Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 148)

Serial Port Commands
DTE-DCE Local Flow Control +IFC
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WM_DEV_OAT_UGD_049 - 001 VOLUME 1 August 23, 2007
8.4.4 Parameter Storage
The <DCE_by_DTE> and <DTE_by_DCE> parameters are stored in EEPROM using
AT&W command. The default value can be restored using AT&F.
8.4.5 Examples
Command Responses
AT+IFC=? +IFC: (0,2),(0,2)
OK
Note: Possible values
AT+IFC=0,0 OK
Note: New values
AT+IFC? +IFC: 0,0
OK
8.4.6 Notes
If USB port is used:
• the action command is supported for compatibility reasons (but without effect),
• the response to the action command is the same as if sent on UART1 or
UART2 and the value of the both parameters is always 2.
When <DCE_by_DTE> parameter is set to 2 (DTE prompts flow control through RTS),
DCE behavior is as follows:
• If the DCE has never detected RTS in the high (or ON) condition since startup,
then it ignores RTS (assuming this signal is not connected).
• As soon as the DCE detects RTS high, the signal acts on it. Therefore,
subsequent RTS transition to OFF will prevent the DCE from sending any
further data in both online and offline modes.
This behavior allows the user to use the default settings (hardware flow control) and
leaves RTS disconnected. In the case the RTS is connected and is high at least once,
it acts on the DCE.
When the <DTE_by_DCE> parameter is set to 0 (none), the CTS is kept high all the
time.