User's Manual
Part 1 − Universal Socket Connectivity Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342K) 21
Board Components
Jumpe
r
Description
JP1
Mutes the speaker. Default positions are 1 and 2 (speaker is not muted).
JP2
Ties the TX and RX clock lines together. Default positions are 1 and 2 (transmit and receive
clock act independently).
JP3
Sets the data rate. NORMAL sets the data rate at 250kbps.
H.S. (high speed serial communications) sets the data rate at 1Mbps.
JP4
Testing interface (debugging) for the RS-232 signals.
JP5
JP5 acts as a replacement for pin 45 when pin 45 is used for another function.
JP7
Testing interface (debugging) for the serial TTL signals.
JP9
JP9 is the 5V / 3.3V regulator. The factory default operating voltage is 3.3V.
Warning – Be sure that the 5V / 3.3V jumper is set to match the requirements of your
SocketModem. If this jumper is set incorrectly, damage to the SocketModem and/or the
Test/Demo card could result.
Caution – Use only the provided Multi-Tech Systems, Inc. transformer with the Test/Demo
board. Use of any other power source will void the warranty and will likely damage the
Test/Demo board and the SocketModem. The transformer connector is keyed to prevent
improper connection to the Test/Demo board.
JP12
JP12 allows you to select either the internal 5V regulator (INT 5V) or to choose EXT 5V. For
the EXT 5V, you can use your own external 5V power source and plug it into J7.
JP13
Set either 5V or 3.3V for USB_VBUS line (supplied by the VCC of the USB jack).
JP14
Internal testing.
JP15
JP15 disconnects pin 45 from SLP with JP5 (the RS-232 driver sleep mode).
JP16
JTAG header.
JP17
Mosquito header. If used to debug the SocketModem while using the USB port, then the JP14
would have to be removed to disconnect USB_VBUS.
JP18
Power feed for area where SocketModems are placed (J24).
JP19 & JP20
Debugging probes.
JP25 & JP26
Ground lug.
S4
Set the switch block to the product being used.
S5
Reset
Jumpers and Corresponding Signals
J4 and J7
10 PWR
8 CTS
6 DSR
4 DTR
2 RXD
9 RI
7 RTS
5 GND
3 TXD
1 DCD
J2 and J13
2 RXC 1 TXC
JP10 JP11
TX Term RX Term