EFD ULTIMUS V User Manual page 34

APPENDIX B
RS-232
Connection
Protocol
1.3 Communication Sequence
There are two communication sequences that the Ultimus V uses. The first is a download
command sequence and the other is a feedback command sequence.
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1.3.1 Download Commands
The Download commands are used when the Remote Host sets a parameter on the Ultimus
V but does not require feedback data. The download command sequence follows the steps
listed below.
1. The Host transmits an Enquiry (ENQ) command to the Ultimus V.
2. The Ultimus V receives the ENQ and transmits an Acknowledge (ACK) back to
the host.
3. When the Host receives the ACK, the Host will send the command packet.
STX+08+PS--+0500+FO+ETX for example.
4. When the Ultimus V receives the command packet and the command was
successfully executed, the Ultimus V transmits an 'A0' command.
If there was an error in the command packet, or the command could not be
executed, or the transmission was interrupted and timed out, the Ultimus V will
transmit an 'A2' command.
5. After the host receives either an A0 or A2 command, the host can either
transmit another command packet or the host can transmit an End of
Transmission (EOT) command to end the sequence.
Host
ENQ
'PS 0500'
EOT
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ACK
'A0'