RTS SSA-424A manual Wire Call Send and Call Enable/Inhibit, Wire Call Receive

4-Wire Call Signal Connections

TABLE 3. UIO-256 GPI Outputs Connector (J5)

		GPI OUTPUT NUMBERSa			RELAY CONTACT PIN NUMBERS
					NORMAL		NORMAL
	UIO-256	UIO-256	UIO-256	UIO-256	CLOSED (NC)	COMMON	OPEN (NO)
	FRAME #1	FRAME #2	FRAME #3	FRAME #4	CONTACT	CONTACT	CONTACT
15		31	47	63	35	10	37
16		32	48	64	36	11	12

a. Dependent on UIO-256 DIP Switch SW1 Settings for Input/Output Range as summarized in the UIO-256 manual.

Call Signal Connections for other 4-wire

Communications Systems

4-wire Call Send and Call Enable/Inhibit

The SSA-424A accepts a switch-contact input from the

4-wire system and then generates a call signal output to the 2-wire system. The SSA-424A also accepts an optional switch contact input to enable or inhibit call signaling between the 4-wire and 2-wire systems. Figure 6 shows the typical connections.

FIGURE 6. Typical call send and call enable/inhibit connections for a 4-wire intercom system.

4-wire Call Receive

The SSA-424A receives call signals from the 2-wire system, then converts this to relay contact closure for use as a 4-wire call receive indication. The SSA-424A also provides +5 VDC which can be connected to the relay contacts to generate a DC output signal instead of a contact closure. Connections for a simple contact are shown in Figure 7 on page 12.

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