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The 1000 Series is a family of low speed asynchronous micro line drivers used at each end of a point-to-point communications link to provide a convenient and inexpensive data path across extended distances of ordinary unshielded twisted-pair (UTP) cabling. These Micro Line Drivers draw their power directly from the RS232 I/F and provide full-duplex data transfer across two 24 AWG twisted pairs out to distances of 5 miles at 19.2Kbps.

This 1000 Series of Micro Line Drivers includes six combinations of RS232 and transmission line connections.  The RS232 DB25 connector can be male or female. The transmission line connection can be a 4-wire terminal block, an RJ-45 jack or a 7 foot modular phone cable with RJ-11 plug.

The 103X and 104X units are equipped with an externally accessible DTE/DCE switch allowing the end-user to select which interface type will be presented on the RS232 interface. The DCE interface will handshake and communicate directly with a terminal or computer. The DTE interface will handshake and communicate directly with another piece of communications equipment such as a modem or multiplexer. This allows use of these micro line drivers in tail circuits without need of a crossover cable.

All units draw their ultra-low power directly from the RS232 interface. When configured as a DCE device, they require a minimum of +5 Volts on pins 4 and/or 20.  When configured as a DTE device, they require a minimum of +5 Volts on a least one of pins 5,6 or 8.

All units include transient suppression components that help protect the attached terminals or computers against transient voltages that might be induced in the transmission line by lightning strikes or power disturbances. 


The 1000 Series Micro Line Drivers provide a convenient and inexpensive communications capability across the existing infrastructure of UTP copper cabling typically found in campus environments. Their small size and freedom from any power source allows them to offer very simple, uncluttered solutions in data transmission applications. Their most traditional application was for connecting dumb terminals, or PC's operating in terminal emulation mode, to a mainframe host. They can also be used to establish communication links between remote security, monitoring, process control or point-of-sale devices and more centrally located controllers or computers.


ModelRS232C ConnectionRS232 Device TypeTransmission Line ConnectionMini2.GIF (27090 bytes)
1010MaleDCE7ft. line cord with RJ-11 plug
1031FemaleDCE/DTE4-wire terminal block
1040MaleDCE/DTERJ-45 jack
*We are licensed on patents for Mini Line Driver Series


Data Rates0 - 19.2 Kbps
PowerExternal power not required. Extracts low power directly from RS232 interface
TransmissionAsynchronous, full duplex data transfer across two-twisted pairs (UTP cable)
Range (24 AWG)Up to 5.0 miles at 19.2 Kbps
Size.6"H x 1.6"W x 2.0"D
Temperature32-122 degree F (0-50 degree C)
HumidityUp to 95% non-condensing