Specifications

Section 4: Wiring
4-15
4.7 HOST AND SYSTEM TERMINAL
INTERFACE WIRING
The host connector and the terminal connector on the Alto 818 provide RS-232C serial data
interfaces for a host computer and a terminal, respectively. The Alto 818 software default setup
is for an RS-232C null modem terminal interface cable as shown in Figure 4-11. The maximum
length of this cable must be held to 25 feet (7.6 M).
Figure 4-11: Host and Terminal RS-232C Interface Wiring Using a Null Modem Cable
When the Alto 818 is connected to a host system via an HP Terminal Concentrator (model
D2040A), the interface cable is shown in Figure 4-12. WSE recommends that this cable not
exceed 25 feet (7.6 M) in length.