Service Manual
Page 36 of 50
Command
COMMENTS
ENQ (05h)
Starts the communication sequence
ACK (06h)
Data Available
NAK (15h)
No acknowledgement
DC1 (11h)
Data Request (Format 1, Weight Only)
DC2 (12h)
Data Request (Format 2, Total Price, Weight, and Unit Prict)
STX (02h)
Start of text
STA
Status
–
“S” when stable, U when unstable
Sign
Space (
20h) when zero or positive, “
-
“
(2dh) when negativ
e, “F” (46h)
when overflow.
Weight
6 bytes with MSD first and including decimal: W4W3.W2W1W0
Weight Units
2 bytes for weight units (i.e. Kg) following Weight data
Price
8 bytes with MSD first and including decimal: P6P5P4P3P2.P1P0
Spaces are used for leading non-significant digits, i.e. a price of 15.00
would be transmitted as “ 15.00” with four leading spaces.
Unit Price
8 bytes with MSD first and including decimal: U6U5U4U3U2.U1U0
Spaces are used for leading non-significant digits, i.e. a price of 15.00
would be transmitted as “ 15.00” with four leading spaces.
BCC
Block Check Character calculated as the even column parity
(Longitudinal Redundancy Check) of all characters except the STX
and ETX.
ETX (03h)
End of text
EOT (04h)
End of transmission
6.1.1.4 Command Flow
Format 1
ECR
Scale
COMMENTS
ENQ (05h)
ACK (06h)
Data Available.
Errors could be:
NAK - no acknowledgement
DC1 (11h)
Data Request
Errors could be:
NAK
–
no acknowledgement
SOH STX STA SIGN W4W3.W2W1W0 kg BCC ETX EOT
Transmitted Data
Format 2
ECR
Scale
COMMENTS
ENQ (05h)
ACK (06h)
Data Available.
Errors could be:
NAK - no acknowledgement
DC2 (11h)
Data Request
Errors could be:
NAK
–
no acknowledgement
SOH STX P6P5P4P3P2.P1P0 BCC ETX STX STA SIGN
W4W3.W2W1W0 kg BCC ETX STX U6U5U4U3U2.U1U0 BCC
ETX EOT
Transmitted Data
Note: Spaces depicted in the description above are only used for ease of reading.
