HP 24SII - Manual (Page 164)

"500H" Series and the Model 24SII DAC Data Acquisition and
Control units connect between one host computer and multiple
peripheral devices. These models are often used in industrial
process-control environments (e.g., for allowing control of multiple
numerical or assembly-line machines), in exchanging data between
point-of-sale devices, or for operating a number of laboratory
instruments or business machines from a central computer. They are
especially effective in adapting small low-cost personal computers to
these applications. Each unit features six modes of operation which
may be easily configured to your application. The 500H series
models are available with either 5 or 9 ports. The Model 24SII DAC
unit is expandable from 4 to 24 ports in 4-port modular increments.
Telplex Models TX104 and TX108 are asynchronous statistical
multiplexers which multiplex and demultiplex four or eight
communications channels over a single channel. This single channel
is typically a telephone line or cable. The TX24 will multiplex and
demultiplex up to twenty channels. Programmable features include
serial port parameters (baud rate, word size, etc.), data flow control,
user-programmable strings to be sent to an external modem, and
remote diagnostics/configuration capability. These units must be
purchased in pairs.
Telplex Model TX104M is an asynchronous statistical multiplexer with
built-in modem. Four individual communications channels are
multiplexed into a single dial-up or leased telephone line, cutting
phone line costs to a minimum. The TX104M features a V.22 bis
internal modem which provides reliable communication at speeds up
to 4800 bps. With V.42 bis protocol, the TX104M provides error
correction and Classes 2-4 data compression. Compatible with most
computers, printers, or peripherals, the TX104M ensures rapid
throughput, and offers a variety of user-programmable features in
order to meet your specific application requirements.