103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
/* NOTE:
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The IF482 Generator needs an high precise 1 Hz clock signal which cannot be
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acquired in suitable precision on the ESP32 SoC itself. Additional clocking
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hardware is required, ususally the clock signal is generated by external RTC or
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GPS which can generate a precise time pulse signal (+/- 2ppm).
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In this example code we use a Maxim DS3231 RTC chip, and configure the chips's
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interrupt output pin as clock. The clock signal triggers an interrupt on the
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ESP32, which controls the realtime output of IF482 telegram. This is why code in
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IF482.cpp depends on code in RTCTIME.cpp.
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*/
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///////////////////////////////////////////////////////////////////////////////
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/*
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IF482 Generator to control clocks with IF482 telegram input (e.g. BÜRK BU190)
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Example IF482 telegram: "OAL160806F170400"
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IF482 Specification:
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http://www.mobatime.com/fileadmin/user_upload/downloads/TE-112023.pdf
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The IF 482 telegram is a time telegram, which sends the time and date
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information as ASCII characters through the serial interface RS 232 or RS 422.
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Communication parameters:
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Baud rate: 9600 Bit/s
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Data bits 7
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Parity: even
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Stop bit: 1
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Jitter: < 50ms
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Interface : RS232 or RS422
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Synchronization: Telegram ends at the beginning of the second
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specified in the telegram
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Cycle: 1 second
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Format of ASCII telegram string:
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Byte Meaning ASCII Hex
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1 Start of telegram O 4F
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2 Monitoring* A 41
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3 Time-Season** W/S/U/L 57 or 53
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4 Year tens 0 .. 9 30 .. 39
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5 Year unit 0 .. 9 30 .. 39
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6 Month tens 0 or 1 30 or 31
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7 Month unit 0 .. 9 30 .. 39
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8 Day tens 0 .. 3 30 .. 33
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9 Day unit 0 .. 9 30 .. 39
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10 Day of week*** 1 .. 7 31 .. 37
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11 Hours tens 0 .. 2 30 .. 32
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12 Hours unit 0 .. 9 30 .. 39
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13 Minutes tens 0 .. 5 30 .. 35
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14 Minutes unit 0 .. 9 30 .. 39
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15 Seconds tens 0 .. 5 30 .. 35
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16 Seconds unit 0 .. 9 30 .. 39
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17 End of telegram CR 0D
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*) Monitoring:
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With a correctly received time in the sender unit, the ASCII character 'A' is
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issued. If 'M' is issued, this indicates that the sender was unable to receive
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any time signal for over 12 hours (time is accepted with ‘A’ and ‘M’).
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**) Season:
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W: Standard time,
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S: Season time,
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U: UTC time (not supported by all systems),
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L: Local Time
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***) Day of week:
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not evaluated by model BU-190, use "F" instead for this model
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*/
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///////////////////////////////////////////////////////////////////////////////
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#ifdef HAS_IF482
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#include "if482.h"
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String IF482_Frame(time_t t) {
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char mon, out[IF482_FRAME_SIZE + 1], buf[IF482_FRAME_SIZE - 3];
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if (sntp_get_sync_status() == SNTP_SYNC_STATUS_IN_PROGRESS)
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mon = 'M'; // time had been set but sync not completed
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else
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mon = 'A'; // time has been set and was recently synced
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// generate IF482 telegram for local time
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struct tm tt;
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localtime_r(&t, &tt);
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mktime(&tt);
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strftime(buf, sizeof(buf), "%y%m%d%u%H%M%S", &tt);
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snprintf(out, sizeof(out), "O%cL%s\r", mon, buf);
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return out;
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}
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#endif // HAS_IF482
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