Pelco C579M, C1501M, C1503M Section Appendices, Appendix I Communication and Connection Tutorial

SECTION 5		APPENDICES
APPENDIX I	COMMUNICATION AND CONNECTION TUTORIAL	5-1
APPENDIX II	REMOTE KEYPAD CONNECTION	5-2
APPENDIX III	KEYPAD DEFINITIONS AND TEMPLATES	5-5
APPENDIX IV	MODELS AND ASSOCIATED EQUIPMENT	5-7
APPENDIX V	DEFAULT RESET ASSIGNMENT	5-7
APPENDIX VI	CONNECTOR PINOUT LISTINGS FOR ALL CONNECTORS	5-9

APPENDIX I – COMMUNICATION AND CONNECTION TUTORIAL

There is only one, really basic set of rules that you must consider when wiring two 9760 communication devices together. Those rules are given in item 3 below.

Frustration arises only if the information you are given does not enable you to identify those elements of the connection you need to know or if the information you need is not readily at hand.

You should not be satisfied to just plug in a cable “type” because you are told to without having the slightest idea what to do if it doesn’t work. It’s easy enough to check the parameters for your- self so that when you do plug that cable in, you expect it to work. In fact, you should be surprised if it doesn’t work.

You will never get in trouble when wiring two 9760 communica- tion devices together, if you know and follow the information contained in the following points. You may not always need all the information in all the points, but you must always have enough information at your disposal to follow the connection rules stated in 3.

1.You should always know or be given the location of Pin 1 on each of the devices input/output, plugs/connectors that you intend to wire together.

2.You should always be given the signal function that can be accessed at the Pin 1 location.

3.All communication devices in the 9760 System must be wired so that the result, if checked against the following table, is true.

Device A ➞	Device B
TX +	RX +
TX –	RX –
RX +	TX +
RX –	TX –

would physically be connected to pin 1 on device 2. Straight cable is used in devices where the signal pin run on the first device is opposite that of the second device.

If a cable is “reverse”, then pin 1 on one end of the cable goes to pin 8 at the opposite end of the cable. If the connecting plugs on this cable interfaced separate devices, then pin 1 on device 1 would physically be connected to pin 8 on device 2. Reverse cable is used in devices where the signal pin run on the first device is the same as that of the second device.

The physical wiring differences for “straight” versus “flipped” come about because of the relationship of the physical orientation of the attached plugs when the cable is created.

Almost all pieces of equipment connected to the CM9760-CC1 utilize “flipped” cables because there is a concerted effort to make the signal available at Pin 1 on all devices to be TX+. Thus, use of a “flipped” cable fulfills the requirement of Point 3, that TX+ (CC1) ends up at RX+ (Pin 8) on the connected device, because the signal run from Pin 1 to Pin 8 on each device is the same. Since some devices predate this effort or are simply wired differ- ently, then either a straight cable or a non-standard wiring inter- face is used.

How to identify a “straight” cable apart from a “flipped” one is illustrated in Figure 5-1.

Figure 5-1

Identifying Cables

Compared “Color Run” is in Opposite Direction

Given 1 and 2 and knowing 3, you can successfully connect any two communication devices together to make them work. In many cases, a cable is provided. That’s OK. Just check it before you use it.

Depending on the physical geometry of the cable itself, you may also need to know how to determine cable “type” before you can apply the rules above. Most devices in the 9760 family use RJ- 45, 8-wire, flat cable to connect to each other.

This is rigid cable so, in effect, it has a cable “color” run across its width. This fact is used to determine the cable type as either “straight” (parallel) or “reverse” (flipped).

If a cable is “straight”, then pin 1 at one end of the cable goes to pin 1 at the opposite end of the cable. If the connecting plugs on this cable interfaced separate devices, then pin 1 on device 1

Compared “Color Run” is in Same Direction

To identify a cable type, physically orient the RJ-45 cable as depicted in the illustrations. Orient the cable side-by-side, tab side down. Use the “color-run” of the wire to determine cable type and use the cable type appropriate to the situation.

APPENDICES CM9760-SAT 5-1