Revision C • 1/04
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2 Installation
digital
TELCO / CODEC MODULE — LOGIC I/O
The 24-pin LOGIC I/O connector allows the
module to control, or be controlled by, the device
attached to the module.
A device can connect directly to the module or it
can connect through a switcher. Two types of switch-
ers are supported: VistaMax and the PRE99-947
External Remote Line Selector (Ext. RLS). The
source (switcher or direct) and the switcher type
(VistaMax or Ext. RLS) are set via DIP switches
DS2-4 and DS2-5.
When the module connects to an Ext. RLS, sev-
eral logic connections (pins 15, 16, 17 and 23) be-
come RLS address outputs. This change occurs only
when DS2-4 is set ON and DS2-5 is set to OFF.
When a VistaMax or other router is used (DS2-5 is
set ON), these pins do not change function since
addressing is done through the Session module.
LOGIC I/O Connector
Logic 5 VDC
Logic 5 VDC
Logic 5 VDC
no connection
Off (-)
On (-)
Logic 5 VDC
Start Command Pulse
Stop Command Pulse
Logic Ground
Logic Ground
Logic Ground
Ready (+)
Start Command Sustained / RLS-3
Reset (+)
Ready (-)
no connection
Reset (-)
Activate Logic Inputs (+)
On Tally / RLS-2
Off Tally / RLS-1
Logic Active Tally / RLS-0
Tallies/ RLS-0, -1, -2 Common
Commands/ RLS-3 Common
12
11
10
9
8
7
6
5
4
3
2
1
24
23
22
21
20
19
18
17
16
15
14
13
(wire insertion end view)
Telco / Codec Module, Logic I/O — Simplified Logic Diagram
18
19
21
7
8
24
22
13
15
23
4 Stop Command Pulse
Direct / Router: Start Command Sustained
Ext. RLS Switcher: RLS-3
Commands Common / RLS-3 Common
Direct / Router: Logic Active Tally
Ext. RLS Switcher: RLS-0
Logic Ground
Logic Ground
Logic Ground
Tallies Common / RLS-0, -1, -2 Common
Direct / Router: On Tally
Ext. RLS Switcher: RLS-2
17
16
14
1
2
3
12
11
10
6
Inter
nal Logic
5 Start Command Pulse
Direct / Router: Off Tally
Ext. RLS Switcher: RLS-1
Logic 5VDC
Logic 5VDC
Logic 5VDC
Logic 5VDC
On (-)
Off (-)
Ready (-)
Reset (-)
Activate Logic Inputs (+)
Reset (+)
Ready (+)
Notes:
Opto-Isolated inputs are current limited and work with +5 to +40 VDC logic.
Opto-Isolated outputs can sink up to 60 volts or 350 mA max. current flow.
