The S.I. Tech Model 2005 Asynchronous Optical Bit-Driver is a short haul limited distance “modem.”
At the transmission end, the Unit accepts digital information via an RS-232 connector. It converts
this data for transmission over a Duplex optical fiber transmission line. At the other end, another Bit-
Driver converts information back to a form that is RS-232 compatible.
1. SPECIFICATIONS
Operating Mode: Asynchronous, Simplex or Full Duplex
Transmission Line Interface: Two ST fiber optic connector receptacles for
interfacing with Duplex optical cable. 12 dB power budget at 880 nm for 10-9 Bit Error Rate, using
62.5 micron core fiber.
Operating Temperatures: 0
o
Celsius to + 50
o
Celsius.
Input Power: 105 to 130 VAC, 60 hz, 10 watts. Power transformer
secondary fused. Standard 3 wire cord for wall outlet, unless
220 VAC supply is required
Input/Output Interface: RS-232-C Type D Asynchronous (at 110 Bits/sec
to 115 kbits/sec.)
2. INPUT/OUTPUT INTERFACE
Input/output interface conforms to EIA standard RS-232-C, having a type D full Duplex configuration.
A female 25 pin D connector carries the following signals:
Pin Description EIA
1
Protective Ground AA
2
Transmitted Data BA to Bit-Driver
3
Received Data BB to Bit-Driver
4*
Request to Send CA to Bit-Driver
5
Clear to Send CB From Bit Driver
6
Data Set Ready CC From Bit Driver
7
Signal Ground AB
8
Data Carrier Defect CF From Bit Driver
*Optional Signals not needed for normal operation.
The functions of these signals are:
Protective Ground is a lead tied to the ground wire of the power cord. This is not a signal ground,
but is intended to connect to the RS-232 cable assembly shield, when used, to reduce radiated noise
and possible IC damage due to static discharge to the cable.
Transmitted Data is the data being sent from the local terminal to the remote Bit-Driver and terminal.
Received Data is the data being received over the transmission line from the remote Bit-Driver.
Request to Send is a control function from the local terminal. The signal is normally used on half
Duplex operation and is not required in the model 2005 Bit-Driver.
Clear to Send is a control function used by the local terminal. In the model 2005 Bit-Driver, the
Request to Send is connected to the Clear to Send with a 10 millisecond delay for equipment
Page 1
H. WEISS MACHINERY & SUPPLY
H. WEISS MACHINERY & SUPPLY
PHONE: (718) 605-0395 - www.hweiss.com
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