CTI Products IOB I/O Interface - Manual (Page 10)

IOB Hardware Reference Theory of Operation
CTI Products, Inc.
68-11168-105
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An IOB has 8 I/O groups (similar to the 8 receivers per CIB module). Since each
I/O group is represented by four I/O points, a maximum of 32 I/O points can be
displayed per IOB. When configuring your MCNRCD screens for IOB modules,
know that each I/O group is related to an Rx # in the MCNRCD and MCNCFG
software. I/O group 1 is the same as Rx # 1 and so on through I/O group 8 is the
same as Rx # 8.
The basic IOB module is setup as 8 I/O groups. Each I/O group has the following
4 I/O lines:
I/O Bit
#
Type Status Byte
Binary Weight
MCNRCD Input
Status Signal
Output Controlled By
1 Input/Output 01 hex VOTE left mouse button or “V”
2 Input 04 hex RECEIVE N/A
3 Input/Output 10 hex DISABLE right mouse button or “D”
4 Input 40 hex FAIL N/A
Table 2 - I/O Point Binary Weight
Table 2 shows the binary weight of each I/O bit. These binary weights are
summed to create the input value fields of the MCNRCD.CFG text definition
line. This allows you to display up to 16 status message values for each I/O group
(receiver) on the MCNRCD screen. All valid combinations of these binary
weights must be defined by separate text definition lines (again, see the appendix
titled Changing Status Message Text in the Monitoring and Control Network
Remote Comparator Display Software Manual (reference 2) for details about
creating custom status messages). Table 3 shows the possible combinations of the
binary weights (in the Input Value Field column) and the I/O bit combinations for
that value. A column has also been provided for you to enter the text
corresponding to the input value field.
In the 1 or 4 and 1 of 8 select configurations, the output for I/O bit 3 is disabled
(only the output for I/O bit 1 can be used).
In all cases, any pin not used as an output can be used as an input. Inputs can be
dynamic inputs used to sense on and off conditions or can be static “selector”
inputs which are permanently strapped to provide a selector function for sub-
categories.