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Chapter 1 The Hybridization Oven 645
1
Communicating with the oven
Communicating with the oven
Serial
communication
20
The Hybridization Oven 645 is equipped with a 9 pin connector RS-232 serial port,
located on the rear panel. One 5 meter cable is provided in the oven accessory kit. Tx,
Rx and GND are the active pins employed by the oven. This cable may be connected
to any standard RS-232 COM port on a computer workstation. The communications
protocol is governed by the following rules:
• To communicate with the oven, employ any communication utility (i.e.,
Hyperlink) set up with a Baud rate of 9600 bits/ second, 8 data bits, no parity and
one stop bit (9600, 8, N, 1).
• Communications will occur in half-duplex mode - the oven will accept only one
query and will not accept new queries while acting on a current query.
• All query strings must be no more than 32 characters.
• Each query string starts with a "." (ASCII hex 2E) character, followed by a three-
character query, ending with a carriage return (ASCII hex 0D).
• Each reply will end with a single byte checksum in hex format and a carriage
return character. The checksum is simply the byte-wise addition of all preceding
characters in the response string.
• Communications are case-sensitive. All queries employ upper case characters.
Queries and responses:
• QSS - Query System Status
– The response is "Eaa,bbb,ccc,dd,ee,f,gg"
– aa = error code. If no error condition exists, this string is "00"
– bbb = temperature set point in tenths degree Celsius
– ccc = actual chamber temperature in tenths degree Celsius
– dd = rotation set point in rpm
– ee = actual rotation rpm
– f = door state (0 = open, 1 = closed)
– gg = hex checksum byte
• QSN - Query Serial Number
– The response is "1829aaaaaaaaa"
– aaaaaaaaa = the last nine digits of the oven serial number
• QSV - Query Software Version
– The response is "a.aa,bb"
– a.aa = software version number
– bb = hex checksum byte
• In case of a syntax error in a query, the oven will reply with the communication
error string "E22"
GeneChip
™
Hybridization Oven 645 User Guide
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