EUCHNER HBAS - Manual (Page 19)

EUCHNER Hand-Held Pendant Station
9. Initialization
To enable the communication interface, the hand-held pendant station must be initialized.
The initialization is performed either by polling the current states of the keys with the
"Status polling" ("Statusabfrage") function (section 9.1) and the transfer of parameters
(section 9.2), or by sending another valid command byte (section 10.3 Overview of
commands).
The baud rate is also set on initialization (see section 5).
9.1 Status polling (command byte 23H)
The state of the keys and the error byte can be polled by the control system at any time
using the command byte 23H.
The error byte remains set until a status poll has been performed or a further error-free
transfer is made.
After the status polling the error byte is reset to 31H (no error).
It is recommended to perform a status poll for initialization after the reception of a NAK
character, as in this way the HBAS is reset.
The control system requests the current status from the HBAS
HBAS Control system
Byte 1 STX (02H)
Byte 1 DLE
Byte 2 STATUS WORD (23H)
Byte 3 DLE (10H)
Byte 4 ETX (03H)
Byte 5 BCC
Byte 2 DLE
The HBAS sends its current status to the control system
Control system HBAS
Byte 1 STX (02H)
Byte 1 DLE
Byte 2 KEY BYTE (see section 7)
Byte 3 ERROR BYTE (see section 9)
Byte 4 DLE (10H)
Byte 5 ETX (03H)
Byte 6 BCC
Byte 2 DLE
The control system is only allowed to continue the transfer of data when the HBAS has
completed the transfer of the status.
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