CANOGA PERKINS 2270 Fiber Optic Modem - Manual (Page 28)

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Canoga Perkins
3.5 RS-530 Interface Model -R30
The EIA RS-530 interface uses RS-422 (balanced) electrical signals for all interface circuits (data,
clock and control), except for the loopback (local/remote), and test mode pins which use RS-423
(unbalanced bipolar) electrical signals. The DB-25 pin assignments and signals supported are
detailed in Table 3-F. Jumper options are detailed in Table 3-G.
Normally, the control leads RTS, CTS, DSR and TM are supported locally (i.e., no end-to-end
connectivity). RTS can be used to control DCD at the far-end if the 2270 is set for flow control.
NOTE: DTR to RI is not supported on the 2270.
A 3.5 mm stereo phone jack is provided for an alarm contact output for 2270 applications. This
contact is controlled by the presence of CD (Optical Receive Carrier Detect). If CD is not valid or
power is lost, the relay is in the alarm state. A jumper (RLY) controls the selection of either the
open or closed state. This is a three-contact jack. The alarm circuit is present between the tip and
sleeve contacts. The contact rating is 24VAC or 24VDC at 0.5A.
Table 3-F. RS-530 Signals and Pin Assignments
Pin # 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 from modem
SCTE 24/11 External Tx Clock to modem
DTR 20/23 Data Terminal Ready to modem
LL 18* Local Loopback Loopback
RL 21* Remote Loopback Loopback
TM 25 Test Mode from modem
* These signals are single ended and activate a modem's system
test. All other signals are balanced.