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C1645M-A (9/06) 19
Table B. Data Connector Pin Assignments
Pin Number RS-232 RS-422
RS-485
2-Wire
RS-485
4-Wire Manchester Bi-Phase
1 — TX+ (Out+) T+/R+ (Out+/In+) TX+ (Out+) — —
2 — TX- (Out-) T-/R- (Out-/In-) TX- (Out-) — —
3 — RX+ (In+) — RX+ (In+) RX+ (In+) (W) RX+ (In+)
4 — RX- (In-) — RX- (In-) RX- (In-) (B) RX- (In-)
5 RX (In) — — — — —
6 TX (Out) — — — — —
7 — — — — TX+ (Out+) (W) TX+ (Out+)
8 — — — — TX- (Out-) (B) TX- (Out-)
9 Ground —* —* —* Shield Shield
*Ground may be required based on conditions of installation. Refer to the current version of
EIA/TIA-422 and EIA/TIA-485 standards for additional information.
NOTES:
• RX (In), RX+ (In+), RX- (In-), R+ (In+), and R- (In-) denote data input to the transmitter/
receiver.
• TX (Out), TX+ (Out+), TX- (Out-), T+ (Out+), and T- (Out-) denote data output from the
transmitter/receiver.
• W denotes white wire, and B denotes black wire.
• Data ports are not terminated. For RS-422, RS-485 2-wire, RS-485 4-wire, Manchester, and
Bi-Phase data signals, termination may be required based on conditions of installation.
If termination is required, terminate the data signal at the endpoint of the data bus using a
120-ohm resistor.
C1645M-A.book Page 19 Wednesday, September 13, 2006 3:07 PM