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Instruction Manual
Device Specific Serial Communication Info - ASCII Protocol
8.3
The standard IGM402 model provides RS485 serial communications with capability for the user to select the
type of protocol desired. The device default setting is 'BINARY'. To set the IGM402 to be used with RS485 ASCII
protocol, see – FORMAT at
The following information and the RS485 command protocol summary listed on the following page can be used
to establish serial communications with the device using ASCII protocol.
1. Default settings are 19,200 baud rate, 8 data bits, No Parity, 1 stop bit [Factory default; 19,200, 8, N, 1].
2. The baud rate can be set to various values using the front panel soft-keys. See
in section 8.2 RS485 Command Protocol Summary table for commonly used baud rates. Baud rate used
by device (slave) must be the same as used by the host (master).
3. Minimum interval between commands sent out over the RS485 bus is 50 msec.
4. The stop bit is always 1.
5. All Responses are 13 characters long.
6. 'xx' is the RS485 node address of the device (00 thru FF).
7. <CR> represents a carriage return, a non-printable character. Do not enter <CR> from your keyboard. A
carriage return, non-printable character may be entered as the Unicode CO controls specified value: OD
hexadecimal (13 decimal). From your keyboard, a key entry sequence of CNTL-M may be used to obtain the
required character for a carriage return when using certain terminal emulator programs.
8. '_' represents a 'space' character. Press the space bar on your keyboard. Do not enter a '_'
(underscore) character.
9. The 'z' in the set or read/set trip point commands is a '+' or '-'. The plus (+) is the 'turns ON below'
setpoint and the minus (-) is the 'turns OFF above' setpoint.
10. All commands sent to the module start with a '#' character, and all normal responses from the module
start with a '*' character. Error responses start with a '?'.
11. A valid address must be used [Factory default = 1]. The IGM402 will not respond to a command with an
invalid address.
12. The command syntax examples used in the protocol summary table for ASCII are shown in scientific
notation. However, floating point notation is acceptable as long as a leading digit is entered as '0.' or
'1.', etc. There must be a digit to the left of the decimal point. For example, when constructing the
syntax for the command to set the CGn zero value (e.g.,
notation
, use either #xxTZn_0.00<CR>, or #xxTZn_0<CR>. A simple '0' is valid for the pressure entry.
)
InstruTech
section 5.8.6
SETUP COMMS
.
#xxTZn_x.xxE-pp<CR>
IGM402 Hornet
SET COMMS BAUD RATE
when using scientific
Page 68
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