Grass Valley VM 3000 System Controllers v.7.4 - Manual (Page 667)

F−1 VM 3000 Installation and Operating Manual
Appendix F
“ESbus” Specifications
MECHANICAL AND ELECTRICAL CHARACTERISTICS
Source: EBU tech. 3245−E, Remote−Control Systems for Television Equipment, December, 1984.
Figure F−1. Connector pin assignment.
FG
1
RC
6
RA
2
RB
7
TB
3
TA
8
TC
4
FG
9
SP
5
FG
1
TC
6
TA
2
TB
7
RB
3
RA
8
RC
4
FG
9
SP
5
Bus controller Tributary
FG Frame ground
TA Transmit “A”
TB Transmit “B”
TC Transmit−signal common
RA Receive “A”
RB Receive “B”
RC Receive−signal common
SP Spare
A < B ”MARK” state
A > B ”SPACE” state
G R
Generator
Balanced
Interconnecting
Cable Load
Receiver
R
t
+
−
1 = HI
0 = LO 1 = HI
0 = LO
B TB
A TA
C TC
RB B’
RA A’
RC C’
Cable
termination
Figure F−2. Balanced digi-
tal interface circuit.