CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 61)

2240 Fiber Optic Modem
61
4.6.1.1 RS-449 / DC-37 Interface
This interface complies with EIA Standard RS-449. Electrical characteristics comply
with RS-422 for clock and data signals and RS-423 for control signals. The interface
uses the physical connector type and pinouts specified in RS-449 (refer to Table 4-H).
The RS-449 / 422 interface uses a 37-pin, female D-Type connector for the physical
connection.
Table 4-H.
RS-449 Pinouts
for Model MC1
Pin RS-449 Direction
Number Pin Name
A/B (abbrev) (full name)
1 SHLD shield -
4/22 SD send data to modem
5/23 ST send timing from modem
6/24 RD receive data from modem
7/25 RS request to send to modem
8/26 RT receive timing from modem
9/27 CS clear to send from modem
10 LL local loopback to modem
11/29 DM data mode from modem
12/30 TR terminal ready to modem
13/31 RR receiver ready from modem
14 RL remote loopback to modem
15 IC incoming call from modem
17/35 TT terminal timing to modem
18 TM test mode from modem
19 SG signal ground -
20 RC receive common -
37 SC send common to modem
2/36 N/A extra clock for to modem
receive data