MTCMR-G-F4 Multi-Tech Systems, MTCMR-G-F4 Datasheet - Page 101

• Manufacturer Part Number: MTCMR-G-F4
• Description: MODEM GPRS QUAD BAND GSM GLOBAL
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® iCellr

Specifications of MTCMR-G-F4

• Frequency: 850MHz, 900MHz, 1.8GHz, 1.9GHz
• Applications: General Purpose
• Interface: RS-232, USB
• Function: Transceiver, Modem
• Data Rate - Maximum: 115.2kbps
• Modulation Or Protocol: GSM, GPRS
• Voltage - Supply: 9 V ~ 32 V
• Package / Case: Module with Case
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Power - Output: -
• Sensitivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 881-1151; MTCMR-G-F4

DTE-DCE Local Flow Control +IFC
Set DCD Signal &C
Multi-Tech Systems, Inc. GPRS AT Commands Reference Guide (Document Number S000293J)
Description:
Values:
Syntax:
Description:
Values:
Syntax:
This command is controls the operation of local flow control between the DTE and DCE.
< DCE_by_DTE >
< DTE_by_DCE >
Command syntax: AT+IFC=<DCE_by_DTE>,<DTE_by_DCE>
This commands controls the Data Carrier Detect (DCD)
<n>
Command syntax: AT&C <n>
Command
AT+IFC?
AT+IFC=?
AT+IFC=0,0
Command
AT&C0
Note: DCD always on
AT&C1
Note: DCD matches state of the remote
modem’s data carrier
0 none
1 Xon/Xoff local circuit 103
2 RTS
3 Xon/Xoff global on circuit 103
Important Note:
0 none
1 Xon/Xoff circuit 104
2 CTS
Note: When this parameter is set to 0 (none), then CTS is kept high all the time.
0
1
behaviour is as follows:
•
•
•
DCD always on
DCD matches the state of the remote modem’s data carrier
If the DCE has never detected RTS in the high (or ON) condition since startup then it ignores
As soon as the DCE detects RTS high the signal acts on it. Therefore subsequent RTS
This behavior allows the user to use the default settings (hardware flow control) and leave
RTS disconnected. In the case where RTS is connected and is high at least once, it acts on
the DCE.
RTS as it assumes that this signal is not connected.
transition to OFF will prevent the DCE from sending any further data in both online and
offline modes.
Possible responses
+IFC: 2,2
OK
Note: Current values
+IFC: (0,2),(0,2)
OK
Note: Possible values
OK
Note: New values
When this parameter is set to 2 (DTE invokes flow control through RTS) DCE
(supported)
(not supported)
(supported)
(supported)
(not supported)
(supported)
(not supported)
Possible responses
OK
Note: Command valid
OK
Note: Command valid
signal.
Chapter 12 – V.24 and V.25 Commands
101