User's Manual

400A Series clocks and calendar clocks, when fitted with a 404.2 (RS232) or 404.4 (RS485) optional internal
interface module, are capable of synchronisation to one of three serial ASCII data message formats and will
transmit messages in seven formats. The clock may be programmed to receive or transmit messages at 1200,
2400, 4800 or 9600 baud - program function 10 -, seven or eight data bits - program function 11 - and odd
or even parity - program function 12.
When programmed to transmit serial messages - by selecting options 1 to 7 of program function 9 - the clock
will transmit a new message at every second edge. If the clock is programmed to transmit in one of the two
`on-demand’ modes - program function 7 , selections 4 or 5 - the message will only be transmitted following
the receipt of an ASCII `T’ or `t’ - program function 7, selection 4 - or the closure of an external voltage free
switch contact - program function 7, selection 5.
Output Format 1 (Input synchronisation - program function 3, selection 18)
STX Su St Mu Mt Hu Ht Du Dt Mtu Mtt Yu Yt Stt ETX
Output Format 2 (Input synchronisation - program function 3, selection 19)
TYt Yu :Mtt Mtu :Dt Du :0W:Ht Hu :Mt Mh :St Su CR LF
Output Format 3
TYt Yu :Mtt Mtu :Dt Du :0W:Ht Hu :Mt Mh :St Su `_’ St CR LF
Output Format 4
TYt Yu :Mtt Mtu :Dt Du : 0W:Ht Hu :Mt Mh :St Su .Sht Shu CR LF
Output Format 5
TYt Yu :Mtt Mtu :Dt Du :0W:Ht Hu :Mt Mh :St Su .Sht Shu`_‘ St CR LF
Output Format 6 (Input synchronisation - program function 3, selection 20)
*Ht Hu Mt Mu St Su CR LF
Output Format 7
*Ht Hu Mt Mu St SuSht Shu CR LF
`t’ = tens, `u’ = units value
Byte Description ASCII Byte Description ASCII
value value
STX start transmission 02H Sh
1
/
100
seconds 30 - 39H
ETX end transmission 03H S seconds 30 - 39H
Stt status - see table M minutes 30 - 39H
T start transmission 54H H hours 30 - 39H
CR carriage return 0DH W day-of-week 31 - 37H
LF line feed 0AH D day-of-month 30 - 39H
: colon 3AH Mt month 30 - 39H
. point 2EH Y year 30 - 39H
`_` space 20H 0 zero 30H
* start character 2AH
Status Byte - ASCII value 30H - 3FH
Bit 0 0 = MSF 1 = DCF
Bit 1 0 = Winter time 1 = Summer time
Bit 2 0 = not synchronised 1 = synchronised
Bit 3 0 = no early warning bit 1 = early warning bit
12
Serial ASCII Data Formats
Issue 2.2