Rs-485 Commands; Error Response From Module; Parity - HELIX GRANVILLE-PHILLIPS Convectron ATM Instruction Manual

4.3 RS–485 commands
Table 4-4 RS–485 command structure
Address field
#XX
"XX" is 2-digit address
Error response from
module

Parity

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Convectron ATM Vacuum Gauge Module Instruction Manual
RS–485 commands require entry of integer values, hex code values (such as
"0F"), values in engineering notation (such as "2.00E+02"), and
alphanumeric character strings. The ↵ symbol at the end of the command
represents the carriage return (CR), which is entered as hex code 0D or by
simultaneously pressing the "Control" and "M" keys.
Table 4-4 explains the RS–485 command structure.
Command field Data field
Character string for Character string data required to
command from host execute command
First character is: Data may include:
• PC = process control • Hex code
• S = set • Pressure value in engineering
• T = calibrate
• R = read • Alphanumeric character string
If a command cannot be processed, the module will send one of the
following error responses:
• COMM ER
• NVRAM ER
• RANGE ER
• SYNTX ER
See page 66 to troubleshoot the error response.
The example set parity (SP) command sequence sets parity at seven data
bits, odd parity:
Example SP command from host:
Response from module:
• An SPO command sets parity at seven data bits, odd parity.
• An SPE command sets parity at seven data bits, even parity.
• An SPN command sets parity at eight data bits, no parity. This is the
default parity.
notation
RS–485 Module Operation
Carriage return
↵
• Enter hex code "0D"
• Simultaneously press
"Control" and "M" keys
#01SPO ↵
*01 PROGM OK ↵
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