COMHP 7404/-D25
CyberResearch
®
Serial Communications
Interface Mode Examples SW1 – SW4 (continued)
1 2 3 4
ON
OFF
AT RT NE T
Figure 4 - Switches SW1- SW4, RS-485 ‘RTS’ Enabled, with ‘No Echo’ and no termination resistor in circuit.
1 2 3 4
ON
OFF
AT RT NE T
Figure 5 - Switches SW1- SW4, RS-485 ‘RTS’ Enabled, with ‘Echo’ and no termination resistor in circuit.
Address and IRQ selection
The
COMHP 7404
is automatically assigned resources by your motherboard BIOS. Only the I/O addresses may be modified
by the user. Adding or removing other hardware may change the assignment of I/O addresses and IRQs.
4
©Copyright 2010
CyberResearch, Inc.
