Rane RPM 22 User Manual

Page 8

Manual-6

RW 485 Port
The RW 485 port uses a simple, proprietary protocol to commu-

nicate with Rane’s optional Smart Remotes (SR 2, SR 3, SR 4).

The details of this protocol are found in their manuals, available

from Rane’s web site (on each product page).

This port follows the electrical specification found in the

TIA/EIA-485 standard, with one exception: the recommended

termination impedance is neither implemented nor required,

since RW 485 uses a relatively slow baud rate (38,400 bps). In

fact, including the termination has proven to hinder the perfor-

mance of the RW 485 bus.

Five connection terminals are provided: a balanced pair of

data lines (A and B), a pair of power lines (±V), and a chassis

ground. All terminals should be connected to the corresponding

terminals of the Smart Remotes.

Up to eight Smart Remotes, each with a unique address, can

be connected to the RPM 22. Use any mix of SR 2, SR 3 and

SR 4 remotes with any combination of star or daisy chain wiring.

The cable length limitations and the maximum number of

remotes that can be powered from the RPM 22 is limited by the

mix of remote types used, cable type used, distance to each Re-

mote, and the wiring configuration. Detailed wiring and cabling

tables and several examples are discussed in the SR Manuals.

The RW 485 port is intended for Rane’s Smart Remotes only;

we do not recommend directly interfacing the RW 485 port with

devices that are not compliant with the TIA/EIA-485 standard,

such as the “485” ports found on AMX and Crestron devices.

AMX and Crestron Control
There are two ways to control a RPM unit from an AMX or

Crestron system. Use either Ethernet or use the rear panel Versa-

tile Input Port (VIP). Each of the eight VIP pins supports either

switch closure Preset recall or zero-to-five volt control of Level.

The RW 485 ports found on some Drag Net devices do not

communicate with AMX or Crestron systems. They are solely for

communicating with Rane's RW 485 remotes.

Many AMX/Crestron applications require simple Level con-

trol and/or Preset recall. This is most easily accomplished using

the VIP (Versatile Input Port) found on all RPM units.

VIP Preset Recall

Connect a switch closure or relay to a VIP pin and short it to

the ground (GND) pin to recall the corresponding Preset. For

example, shorting VIP pin 1 to the GND terminal recalls Preset

1; pin 2 recalls Preset 2, etc. There are more details about this

functionality in the Drag Net Help file and on our Drag Net Ap-

plications page. Be certain to appropriately set the VIP Alloca-

tion in Drag Net's Parameter Window.

If GND contention of two or more pins simultaneously

occurs, the highest-numbered VIP pin takes precedence. For

example, if pin 3 is shorted to GND and pin 6 is then shorted

to GND, Preset 6 is recalled. If pin 3 is closed and then pin 2,

nothing happens -- Preset 2 is not recalled. This permits a hier-

archy of Presets when using VIP pin closures for tiered priority

paging. Since there are only eight VIP pins, you can only recall

up to eight Presets using switch closures.

There are four ways to recall more than eight presets.

1. Use the Drag Net software Recall button which is only in-

tended for the system installer/designer.

2. Use the Rane SR 4 remote to recall any eight Presets.

3. Use a Rane SR 3 remote which can recall any 16 of the avail-

able 24 Presets.

4. Use an Ethernet command from an AMX or Crestron Ether-

net-equipped product.

When using Drag Net's Auto Mixer/Ducker block, you have

the ability to link a VIP pin closure to a push-to-talk switch in a

paging or boardroom application. When using the Ducker block

in these applications, the VIP pins act independently provided

you Group the appropriate VIP pin with the Auto Mixer/Duck-

er's Input in Drag Net's Remote Map. Again, see our Drag Net

Applications for examples.

VIP Level control

Connect a zero to five volt DC voltage to a VIP pin from an

AMX or Crestron card to adjust any or all Level blocks placed in

the Processing Map. Use Groups in Drag Net's Remote Map to

link one or more Level blocks so they track each other when us-

ing a VIP pin. Be certain to appropriately set the VIP Allocation

in Drag Net's Parameter Window. When using VIP pins with

Level blocks, set the minimum and maximum for each Level

block by double-clicking it while it's in a Remote Map Group.

This keeps the max and min burdens within the Drag Net device

— but only when using the VIP pin to control Levels, not when

adjusting Levels from Ethernet commands.

You can use up to eight voltage control inputs linked to

Level(s) using the rear panel VIP pins. Combinations of Preset

switches & voltage Level “pots” are possible as long as combined,

they do not exceed the eight pins provided.

Since you can Group any or all Level blocks in Drag Net's

Remote Map, it's much easier to implement a stereo level control

since the Drag Net device is burdened with the task of tracking

many Levels. You can use this to your advantage when using VIP

pins to adjust multiple zones or levels. Since you can place the

Level block anywhere within the Drag Net Processing Map, you

can Group Level blocks at the input, at the output or anywhere

in-between — just place the Level block where you want it.

Ethernet control

Download the AMX or Crestron control code and documenta-

tion from the Drag Net web page: www.rane.com/dragnet

Ethernet Port
The Ethernet port is used to configure, monitor, and control

the RPM 22 via standard 10Base-T Ethernet communication.

Use an Ethernet crossover cable (one is included with each unit)

to connect the RPM 22 directly to a computer. Use a standard

(non-crossover) Ethernet cable if the RPM 22 and computer are

connected indirectly using an Ethernet repeater hub or switch.

All devices connected to the Ethernet port, including

repeater hubs, switches, and the computer’s Network Interface

Card (NIC) must support 10Base-T communication.

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