CONNECTIONS
Purpose	Location	Purpose	Location
V.24, V.35, X.21, RS-530	CN1	Diagnostic test switch	DIG
AC power	CN2	Analog loopback switch	ANA
Ground	GND	Remote loopback switch	REM
Receive	RCV	Test pattern	PATT
Transmit	XMT	Reset switch	RESET

ANALOG LOOPBACK
Setting	JP2
» Enabled	Pins 2 & 3 closed
Disabled	Pins 1 & 2 closed

ASYNC TO SYNC
Setting	SW1/S1
» Synchronous	On
Asynchronous	Off

BAUD RATE
Setting	SW7
600bps	0
1200bps	1
2400bps	2
4800bps	3
9600bps	4
19.2Kbps	5
38.4Kbps	6
48Kbps	7
» 64Kbps	9
128Kbps	A
57.6Kbps	C
115.2Kbps	D

BIT
Setting	SW1/S2
» 8 bit	On
7 bit	Off

CD SIGNAL
Setting	SW1/S6
» CD forced high	On
CD normal	Off

CHASSIS TO SIGNAL GROUND
Setting	JP4
» Connected	Pins 1 & 2 closed
Disconnected	Pins 2 & 3 closed

CLOCK SOURCE
Setting	JP1/A	JP1/B	JP1/C
Loopback	Closed	Open	Open
» Internal	Open	Closed	Open
External	Open	Open	Closed

DSR/DTR
Setting	SW1/S7
» Power ON	On
DSR follows DTR	Off

PARITY - ON/OFF
Setting	SW1/S3
» Enabled	On
Disabled	Off

PARITY - EVEN/ODD
Setting	SW1/S4
» Even	On
Odd	Off

REMOTE LOOPBACK
Setting	JP3
» Enabled	Pins 2 & 3 closed
Disabled	Pins 1 & 2 closed

STOP BIT
Setting	SW1/S5
» 1 stop bit	On
2 stop bit	Off

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
PWR	Green	On	Power is on
PWR	Green	Off	Power is off
RTS	Yellow	On	Request to Send enabled
RTS	Yellow	Off	Request to Send disabled
TD	Yellow	On	Modem is transmitting steady SPACE
TD	Yellow	Off	Modem is not transmitting data
TD	Yellow	Blinking	Modem is transmitting data
RD	Yellow	On	Modem is receiving steady SPACE
RD	Yellow	Off	Modem is not receiving data
RD	Yellow	Blinking	Modem is receiving data
DCD	Yellow	On	Carrier signal detected
DCD	Yellow	Off	Carrier signal not detected
LOS	Red	On	Loss of synchronization
LOS	Red	Off	Synchronization ‘OK’
ERR	Red	On	Errors in test pattern
ERR	Red	Off	Good test pattern
TEST	Yellow	On	Modem in test mode
TEST	Yellow	Off	Modem not in test mode