameter

Switch (unsigned eight-bit)--switch number Description

Command packet

OPCODE Length Parameters

0x36 0x01 U8 Switch

Switch (unsigned eight-bit)-- Logical switch number (1 to 4)

Response packet

OPCODE Length Parameters

0xB6 0x01 U8 Output_Channel

Output_Channel (unsigned eight- bit)--The output channel associated with the reset position (0 to 200)

RESET_CHANNEL

Description Define the reset output channel Parameters Reset_Channel Parameter

Description

Reset_Channel (unsigned eight-bit) - - Output channel number to be associated

with the reset channel

Operating and Maintenance Instructions – 47

Command packet

OPCODE Length Parameters

0x37 0x02 U8 Switch, U8 Reset_Channel

Reset_Channel (unsigned eight-bit)--The output channel to be associated with the reset position (0 to 200)

The reset channel is defined in ref e r ence t o input port 1. This command resets the switch.

RECALL_FAC_SETTING

Description Recall the original f actory setting of the switch Parameters Switch Parameter

Switch (unsigned eight-bit)--switch number Description

Command packet

OPCODE Length Parameters

0x38 0x01 U8 Switch

Switch (unsigned eight-bit)-- Logical switch number (1 to 4) This command resets the switch. The setting is modified with the

MODIFY_SPEED, RESET_CHANNEL, REPLACE, and SWAP_CHANNEL commands. Commands are reset to fact or y defaults.

SPEED?

Description Query the speed of the switch Parameters Switch Parameter

Switch (unsigned eight-bit)--switch number Description

Command packet

OPCODE Length Parameters

0x39 0x01 U8 Switch

Switch (unsigned eight-bit)-- Logical switch number (1 to 4)

Operating and Maintenance Instructions – 48

Response packet

OPCODE Length Parameters

0xB9 0x01 U8 Speed

Speed (unsigned eight-bit)--The speed setting of the switch (1 to 5) 1 is the slowest speed with the highest repeatability.

Only speeds 1 and 2 are implemented at this time.

MODIFY_SPEED

Description Modify the speed setting of t he specified switch Parameters Switch, Speed Parameter

Description

Switch (unsigned eight-bit)--switch number

Speed (unsigned eight-bit)- - speed set ting for specified switch

Command packet

OPCODE Length Parameters

0x3A 0x02 U8 Switch, U8 Speed

Switch (unsigned eight-bit)-- Logical switch number (1 to 4) Speed (unsigned eight-bit)--The speed setting of the switch (1 to 5) 1 is the slowest speed with the highest repeatability.

Only speeds 1 and 2 are implemented at this time.

CONNECTION_TIME?

Description Query the time to connect two channels, in ms. This test breaks the current

connection.

The SKB switch allows the user to confirm the specified time to switch

between channels. The CONNECTION_TIME? query physically checks the

time by switching between the start and destination channel and outputs the

results from the inter nal clock. Parameters U8 Switch, U8 Start, U8 Destination Parameter

Description

Switch (unsigned eight-bit)--switch number

Start (unsigned eight- bit )--output channel to begin measurement

Destination (unsigned eight-bit ) - -destination output channel

Operating and Maintenance Instructions – 49

Command packet

OPCODE Length Parameters

0x3B 0x03 U8 Switch, U8 Start, U8 Destination

Switch (unsigned eight-bit)-- Logical switch number (1 to 4) Start (unsigned eight bit ) --The output channel of the specified switch

where measurement begins Destination (unsigned eight-bit)--The destination output channel on

the specified switch

Response packet

OPCODE Length Parameters

0xBB 0x02 U16 Interval

Interval (unsigned 16-bit)--In ms

SET_DEVICE_ADDRESS

Description Modify the RS485 network address of t he switch Parameters Address Parameter

Address (unsigned eight-bit)--device address Description

Command packet

OPCODE Length Parameters

0x3D 0x01 U8 Address

Address (unsigned eight-bit)- -Network address (2 to 31)

DEVICE_ADDRESS?

Description Query the RS485 network address of the device Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x3E 0x00

Operating and Maintenance Instructions – 50

Response packet

OPCODE Length Parameters

0xBE 0x01 U8 Address

Address (unsigned eight-bit)- -Network address (2 to 31)

SET_TRIGGER_CMD

Description Set the trigger command Parameters Opcode, Param1, Param2, Param3 Parameter

Description

Opcode (unsigned eight-bit)--opcode of command to be executed

Param1, Param2, Param3 ( unsigned eight-bits)--first, second, and third

parameter of the selected comm and ( number of parameters ranges from 0 to

3 depending of the selected command)

Command packet

OPCODE Length Parameters

0x3F 0x01 to

0x04

U8 Opcode, U8 Param1, U8 Param2, U8 Par am3

Opcode (unsigned eight-bit)--Opcode of the command selected to be executed as part of the trigger command (0x20 to 0x27)

Param1 (unsigned eight-bit ) - - Parameter 1 (if necessary) (0 to 9) Param2 (unsigned eight-bit ) - - Parameter 2 (if necessary) (1 to 2) Param3 (unsigned eight-bit ) - - Parameter 3 (if necessary) (1 to 200)

The length is variable, depending on the selected command.

TRIGGER_CMD?

Description Query the trigg er command Parameters NA Parameter

NA Description

Command packet

OPCODE Length Parameters

0x40 0x00

Operating and Maintenance Instructions – 51

Response packet

OPCODE Length Parameters

0xC0 0x01 to

0x04

U8 Opcode, U8 Param1, U8 Param2, U8 Par am3

Opcode (unsigned eight-bit)-- Opcode of the command selected to be executed as part of the trigger command (0x20 to 0x27)

The length is variable, depending on the selected command.

Operating and Maintenance Instructions – 52

Controlling the Switch using a Printer Port

The switch can be controlled with an enhanced parallel port (EPP) of a per sonal com puter.

Setting the Computer to EPP Mode

In order to interface with the SKB switch via the computer parallel port, it is necessary t o make the data lines bidirectional. This action is accomplished by using a parallel port that is conf igured to be operating in EPP mode.

To set the PC to EPP mode:

1. Use the PC operating manual and configure the parallel port for EPP, entering into the computers BIOS mode/setup and changing (or confirming) the por t .

Using the Printer Port

To use the printer port with the switch:

1. Const r uct a cable wired as outlined in Table 11.

Table 11: Cable Wiring for Printer Port Use

Printer

Signal

Name

Line Feed (37A) 1

(Hex Address)

Bit Number

PC Connector Pin SKB Pin SKB Signal

Name

14 20

/STROBE

Data 0 (378) 0 2 14 D0 Data 1 (378) 1 3 2 D1 Data 2 (378) 2 4 3 D2 Data 3 (378) 3 5 16 D3 Data 4 (378) 4 6 17 D4 Data 5 (378) 5 7 5 D5 Data 6 (378) 6 8 6 D6 Data 7 (378) 7 9 19 D7 PE (37B) 5 12 8 BUSY STROBE (37A) 0

112R/W SLCT (37B) 4 13 9 ERROR SLIN (37A) 3 INIT (37A) 2

17 22 /HOME 16 11 /SOP

(table continued)

Operating and Maintenance Instructions – 53

Printer

Signal

Name

Printer Port Ground

(Hex Address)

Bit Number

PC Connector Pin SKB Pin SKB Signal

Name

18, 19, 20, 21, 22,

23, 24, 25

1, 4, 7, 10, 13,

15, 18, 21, 24

Shield

Power Source

Power Ground

Ground

Invert the signals on these lines.

Connect these lines with the shield lines wrapped around the signal lines.

2. Connect the cable between the printer port and the parallel interface connector of the SKB switch.

3. Connect a 5 V power source t o t he ser ial power connector of the SKB switch.

Operating and Maintenance Instructions – 54

JDS Uniphase SKB SERIES User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual