Electrical Connection Of The Modem - Thermo Scientific V.22/212A User Manual

2.2 ELECTRICAL CONNECTION OF THE MODEM

When installing the V.22/212A Modem Card in a hazardous location, wire all circuits connected to
the modem using Class-I, Division-2 wiring methods as specified in Article 501-4(b) of the National
Electrical Code, NFPA 70, or in Section 18 of the Canadian Electrical Code, Part 1.
WARNING:
BEFORE CONNECTING OR DISCONNECTING THE
V.22/212A MODEM CARD, ENSURE THE AREA IS
NON-HAZARDOUS.
The V.22/212A modem has three connectors: a telephone connector J6, a power connector J5, and a
RS-232 connector J4. The telephone connector requires a standard miniature six-position RJ11C
telephone plug. Only the TIP and RING lines are used, J6-2 and J6-3, respectively.
All wiring connections to the power connector J5 terminate in cage-clamp screw terminals that
accept stranded-wire sizes to 14 AWG. Strip the wire ends approximately 3/16 of an inch. Inspect
the stripped wire for nicked and frayed ends. Insert the stripped wire completely in the clamp, then
tighten the clamp using a small common screwdriver. Inspect each connection, ensuring no frayed
strands protrude and no insulation is in the clamp.
The RS-232 connector J4 mates to a 25-position DB25P connector. After the connectors are mated,
secure the connection with two 4-40 screws.
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