Developer's Board Manual Rev A
Page 21 of 28
SEM/CX-02:0061/MAN
3.5 Module_PWR_EN_B / Wake Selection
A power down or "sleep mode" is available in which the module is placed in a low power consumption state under
control of the host application.
The "wake up" function of the module is performed by setting position 6 in switch S3. The table below indicates
the position, which reflects the ON state for each module family.
Switch Position
Function
DM-xx
CM-4x
Position 6
MODULE_PWR_EN_B / WAKE
ON
Table 15: Module ON State
The module is reset by switching the power supply off and on, or by turning the module off and on using the
MODULE_PWR_EN_B / WAKE signal. Care should be taken to ensure that the OFF time is 4-5 seconds.
3.6 Serial
interface
The external host communicates with the Module through J2, which is a standard RS-232 9-pin interface (see
below). The straight-through serial cable provided connects from J2 (DB-9 Female) to the serial port of a PC (DB-
9 or DB-25 Female).
Pin
RS-232
Description
1
DCD
Data Carrier Detect
2
TXD
Transmission Data
3
RXD
Receiver Data
4
DTR
Data Terminal Ready
5
GND
Ground
6
DSR
Data Set Ready
7
RTS
Request to Send
8
CTS
Clear to Send
9
RI
Ring Indicator
Table 16: RS-232 DB9 Pin-out
The primary connector, J2, routes all the signals to the module interface, while level shifting the appropriate ones.
The secondary connector, J22, does not route all of the signals to the module. The following table details the
signal routing from J22.
Pin
RS-232
Routing
1
DCD
Jumper HIGH or LOW depending on X102
2
TXD
to System Connector Pin 39 (CFMS)
3
RXD
to System Connector Pin 37 (CTMS)
4
DTR
to J22 Pin 6 (DSR) through a 0 Ohm Resistor (R33)
5
GND
Ground
6
DSR
to J22 Pin 4 (DTR) through a 0 Ohm Resistor (R33)
7
RTS
to J22 Pin 8 (CTS) through a 0 Ohm Resistor (R34) and N11 Pin 12
through a 0 Ohm Resistor (R31)
8
CTS
to J22 Pin 7 (RTS) through a 0 Ohm Resistor (R34) and N11 Pin 14
through a 0 Ohm Resistor (R45)
9
RI
No Connect
Table 17: RS-232 DB9 J22 Routing
X102
Function
1-2
Jumpers J22 DCD to +12V (RS-232 Levels)
2-3
Jumpers J22 DCD to -12V (RS-232 Levels)
Table 18: Header X102 Settings (J22-DCD)