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VS-900 Architects and Engineering Specifications v1.0
11
The Direct Select Interface Card shall include an RS-232C D-sub connector, 9-pin, female for
programming the connected Direct Select I/O Card(s). The DSI shall include an integral 6-position
4-contact RJ11-type modular plug and connect to the Master Station port with twisted pair cable.
When using the Master Station, the maximum cable distance shall be the total connected
distance from the exchange to the Master Station via the VS-900DI and shall be #20 AWG: 7546
ft./1.43 mile (2.3 km); #22 AWG: 4921 ft./0.93 mile (1.5 km); #24 AWG: 2953 ft./0.56 mile
(0.9km).
The Direct Select Interface Card shall be the TOA VS-900DI.
2.5.2 DIRECT SELECT I/O (INPUT/OUTPUT) CARD
The Direct Select I/O (DSIO) Card shall connect to the Direct Select Interface Card and provide
32 sets of I/O connections. Each I/O set shall include a relay, call LED driver and direct select
input. System programming shall allow the user to associate each I/O set with a Master Station or
Sub-station. The Direct Select Interface Card shall support a maximum of thirty-two (32) DSIO
Cards. Each relay shall be normally-open type with contact capacity of 24 V DC/1 A. System
programming shall allow global configuration of the relay activation mode as call-in or answer-
activated. Each Call LED output (for LED indication of incoming and outgoing calls) shall be open
collector-type, 24 V DC/100 mA. A current limiting resistor shall be required in series with each
LED. Each Direct Select Input contact (for calling and response switch operation) shall be
activated with a dry contact switch closure with a rating of 5 VDC/0.5 mA and contact resistance
of less than 50 ohms. The DSIO Card shall require an external 24 VDC/1 A power supply. Each
type of I/O shall require a 50-position "CHAMP" IDC type (Amphenol type) connector.
The Direct Select I/O Card shall be the TOA VS-910DI.
2.5.3 DIRECT SELECT POWER SUPPLY
The Direct Select Power Supply shall provide 24 VDC with rated 3 A current capacity to support
one Direct Select Interface Card and two Direct Select I/O Cards.
The Direct Select Power Supply shall be the TOA XPS-24VS.
2.6 REMOTE CONTROL AND MONITORING
The security intercom system shall allow external remote control and monitoring of intercom
system functions through the exchange mainframe serial port. The intercom manufacturer shall
provide a serial communication protocol document. The installing contractor shall be solely
responsible for the correct operation and performance of the security intercom system and all
external equipment connected to the intercom system.