Black Box RS-422, RS-232, RS-485, IC107A Instruction Manual

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INFORMATION

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NOVEMBER 1993

IC107A

RS-232↔RS-422/485 Converter

(Data Only)

232

↔

422/485 CONVERTER

DATA ONLY

RX TX PWR

2

RS-232↔RS-422/485 Converter (Data Only)

FEDERAL COMMUNICATIONS COMMISSION

RADIO FREQUENCY INTERFERENCE STATEMENT

This equipment generates, uses and can radiate radio frequency energy
and if not installed and used properly, that is in strict accordance with the
manufacturer’s instructions, may cause interference to radio communication.
It has been tested and found to comply with the limits for a Class A
computing device in accordance with the specifications in Subpart J of
Part 15 of FCC rules, which are designed to provide reasonable protection
against such interference when operated in a commercial environment.
Operation of this equipment in a residential area is likely to cause
interference, in which case the user at his own expense will be required
to take whatever measures may be required to correct the interference.

Any other trademarks mentioned in this manual are acknowledged to be the property
of the trademark owners.

3

Contents

Contents

Section Page

1. Specifications ................................................................................................ 4

2. Introduction.................................................................................................. 5

2.1 Typical Applications................................................................................ 5

3. Installation .................................................................................................... 7

4. Operation...................................................................................................... 9

4.1 RS-232 Circuitry....................................................................................... 9

4.2 RS-422/485 Circuitry .............................................................................. 11

Appendix: Connector Pinning ........................................................................ 12

4

RS-232↔ RS-422/485 Converter (Data Only)

Speed — Up to 64 Kbps

Maximum Distance — 4000 feet

(1219 m)

Operation — 4-wire, full-duplex;
point-to-point or multipoint; user­configurable DTE/DCE RS-232 port

Leads supported — RS-232 port: 1­8, 20; RS-422/485 port: TXA, TXB,
RXA, RXB

Indicators — (3) LEDs: TX, RX,
POWER

Flow control — Transparent to flow
control

Interface — Asynchronous RS-422/485;
asynchronous RS-232

Connectors — (1) DB25 female;
(1) four-pin terminal block

Temperature — Operating: 32° to
122° F(0° to 50° C); Storage: -4° to
158° F (-20° to 70° C)

Humidity — 0 to 95% noncondensing

Mean Time
Between Failures
(MTBF) — 200,000 hours

Power — Primary: 115 VAC/60 Hz

model, @ 70 mA, or 230 VAC/50 Hz
model, @ 35 mA; Secondary: 17 volt
center tapped, 0.7 ma; Connector
pinning:

Pin Function
1 Frame ground
2 Secondary
3 Secondary
4 Signal ground

(center tap)

Size — Standalone unit: 1.8"H x

5.5"W x 8.5"D (4.6 x 14x 22 cm);
Rackmount card: 4.7"H x 7.4"W
(12 x 19 cm)

Weight — Standalone unit: 1 lb. (0.5
kg); wallmount power supply: 0.5 lb.
(0.2 kg); Rackmount card: 0.5 lb.
(0.2 kg)

1. Specifications