Applications
RFI-9256 Radio Modem User Manual
Page 57 of 109
6.13 Hayes Dial-up Auxiliary I/O
Hayes dial-up connections can be used to control auxiliary I/Os. Whenever a dial-up connection is
established, the I/Os will mirror each other. When the dial-up connection is terminated the I/O outputs on
either end of the connection will retain their state but will no longer change. This scenario is shown in Figure
26.
RFI-9256
Master
RFI-9256
Slave 1
RADIO CONFIGURATION
Unit is a MASTER
Network Address: 26
Hopping Pattern: 30
Local Address: 1000
PROTOCOL CONFIGURATION
Main Port: Hayes Dial-up
AUXILIARY I/O CONFIGURATION
Auxiliary I/O Follows Remote ENABLED
Direction: Bit0 = output; Bit1 = input
Power-up default: Bit0 = Low, Bit1 = N/A
RFI-9256
Slave 2
RADIO CONFIGURATION
Unit is a SLAVE
Network Address: 26
Hopping Pattern: 30
Local Address: 2000
PROTOCOL CONFIGURATION
Main Port: Hayes Dial-up
AUXILIARY I/O CONFIGURATION
Auxiliary I/O Follows Remote ENABLED
Direction: Bit0 = input; Bit1 = output
Power-up default: Bit0 = N/A, Bit1 = Low
RADIO CONFIGURATION
Unit is a SLAVE
Network Address: 26
Hopping Pattern: 30
Local Address: 3000
PROTOCOL CONFIGURATION
Main Port: Hayes Dial-up
AUXILIARY I/O CONFIGURATION
Auxiliary I/O Follows Remote ENABLED
Direction: Bit0 = input; Bit1 = output
Power-up default: Bit0 = N/A, Bit1 = Low
0 1
0 1
0 1
Figure 26: Hayes Dial-up auxiliary I/O
In the Hayes dial-up situation, when the Master dials Slave 1, the auxiliary I/O 0 on the Master will mirror
the value on Slave 1, while I/O 1 on the Master will be mirrored on I/O 1 of Slave 1. When the Master
hangs-up the connection, I/O 1 on Slave 1 will remain at the last value of I/O 1 on the Master.
The same situation can be repeated when the Master dials Slave 2.
For more information on the Hayes dial-up protocol and connection management, see section 5.3.3 on page
34.
