Series EJ, ET, EY, FJ & FR
102002-177 Rev M2
55
\1020\02177M2.doc 17 Jun 2019
ERROR RESPONSES (E) AND ILLEGAL CONDITIONS
Error responses are messages sent back to the computer in response to a
communication error detected on receipt of an S, Q, or V command or an illegal
setting in an S command. The 5 byte error response packet takes the following form:
E 1 byte error code 2 byte checksum >CR>
The checksum is only calculated on the 1 byte error code. For example, for error 5,
the error byte will be transmitted as 35 hex. The checksum of 35 hex is 35 hex
which is transmitted in ASCII as two bytes containing 33 and 35 to represent the 3
digit and 5 digit, respectively.
Error Codes Are:
1. Undefined Command Code – the command character received was not an S, Q,
or V. The power supply will send back this error message if the second
character of the received command packet is not an S, Q, or V. The error
packet that will be returned to the computer will be:
Characters sent: E 1 3 1 <CR>
In ASCII coded hexadecimal: 45 31 33 31 0D
2. Checksum Error – the transmitted checksum received in the command packet did
not match the checksum calculated on the received bytes. The error packet
that will be returned to the computer will be:
Characters sent: E 2 3 2 <CR>
In ASCII coded hexadecimal: 45 32 33 32 0D
3. Extra Byte(s) Received – a byte other than the carriage return character was
received in the last expected byte position of the command. The error packet
that will be returned to the computer will be:
Characters sent: E 3 3 3 <CR>
In ASCII coded hexadecimal: 45 33 33 33 0D
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