Service manual

Service Manual SD170E Series
Page 33 of 44
9
CMD_EN
It indicates that command for Modem programming
is effective.
I/P
10
CMD_IN/OU
T
Data Input and Output for Modem programming.
I/P,
O/P
11
CMD_CLK
Clock Input for Modem programming.
I/P
12
MODEM_SE
L
It Indicates modem type to Master MCU for
programming.
O/P
13
RX_IN
The FFSK/MSK signal input for the receiver of
modem IC.
I/P
14
TX_OUT
The FFSK/MSK signal output when the transmitter
is enabled.
O/P
Connector
2
1
Serial_IN
The Serial data to be transmitted is input to this
pin.
I/P
2
Serial_OUT
The recovered asynchronous serial data output
from the receiver.
O/P
3
Busy
To eliminate data loss according to buffer
overrun of slave MCU‟s memory, it indicates
buffer status.
O/P
4
Carrier Detect
Handshake signal for RTS control mode. It
indicates whether Slave MCU of modem has
decoded data or not.
O/P
5
PTT_IN
Handshake signal for RTS control mode. It
requests data transmission to Slave MCU of
modem.
I/P
6
PROGRAM
It‟s reserved input for firmware upgrade.
I/P
ACC-515E (GPS Option board)
Pin
No.
Function
Description
Input/
Output
1
VCC
6V to 12V Power Input
I/P
2
VBAT
Backup Power Input (3.3V)
I/P
3
ENABLE
GPS Data Out Enable
I/P
4
PSAVE
GPS Power Enable (& Power save input for GPS)
I/P
5
GND
Ground
6
GPS_OUT
Position Data Output
O/P
7
DGPS_IN
DGPS Correction Data Input
I/P
8
GPS_IN
Initial Setting Data Input
I/P
9
+5V
5V Power Input
I/P