Specifications

APPENDIX C: EVENT PROGRAMMING
Page 197 MRC-565 Packet Data Radio Operations & Maintenance
Bit-name
Bit Name
I/O; Voltage Range
Definition
Description
BIT0-
BIT15
Status Register Bits
0 or 1
The bit names BIT0, BIT1, …through BIT15
correspond to the bits of the 16-bit status register.
BIT0 is the low order bit, BIT15 is the high order bit.
DTR
Input; TTL 0V to 5V
Data
Terminal
Ready
RS 232 serial port signal indicating the data terminal
connected to the serial port is ready and able to
receive data from the MRC-565 (dataset) on Rx Data.
RTS
Input; RS 232 ±10V
Request to
Send
RS 232 serial port signal indicating the data terminal
connected to the serial port wants to transmit data to
the MRC-565 (dataset) on Tx Data.
CTS
Output; TTL 0V to 5V
Clear to
Send
RS 232 serial port signal indicating the MRC-565
(dataset) is ready and able to receive data from the
data terminal connected to the serial port on Tx Data.
RING
Output; RS 232 ±10V
Ring
Detected
RS 232 serial port signal indicating the MRC-565
(dataset) is wants the attention of the data terminal
connected to the serial port.
MCLK
Output; TTL 0V to 5V
Clock
These three signals can be used as individual inputs
and outputs as noted. In addition they can be used to
communicate with the external I/O expander using a
clocked serial high speed data stream.
MDIR
Output; TTL 0V to 5V
Data In
MSET
Input; TTL 0V to 5V
Data Out
IN1,IN2
IN3,IN4
Optically Isolated
Inputs 0-5 Volts
0 or 1
Typically requires an input greater than 1 volt to
trigger an input transition from 0 to 1.
RO1,RO2
Relay Contacts
NO,NC
Provides NO,COM,NC contacts
GPS
GPS status
0 or 1
Current GPS receiver status and RS-232 port
condition. 0=V0 or RS-232 disconnected. 1=V1 or
V2 and RS-232 connected.
NET
Network Status
0 or 1
Network online/offline status. 0=offline , 1=online
T1 – T8
32-bit Timers can be
used both as an Input
and as an Output.
Timers range from 0
to 16,777,216 counts.
(12 days, 2 hrs, 18
min, 58.5 seconds)
0 or n
Timer registers. When these are set to a non-zero
value, they will count down one count for each 1/16
second (62.5 milliseconds).
Use action = SET, T1, nnnn to start counting. These
all are set=0 on reset. Power fail/restart will retain the
count at power fail.
C1 – C8
32-bit Counters can be
used both as an input
and as an output.
Counters can range
from 0 to 16,777,216
counts.
0 or n
Counter registers. These can be set to a value, cleared
to zero, incremented or decremented. A 0 decrements
to 16,777,216. A 16,777,216 increments to 0.
A1-A24
32-bit Accumulators
can be used both as an
input and as an output.
Value can range from
0 to +/-16,777,216
0 or n
General purpose accumulators. These are used for
computational or temporary storage of numerical
values.
Each of the bit-names in the above table can be used in Event and Action definitions. The
DIOHI/DIOLOW events can use DTR, RTS, IN1-4, GPS, NET, T1-T8, C1-C8, A1-A24 as inputs. The