Communication Protocol
MicroHarmony Cell Sizes 40 - 260A Manual
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11.4 Error Handling
Several levels of error handling are implemented on the CCB in order to validate each message. The IMS C011
Transceiver provides the following inputs/outputs that are implemented as follows on the CCB:
Table 11-2: IMS C011 Status Indicators
11.5 Parity
The most significant data bit (bit 7) for each Modulator/CCB command/response message is used as an ODD parity
bit (i.e., 7 data bits + 1 parity bit result in an 8 bit data word with ODD parity).
The CCB parity check circuit generates a communication failure (COMFLT) if the parity is incorrect for more than
approximately 22 microseconds (i.e., 3 or more messages). Note that the 890485.02 GAL (U31) equations validate
parity for each received message.
QVALID
Indicates that data on pins Q0-7 is valid (data from Master Link)
Input for CCB 'ACTIVITY' circuit that verifies message activity from Master Link
Generates CCB Communication fault (COMFLT) if ‘ACTIVITY’ fault exceeds
approximately 15 microseconds
‘ACTIVITY’ is validated for every message by the 890485.02 GAL
QACK
Generates Acknowledge Signal from CCB to Master Link IMS C011 that Q0-7 data
was read
IVALID
Indicates that data on I0-7 is valid
Initiates transmission of CCB response to Master Link message approximately 1.2
μ
sec after QVALID received
Used as Latch Enable signal for CCB response data
IACK
Indicates that Acknowledge signal received from Master Link IMS C011 in
response to CCB transmission.
RESET
Reset circuit enabled 1.2 msec after a CCB Communication failure (COMFLT)
Summary of Contents for Eupec
Page 16: ...Cell Overview MicroHarmony Cell Sizes 40 260A Manual 1 6 19001467 Version 1 0 s 1 ...
Page 36: ...Installation MicroHarmony Cell Sizes 40 260A Manual 3 4 19001467 Version 1 0 s 3 ...
Page 42: ...Electrical Description MicroHarmony Cell Sizes 40 260A Manual 4 6 19001467 Version 1 0 s 4 ...
Page 56: ...Repair Hints MicroHarmony Cell Sizes 40 260A Manual 8 4 19001467 Version 1 0 s 8 ...
Page 76: ...Drive Calc Express MicroHarmony Cell Sizes 40 260A Manual 10 2 19001467 Version 1 0 s 10 ...
Page 86: ...Communication Protocol MicroHarmony Cell Sizes 40 260A Manual 11 10 19001467 Version 1 0 s 11 ...
Page 87: ...MicroHarmony Cell Sizes 40 260A Manual NOTES 19001467 Version 1 0 N 1 s NOTES ...
Page 88: ...NOTES MicroHarmony Cell Sizes 40 260A Manual N 2 19001467 Version 1 0 s ...
Page 89: ...MicroHarmony Cell Sizes 40 260A Manual NOTES 19001467 Version 1 0 N 3 s ...
Page 90: ...NOTES MicroHarmony Cell Sizes 40 260A Manual N 4 19001467 Version 1 0 s ...