Network Controllers Manual
55
Specifications
Specifications
Communications
Each loop Half Duplex 9600 baud max.
Input Voltage
24 VDC @ 150 mA
Loop Maximums
9600 feet between any 3 modules. Ten
modules max. per loop.
Mounting
1/2 Standard Footprint
Installation
Caution:
Disconnect power before removing or installing module.
The SO-20D module may be mounted on the 1/2 footprint space
immediately to the left of the CM mother board, or mounted on the
backbone mounting studs immediately below the CM motherboard. A
maximum of ten 20 mA devices may be installed on any loop.
Note:
Route data channel 1 and data channel 2 cables separately such
that a single incident e.g. fire or accidental cutting will not damage
(shorted or open conductors)
both
cables. Riser cables should be
separated by 2 hour rated fire resistive construction or minimum of 20’.
Plug Connections
P1 Connects to COMM-3S Communications card (P/N 130144) or
P2 of another SO-20 module with 10 conductor ribbon cable (P/N
250099).
P2 Used to connect SO-20D channel 2 to a SAN-CPU, or REM card.
P3 Used to connect SO-20D channel 1 to a SAN-CPU, or REM card.
Note:
Red striped edge of ribbon cable assembly is always installed
toward notched (pins 1 and 8) end of IC sockets.
RS-485 Driver Chip (SN 75176) Designation
Device
Class B (Style 4)
Class A (Style 7)
ACP Audio Control
Board (P/N 150048)
U2 N/A
ACP6 (P/N 240077)
U2
N/A
FCCD U19
U20
IRC-1 Optical Isolation
Board (P/N 150055)
U3 U2
RASP (P/N 150031)
U10
U11
SAN CPU (P/N 150125)
U3
U4
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