Kramer RC-21TB User Manual

The Kramer RC-21TB 2-Button Contact Closure Switch

Congratulations on purchasing your Kramer RC-21TB single slot wall plate insert 2-Button
Contact Closure Switch which is ideal for using as a means of remote control in boardrooms

and conference rooms. It can be used with the VP−81SID step−in switcher or any other
Kramer product with contact closure control.

The RC-21TB front panel has two momentary switching buttons. On the rear are remote
momentary contact closure terminal block connectors that connect to a remote switch terminal
block connector. When the button is pressed it lights and the switch is made.

Figure 1 shows the RC-21TB front panel and the pinout on the rear:

Figure 1: RC-21TB Front Panel and Rear

To install the front panel button labels:

1. Unscrew the two spacers, remove the washers on the rear side of the insert and push
out the two studs holding the front panel, see Figure 2.

Figure 2: Removing the Front Panel

2. Separate the PC board from the front panel.

3. Remove the required labels from the supplied button label sheet.

4. Hold the button cap so that it is oriented as shown in Figure 3, with the “wings” at the top
and lower sides.

Figure 3: Button Orientation

5. Insert the label (properly oriented) inside the cap.

6. Retaining the orientation, place the button cap with the label over the buttons, see

Figure 4.

Figure 4: Placing the Button Cap

7. Place the front plate over the buttons.

8. Reassemble the PC board

Note: Center the buttons in the opening before tightening the studs to prevent the buttons

from sticking during reassembly.

9. Insert the studs through the front panel. On the rear side of the insert place the washers
and then the spacers and tighten.

The RC-21TB can remotely switch the inputs of a machine via its remote contact closure
terminal blocks.

In the example illustrated in Figure 5 two SID-H HDMI Step In Commander units are
connected to RC-21TB.

Figure 5: RC-21TB connected to two SID-H Units

ON

To connect the RC-21TB, as illustrated in the example in Figure 5 and Figure 6:

1. Connect the remote terminal block connectors on each SID-H machine to the A and B
terminal block connectors of the RC-21TB.

2. Mount the RC-21TB in a single slot of a wall plate frame or a TBUS inner Frame.

Momentarily pressing button A or B on the RC-21TB activates the STEP-IN process (allowing
this machine’s input to be selected on the VP-81SID) in Machine A or Machine B, respectively.

Figure 6: Connecting the: RC-21TB

KRAME R E L E C T R O N I C S L T D .

User Manual

MODEL:

RC-21TB

2-Button Contac t Cl os ur e Sw it ch

For the latest information on our products and a list of Kramer
distributors, visit our Web site where updates to this user manual may be
found.

We welcome your questions, comments, and feedback.

www.kramerelectronics.comWeb site:

E-mail: [e-mail]

P/N : 2 900 -3002 97 Rev 3

P/N:

2900-300297

Rev:

3

!

SAFE TY WARN IN G
Disconnect the unit from the power
supply before opening and servicing