C rs-530 signals and pin assignments – CANOGA PERKINS 2240 Fiber Optic Modem User Manual
Page 51
2240 Fiber Optic Modem
51
Table 4-C.
RS-530 Signals and
Pin Assignments
Two end-to-end control leads are provided as part of this interface. An input to
RTS (Request To Send) is transmitted to the DCD (Data Carrier Detect) output at
the other end of the link (refer to Sections 4.4.1, "RTS-Bias Jumper," and 4.4.2,
"DCD Jumper"). The factory setting (refer to Section 4.4.7, "CTS_OUT Jumper")
configures CTS as a local control. In this mode, CTS (Clear To Send) follows
RTS locally but is delayed approximately 1 millisecond when RTS turns ON (refer
to Section 4.4.6, "CTS_GATE Jumper"). Changing the CTS_OUT jumper enables
the second DTR to CTS control channel. In addition, the CTS (A) jumper allows
configuring the CTS(A) output lead for cryptography applications (refer to
Section 4.4.8, "CTS (A) Jumper").
#
Pin A/B
Signal Name
Direction
FG
01
Frame Ground
-
TD
02/14
Transmit Data
to modem
RD
03/16
Receive Data
from modem
RTS
04/19
Request to Send
to modem
CTS
05/13
Clear to Send
from modem
DSR
06/22
Data Set Ready
from modem
SG
07
Signal Ground
-
DCD
08/10
Data Carrier Detect
from modem
SCR
17/09
Receive Clock
from modem
SCT
15/12 *
Transmit Clock
to/from modem
SCTE
24/11
External Tx Clock
to modem
DTR
20/23
Data Terminal Ready
to modem
LL
18 **
Local Loopback
to modem
RL
21 **
Remote Loopback
to modem
TM
25
Test Mode
from modem
*
Becomes extra clock input if SCT switch is set to IN position.
**
These signals are single ended and activate a modem’s system test.
All other signals are balanced.