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Pressure Systems, Inc. Model 9116 User’s Manual
Page 22 www.PressureSystems.com
3.1.3 Responses
Four (4) types of responses can be returned from a Model 9116 Intelligent Pressure
Scanner module:
• an Error response,
• an Acknowledge response,
• an Acknowledge with Data response, or
• a Network Query response.
The first three may be returned by TCP/IP commands, the latter from a UDP/IP command.
The error response consists of the letter ‘N’ (for NAK, or negative acknowledge), followed by a
2-digit hexadecimal error code. The following table lists the error codes that can be returned
from a Model 9116
module:
Table 3.1
Error Codes
CODE MEANING
00 (Unused)
01 Undefined Command Received
02 Unused by TCP/IP
03 Input Buffer Overrun
04 Invalid ASCII Character Received
05 Data Field Error
06 Unused by TCP/IP
07 Specified Limits Invalid
08 NetScanner error; invalid parameter
09 Insufficient source air to shift calibration valve
0A Calibration valve not in requested position
The Acknowledge response is returned from a module when a command is received that
requires no data to be returned, and no error is detected. It indicates successful parsing and
execution of the last received command. It consists of the letter ‘A’ (for ACK, or acknowledge).
The Acknowledge with Data response is returned when a module receives a command
requesting data. Model 9116 modules will typically return only the requested data values, each
preceded by a space character (except for format 7). No ‘A’ acknowledge letter begins this
data response. Data are returned for the highest requested channel number first.