7
FASTCOM: ESCC-PCI-335
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
17
18
19
GND
RT-
DSR
RD+
CTS-
ST+
DCD-
SD+
RTS-
20
21
22
23
24
25
RT+
RD-
CTS+
ST-
DCD+
SD-
RTS+
TT-
9
TT+
DTR
GND
GND
DB25 CABLE CONNECTOR
DESCRIPTION (RS-530 pin out)
PIN DESCRIPTIONS
PIN#
DESCRIPTION
422 TYPE
CONNECTED TO
530 CIRCUIT
1
SHIELD/GROUND
GND
7
SIGNAL/GROUND
GND
AB
2
TRANSMIT DATA
A
SD-
BA
14
TRANSMIT DATA
B
SD+
BA
3
RECEIVE DATA
A
RD-
BB
16
RECEIVE DATA
B
RD+
BB
4
REQUEST TO SEND
A
RTS-
CA
19
REQUEST TO SEND
B
RTS+
CA
5
CLEAR TO SEND
A
CTS-
CB
13
CLEAR TO SEND
B
CTS+
CB
The RS-422 "A" side is 0 volts when a "1" is on the line (A side is the negative terminal of the 422 driver).
6
DATA SET READY
DSR
INPUT
20
DATA TERMINAL READY
DTR
OUTPUT
CLOCK SIGNALS
PIN# DESCRIPTION
422 TYPE CONNECTED TO 530 CIRCUIT
8
DATA CARRIER DETECT
A
DCD+
CF
10
DATA CARRIER DETECT
B
DCD-
CF
24
TRANSMIT CLOCK OUT
A
TT+
DA
11
TRANSMIT CLOCK OUT
B
TT-
DA
17
RECEIVE CLOCK IN
A
RT+
DD
9
RECEIVE CLOCK IN
B
RT-
DD
15
TRANSMIT CLOCK IN
A
ST+
DB
12
TRANSMIT CLOCK IN
B
ST-
DB
These are
opposite
of RS-422 in order to invert the signals going to the FASTCOM: ESCC-PCI-335. The 530
specification states that data is valid on the rising edge of the clock (0->1 transition), whereas the FASTCOM:
ESCC-PCI-335 clocks on the falling edge (1->0 transition). DCD is inverted because a "1" at DCD means active
to the FASTCOM: ESCC-PCI-335, but the 530 specification requires DCD to be "0" to be active.
On the same note, if you are using Clock Mode 1 and you are not using DCD, it must be strapped Active to allow
data reception.
NOTE: The DTR and DSR signals are single ended (unbalanced) as required by ANSI/EIA/TIA-530
specifications.
Summary of Contents for FASTCOM ESCC-PCI-335
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