co561ad-d Connect One Ltd., co561ad-d Datasheet - Page 22

• Manufacturer Part Number: co561ad-d
• Description: The Co561ad-d Ichip Plus? Internet Controller? Is A Low-cost Intelligent Peripheral Device That Provides Internet Connectivity Solutions To A Myriad Of Embedded Devices.
• Manufacturer: Connect One Ltd.

5.2.4 iChip Plus Serial Modem Signals
Signal
TXDM
RXDM
-CTSM
-RTSM
-DSRM
-DTRM
-CDM
iChip CO561AD-D Datasheet
Type
O
O
O
I
I
I
I
Pin No.
29
28
27
32
65
18
66
Transmit Data Modem: This pin provides
asynchronous serial transmit data to the modem from
the serial port.
Receive Data Modem: This pin provides
asynchronous serial receive data from the modem to
the asynchronous modem serial port.
When this pin is not used, connect it to VCC.
Clear-to-Send Modem: -CTSM is active only when
modem hardware flow control is enabled.
When -CTSM is LOW, flow control is enabled to the
modem serial port, i.e., iChip Plus may transmit to
the modem.
When -CTSM is HIGH, the iChip Plus transmitter
holds its data in the serial port transmit register.
Connect -CTSM to -RTSM when not in use
Ready-to-Send Modem: -RTSM is active only when
modem hardware flow control is enabled.
When -RTSM is LOW, flow control is enabled from
the modem serial port, i.e., the modem may transmit
to iChip Plus. When -RTSM is HIGH, iChip Plus
indicates that its receiver is busy and cannot receive
data from the modem.
Connect -RTSM to -CTSM when not in use.
Data Set Ready Modem: When -DSRM is LOW, it
indicates that the modem is attached and ready to
communicate with iChip Plus.
Connect -DSRM to GND when not in use.
Data Terminal Ready Modem: When -DTRM is
LOW it indicates to the modem that iChip Plus is
attached and ready to communicate.
Carrier Detect Modem: This pin indicates to iChip
Plus that the modem detects a carrier signal.
Description
Pin Descriptions
5-7